Year-End Tax Planning Strategies for December [2025 Guide]

[Last Updated on 4 weeks ago]

Why December 2025 is a Critical Window for Tax Strategy?

December isn’t just the final month of the year — it’s a power window for high-impact tax moves. The actions taken now directly shape how much you owe, how much you can save, and how efficiently your finances flow into the next year. From adjusting income timing to finalizing retirement contributions, every decision made this month locks in your 2025 tax footprint.

But this year isn’t like previous ones. The One Big Beautiful Bill Act (OBBBA) — signed into law earlier this year — brought the most sweeping tax changes since the TCJA. From restructured itemized deduction limits to expanded bonus depreciation and new individual write-offs, 2025 is a unique tax year that demands proactive planning.

If you’re a CPA, tax advisor, or proactive business owner, December is your deadline to:

• Recalculate your adjusted gross income (AGI) under new rules
• Leverage fresh deductions and credits while they’re still effective
• Optimize year-end documentation and compliance workflows using automation
• Prepare for 2026 by locking in moves that impact multi-year tax positioning

This year-end guide is your execution manual. It focuses on tactical December decisions, powered by CPA Pilot workflows and tailored for real-world compliance and advisory planning. Whether you’re optimizing for individual clients, pass-through businesses, or estate-level structures, every section is engineered to save time and maximize after-tax outcomes.

What Changed in 2025 That Affects Year-End Tax Planning?

Before making year-end moves, it’s essential to understand how 2025 tax law changes — especially those introduced under the One Big Beautiful Bill Act (OBBBA) — reshape the planning landscape. These changes affect deductions, credits, depreciation, income thresholds, and compliance rules across individuals and businesses.

Here are the most impactful legislative shifts to factor into your December decisions:

1. Expanded Itemized Deductions & SALT Cap Changes

• Beginning in 2025, the State and Local Tax (SALT) deduction cap increases from $10,000 to $40,000 for most filers (including joint), and $20,000 for married filing separately, with income‑based phase‑downs and scheduled changes after 2029.
• Mortgage interest deduction rules now accommodate secondary residences (up to adjusted limits).
• OBBBA’s headline changes do not establish a new universal 5% of AGI medical threshold.

Implication: Reassess whether itemizing beats the standard deduction under new thresholds, especially when bunching charitable donations.

2. New Individual Deductions for Working Families

OBBBA introduces new above‑the‑line deductions for qualified tips and qualified overtime compensation, with specific dollar caps and AGI phaseouts, generally available for multiple years (e.g., 2025–2028), not only through 2025.

There is no broad vehicle‑loan‑interest above‑the‑line deduction matching the draft description. 

3. Permanent Bonus Depreciation at 100%

OBBBA effectively restores 100% bonus depreciation for qualifying property, including used property, but 2025 includes transition rules (older acquisitions may be at 40% bonus; later 2025 property can qualify for 100%).

The planning takeaway is still to ensure qualifying assets are acquired and placed in service under the new 100% rules, but avoid implying that every 2025 acquisition automatically gets 100% without regard to timing. 

4. Changes to the Qualified Business Income (QBI) Deduction

• QBI thresholds have been expanded and phaseout limits revised.
• OBBBA expands QBI thresholds and clarifies how some SSTBs qualify; advisors should review updated SSTB rules and thresholds for each client.

Implication: Review S-Corp reasonable compensation structures and pass-through earnings now to stay inside deduction eligibility zones.

5. Credit Expansions & Phaseouts

• OBBBA increases the Child Tax Credit and adjusts refundability and phaseout thresholds for 2025 and later years; check current IRS tables for the exact amount applicable to your filing status and year.
• Dependent Care Credit now includes higher income phaseouts.
• New clean energy and hiring-related business credits introduced with sunset triggers starting in 2026.

Implication: If you’re advising clients with children, dependents, or workforce expansion plans, now is the window to qualify under peak credit conditions.

6. Compliance & Reporting Revisions

• New e-filing thresholds and penalties for late estimated payments
• Under OBBBA, the 1099‑K threshold is restored to its pre‑American Rescue Plan level: $20,000 in total payments and more than 200 transactions, retroactive to earlier years and applicable to 2025. The planned $5,000 and then $600 thresholds are specifically reversed. ​
• Higher scrutiny for multi-jurisdictional income and residency claims

Implication: Ensure year-end checklists include updated reporting thresholds and electronic filing reviews.

By embedding these legislative changes early in your planning, you avoid misaligned assumptions and position clients for maximum tax efficiency under 2025 rules. These updates will directly influence the tactics outlined in the sections that follow.

2025 Year-End Tax Deadlines and Compliance Calendar

Don’t Miss These Key Tax Deadlines in December 2025

Year-end tax planning isn’t just about strategy — it’s about timing. Missing a key deadline can lead to penalties, disqualified deductions, or missed credits. Use this compliance calendar to keep clients or your business aligned with critical due dates.

Top Individual Deadlines Before December 31, 2025

Deadline	Task
Dec 31	Last day to take Required Minimum Distributions (RMDs) from IRAs and 401(k)s
Dec 31	Final day to complete Roth IRA conversions for 2025
Dec 31	Deadline for charitable contributions to count for 2025
Dec 31	Deadline to realize capital gains or losses (harvesting)
Dec 31	Last day to use Flexible Spending Accounts (FSAs) funds (unless grace period applies)
Dec 31	Complete income deferral or acceleration planning

Tip: Encourage clients to act by mid-December to avoid processing delays and custodian cutoff dates.

Key Business & Payroll Compliance Dates

Deadline	Business Task
Dec 15	Final payroll runs for year-end bonuses and compensation planning
Dec 31	Execute equipment purchases for bonus depreciation or §179 expensing
Dec 31	Last day to complete owner draws/distributions affecting 2025 income
Jan 15, 2026	Q4 estimated tax payment deadline for businesses and self-employed
Jan 31, 2026	Deadline to issue W-2s and 1099s to employees/contractors
Feb 28 / Mar 31, 2026	File information returns with IRS (paper/e-file deadlines)

Tip: Document asset purchases, QBI-affecting distributions, and payroll tax filings to support deductions under IRS audit review.

Trusts, Estates, and High-Income Individuals

Deadline	Estate/Trust Compliance
Dec 31	Distribute income to beneficiaries to avoid trust-level taxation
Dec 31	Finalize gifting strategies under annual exclusion limits
Dec 31	Consider Generation-Skipping Transfer (GST) allocations if applicable
Jan 15, 2026	Final estimated tax payment deadline for complex trusts
March 6, 2026	Form 1041 deadline (with extension)

Final Compliance Tips

• Review multi-state residency status and finalize domicile records for 2025.
• Prepare CPA Pilot automation workflows for W-2/1099 issuance and RMD tracking.
• Confirm custodian processing timelines (some close RMD/Roth processing by Dec 22–27).
• Document everything — logs, confirmations, timestamps — to ensure defensibility.

Baseline Your Tax Plan in 5 Minutes

Start With a High-Level Tax Snapshot

Before diving into tax-saving strategies, take 5 minutes to establish a real-time baseline of your 2025 financial position. This simple but critical step ensures every subsequent move — from deductions to Roth conversions — is contextualized to your actual tax profile.

Step 1: Pull Your Year-to-Date (YTD) Income & Expense Data

Use accounting software, bank exports, payroll records, and brokerage statements to capture:

• Wages, bonuses, and freelance income
• Capital gains and investment income
• Rental income, royalties, and K-1 earnings
• Business expenses, estimated tax payments, charitable donations

Pro Tip: If you’re using CPA Pilot, import data feeds and initiate automated YTD roll-ups in less than 2 minutes.

Step 2: Estimate Your Adjusted Gross Income (AGI)

Estimate 2025 AGI by subtracting:

• Traditional IRA or HSA contributions
• Self-employed retirement contributions
• Educator expenses or student loan interest
• New 2025 deductions (tips, overtime)

Why it matters: AGI affects phaseouts for dozens of credits, deductions, and even Medicare premiums in 2026.

Step 3: Check Your Alternative Minimum Tax (AMT) Exposure

Many upper-middle-income taxpayers face Alternative Minimum Tax (AMT) due to:

• Incentive stock option exercises
• High SALT deductions
• Depreciation adjustments on passive real estate

Use an AMT calculator or CPA Pilot’s “What-If” module to assess risk — especially before triggering any large year-end events.

Step 4: Project Net Investment Income Tax (NIIT) Position

If your modified AGI exceeds:

• $200,000 (single)
• $250,000 (married joint)
  You may owe an extra 3.8% Net Investment Income Tax (NIIT) on investment income. Planning moves like Roth conversions or capital gain harvesting should factor this threshold.

Step 5: Run a Pro-Forma Return (or Ask AI to Help)

Model your projected return using a trusted tool — ideally:

• Tax prep software (ProConnect, UltraTax, etc.)
• CPA Pilot’s 1040 preview with tax bracket overlays
• AI Tax Assistants (like CPA Pilot)

Decision-making improves drastically when you know your likely marginal rate. This also tells you where to time income, when to accelerate deductions, and whether Roth conversions make sense.

How to Harvest Capital Losses Without Wash Sale Violations

Use Strategic Loss Harvesting to Offset 2025 Capital Gains

Capital loss harvesting remains one of the simplest, fastest ways to reduce your 2025 tax bill — but only if you follow the rules and avoid wash sale traps.

When executed correctly in December, loss harvesting lets you:

• Offset capital gains on winning investments
• Apply up to $3,000 in net losses against ordinary income
• Carry forward unused losses to offset future gains indefinitely

Step 1: Identify Taxable Accounts With Realized Gains

Check your brokerage and crypto wallets for assets sold at a profit earlier this year. Look for:

• Equities or ETFs with short- or long-term gains
• Mutual fund capital gain distributions
• Cryptocurrency transactions (including NFTs)
• Real estate investment trusts (REITs) in taxable accounts

Tip: Losses are first used against gains of the same type (short-term with short-term, long-term with long-term).

Step 2: Harvest Strategic Offsetting Losses

Sell investments currently trading at a loss to create capital offsets:

• Focus on underperformers unlikely to rebound before year-end
• Consider paired sales (e.g., sell VTI, buy SCHB) to maintain asset class exposure without wash sale violations
• If you’re over the NIIT threshold, every dollar of capital loss may also eliminate 3.8% surtax exposure

Use tax-loss harvesting dashboards or CPA Pilot integrations to sort positions by unrealized loss size and holding period.

Step 3: Understand and Avoid the Wash Sale Rule

The wash sale rule disallows the deduction of a loss if you buy a “substantially identical” investment:

• Within 30 days before or after the sale
• Across any of your accounts (including IRAs, 401(k)s, HSAs)
• Even if your spouse or entity-controlled account makes the buyback

Examples of potential wash sales:

• Sell VOO on Dec 20, rebuy on Dec 24 — disallowed
• Sell TSLA in a taxable account, rebuy in your Roth IRA — disallowed
• Sell a mutual fund and reinvest in the same fund class via dividend reinvestment — disallowed

Solution: Use similar but not identical tickers to stay in the market (e.g., sell SPY, buy IVV). Track all trades with wash sale monitoring tools.

Step 4: Record and Apply Losses Properly

Capital losses are reported on Schedule D of your Form 1040. Ensure:

• Losses are categorized properly (short vs. long term)
• Basis is correctly calculated (adjusted for prior wash sales)
• Any carryforward from previous years is factored into your 2025 tax modeling

Tip: Automate this process using CPA Pilot’s gain/loss harvesting module — integrates with major brokerages and flags wash sale risks in real time.

Time Income and Deductions for Maximum Benefit

Align Income and Deduction Timing With 2025 Law Changes

One of the most powerful levers in year-end tax planning is timing — deciding whether to shift income or expenses into this year or defer them into 2026. Thanks to expanded deduction limits and new above-the-line deductions introduced under the One Big Beautiful Bill Act (OBBBA), 2025 offers rare flexibility to optimize cash flows and reduce your overall tax burden.

When to Accelerate Deductions

You may want to pull forward deductible expenses into 2025 if:

• You’re close to itemizing under the new, higher SALT and mortgage deduction thresholds
• You’ve had unusually high income in 2025 and want to reduce your AGI now
• You expect lower income (and a lower tax bracket) in 2026

Common deductions to accelerate:

• Charitable giving (including Donor-Advised Funds)
• Medical expenses remain deductible only to the extent they exceed 7.5% of AGI, subject to itemizing and the usual documentation rules.
• State and local taxes (SALT) if not capped
• Business expenses (for sole props or S-corps)

Strategy Tip: Consider bunching — combining multiple years’ worth of deductions into 2025 to surpass the standard deduction threshold.

When to Defer Income

Pushing income into 2026 might be ideal if:

• Your 2025 income puts you into a higher marginal tax bracket
• You’re on the edge of phaseouts for credits like the Child Tax Credit or QBI deduction
• You expect new deductions or rate relief in 2026

Types of income that can often be deferred:

• End-of-year bonuses or contractor invoices
• Capital gains on appreciated assets
• IRA distributions (for clients younger than 73)
• Business revenue through invoicing delays or expense acceleration

Pro Tip: Use CPA Pilot’s cash flow timing simulator to model AGI shifts and deduction trade-offs based on income deferral scenarios.

Coordinate With AMT, NIIT, and AGI Thresholds

Before timing anything, remember that some strategies can backfire if they:

• Increase exposure to Alternative Minimum Tax (AMT)
• Trigger Net Investment Income Tax (NIIT) above $200k/$250k
• Push you past deduction phaseouts or Medicare premium thresholds

Use pro forma returns or CPA Pilot’s AGI sensitivity module to test outcomes before finalizing moves.

Real-World Examples

Scenario	Suggested Action
High earner with large RSU vesting in 2025	Bunch charitable deductions into 2025
Freelancer invoicing in December	Defer billing to January to reduce 2025 income
Client had major surgery	Pre-pay all deductible medical expenses by Dec 31
Married couple close to SALT cap	Accelerate state tax payments if cap not yet reached

✅ Outcome: Optimized AGI, Bracket Positioning, and Deduction Use

With 2025’s enhanced deduction limits and income thresholds, timing decisions have never mattered more. Use this month to fine-tune your income and expense flow — and lock in the most favorable tax treatment before Dec 31.

Year-End Retirement Tax Moves to Make Before December 31

December 31 is a Hard Deadline for Key Retirement Actions

If you’re managing retirement accounts — whether for yourself or advising clients — December is your final window to execute critical tax moves that can influence bracket placement, Medicare premiums, and lifetime tax burdens. Thanks to 2025’s tax law updates under the One Big Beautiful Bill Act (OBBBA), new contribution limits and deduction dynamics make year-end timing more strategic than ever.

1. Take Required Minimum Distributions (RMDs) if Applicable

If you’re 73 or older, you must withdraw at least your Required Minimum Distributions (RMDs) by December 31 to avoid a steep 25–50% IRS penalty.

Key notes:

• Applies to IRAs, 401(k)s, and other qualified plans
• Roth IRAs are exempt (unless inherited)
• Aggregation rules apply — but 401(k) RMDs must be taken from each plan separately
• For inherited IRAs (10-year rule), withdrawals may still be required in 2025 under IRS transition guidance

Use CPA Pilot’s RMD calculator to automate distribution estimates and custodian communication deadlines.

2. Consider a Roth IRA Conversion Before Year-End

A Roth conversion shifts funds from a pre-tax retirement account (like a traditional IRA) into a Roth, triggering income tax now in exchange for future tax-free growth and withdrawals.

Why 2025 is a compelling year:

• Marginal tax brackets remain relatively low (pending future rate hikes)
• Roth income isn’t subject to RMDs, offering future flexibility
• 2025’s AGI thresholds allow precise targeting to avoid phaseouts and AMT triggers

Run a partial Roth conversion to stay under your current bracket cap or under the NIIT threshold.

Use CPA Pilot’s Roth optimizer to simulate multiple conversion scenarios and bracket overflow impacts.

3. Maximize Retirement Contributions (if Still Eligible)

Contributions for 2025 must typically be made by April 15, 2026 — but employer plan deferrals often close by December 31.

Contribution limits:

• 401(k): Up to $23,000 (+$7,500 catch-up if over 50)
• IRA/Roth IRA: Up to $7,000 (+$1,000 catch-up)
• Solo 401(k) or SEP IRA: Up to 25% of compensation, with absolute limits up to $69,000

• Prioritize pre-tax contributions if your AGI is high this year
• Use Roth options if income is low and you’re building tax-free buckets

4. Avoid Common Retirement Planning Mistakes

Tip: Document all retirement moves in CPA Pilot and include a retirement-specific compliance checklist.

✅ Outcome: Lower Lifetime Tax Burden & Increased Distribution Flexibility

Retirement planning in December isn’t just about this year’s taxes — it’s about controlling how and when you’ll pay taxes for decades to come. Strategic RMDs, Roth conversions, and contribution timing allow you to lock in flexibility and reduce tax drag well beyond 2025.

Year-End Tax Planning for S-Corps, LLCs, and Sole Proprietors

Business Owners Have the Most to Gain — or Lose — in December

If you operate an S-Corporation, LLC, or sole proprietorship, your year-end tax moves directly affect your 2025 tax liability, income qualification for credits, and long-term business cash flow. The One Big Beautiful Bill Act (OBBBA) made several permanent and expanded changes to depreciation, income thresholds, and pass-through deduction mechanics — giving business owners a unique planning window before December 31.

1. Maximize Section 179 Expensing & Bonus Depreciation

Under the new law:

• OBBBA and inflation adjustments do raise §179 limits, but the exact 2025 thresholds must be taken from current IRS guidance. [Source]
• Bonus depreciation is permanently set at 100% for both new and used property
• Applies to machinery, equipment, off-the-shelf software, and qualified real estate improvements

Execution Tip: Make qualified purchases and place them in service by Dec 31 to take full deductions on your 2025 return.

Use CPA Pilot’s expensing module to prioritize asset write-offs that reduce taxable business income while preserving AMT protection.

2. Fine-Tune S-Corp Officer Compensation

For S-Corp owners:

• IRS requires a reasonable salary before distributions are taken
• Excess salary reduces QBI eligibility, while underpayment triggers audits

Perform a compensation benchmark before year-end to strike the ideal balance:

• Satisfy IRS “reasonable compensation” tests
• Maximize QBI deduction eligibility under updated phaseout thresholds
• Avoid triggering NIIT or self-employment tax adjustments

3. Lock in QBI Deduction Eligibility (IRC §199A)

The Qualified Business Income deduction (QBI) remains one of the most valuable deductions for pass-throughs.

For 2025:

• Income limits have increased under OBBBA
• SSTBs (Specified Service Trades or Businesses) have extended safe harbors through 2026
• QBI is calculated after W-2 wages and capital basis tests

Strategies:

• Consider making retirement plan contributions to reduce taxable income into QBI range
• Ensure proper entity-level bookkeeping to track QBI-eligible income and expenses
• Review W-2 to income ratio to avoid partial deduction phaseout

4. Prepay Deductible Expenses and Defer Income

Use cash-basis timing to shift your taxable position:

• Prepay rent, software, subscriptions, or vendor contracts before Dec 31
• Delay invoicing or revenue collection until January (if cash method applies)
• Finalize client bonuses or owner draws now to impact 2025 net income

Use CPA Pilot’s cash vs. accrual simulation tools to see how timing shifts impact AGI and QBI.

5. Evaluate Business Structure and State Nexus

• With more states revising SALT cap workaround regimes and OBBBA’s impact on pass-through taxation, review whether your current structure still serves you
• Consider electing into entity-level state tax payments if beneficial
• Reevaluate nexus exposure across states where services or deliveries occurred in 2025

Tip: December is the best time to file entity classification elections (Form 8832 or 2553) for the coming year.

✅ Outcome: Lower Taxable Business Income, Preserved Deductions, Reduced Audit Risk

With §179 expensing, QBI thresholds, and payroll-based deductions all affected by OBBBA, business owners who plan in December can control thousands — or tens of thousands — in tax exposure. Use every remaining day of 2025 to optimize entity flows, equipment timing, and distribution strategy.

How High Earners Should Optimize Equity and Income in December?

Wealth Accumulators Face Unique Year-End Triggers

If you’re a high-earner with stock options, RSUs, crypto, or complex investment structures, December is a critical moment to optimize equity compensation, unlock tax-efficient giving, and manage AGI-sensitive thresholds. In 2025, the OBBBA’s expanded phaseouts, deduction rules, and surtax triggers make planning even more precise — and mistakes more costly.

1. Review RSU Vesting and Year-End Value Impact

Restricted Stock Units (RSUs) create taxable ordinary income on vesting, not exercise. December RSU vestings can:

• Increase W-2 wages and AGI
• Trigger NIIT and Medicare surtaxes
• Reduce eligibility for credits or Roth IRA contributions

Action Step:

• Use employer equity dashboards to review vesting schedules through Dec 31
• Coordinate with your CPA to withhold or offset excess income using charitable giving or bonus deferrals

2. Exercise Stock Options Strategically (Especially ISOs)

Incentive Stock Options (ISOs) carry Alternative Minimum Tax (AMT) consequences if exercised and held.

Key 2025 considerations:

• AMT exemption amounts expanded slightly under OBBBA, but early exercises can still create large AMT hits
• Exercising and holding stock beyond the 1-year holding period converts gains to long-term capital gains — but that holding period must start before Dec 31

Run a Black-Scholes + AMT model using CPA Pilot or similar tools to weigh risk vs. gain before executing.

3. Unlock Charitable Giving Vehicles for Tax Efficiency

High-net-worth individuals benefit most from non-cash charitable giving, especially:

• Appreciated stock (no capital gains tax + full FMV deduction)
• Crypto donations (direct to donor-advised funds or 501(c)(3)s)
• Donor-Advised Fund (DAF) contributions for 2025 deduction with multi-year giving control

Bunch into 2025 if:

• You’re over the itemized deduction threshold
• You had high capital gains this year
• Your RSU/option activity significantly increased taxable income

4. Realign Portfolio Tax Exposure

For individuals with large taxable portfolios or alternative investments:

• Rebalance to lock in tax loss harvesting
• Prepare to offset any RSU/option or private equity income events
• Review fund distributions from mutual funds or REITs in December (they can carry phantom income)

Tip: Consider allocating income-producing assets to qualified retirement accounts and growth-oriented investments to taxable accounts.

5. AGI Management for 2026 Planning

Many high-net-worth decisions now affect:

• IRMAA (Medicare Part B & D premiums) in 2027
• Phaseouts for child tax credits or dependent deductions
• Eligibility for new above-the-line deductions (tips, overtime, etc.) under 2025 law

Use CPA Pilot’s AGI simulator to “drag and drop” event-based income into future years to see ripple effects.

✅ Outcome: High-Control, High-Impact Tax Positioning for Complex Income Profiles

In the world of equity comp, trusts, and advanced investment exposure, December isn’t optional — it’s a non-negotiable tax reset window. Proactive timing and repositioning can result in 5–6 figure savings and smoother compliance downstream.

Maximize 2025 Charitable Deductions with DAFs and Smart Giving

Optimize Giving Before December 31 to Lock In 2025 Tax Benefits

Charitable giving isn’t just good for causes you care about — it’s a powerful tool for reducing taxable income, especially in a high-income year or when facing large capital gains. The One Big Beautiful Bill Act (OBBBA) has made giving more attractive in 2025 by expanding deduction thresholds and offering greater flexibility on donation types.

But to get the full tax advantage, you must complete your giving by December 31 — and choose the right giving vehicle.

1. Use Donor-Advised Funds (DAFs) for Flexible Deduction Timing

DAFs allow you to:

• Make a single, large donation in 2025 (and deduct it this year)
• Distribute funds to charities later over months or years
• Simplify donation tracking and recordkeeping

Great for bunching: Combine 2–3 years of giving into one 2025 deduction to exceed the standard deduction and unlock itemized return advantages.

Bonus: DAFs accept appreciated stock, crypto, or private equity in many cases — enabling non-cash giving with maximum deduction value.

2. Donate Appreciated Assets to Avoid Capital Gains Tax

Instead of donating cash:

• Gift appreciated stock, ETFs, or mutual funds held for more than a year
• Avoid the capital gains tax you’d pay if you sold
• Receive a full fair market value deduction (up to 30% of AGI)

Use this if:

• You have large unrealized gains
• You’re facing AMT or NIIT exposure
• You’ve already maxed out your SALT or standard deduction amounts

3. Make Direct Cash Donations for Up to 60% AGI Deduction

If you prefer giving cash:

• You can deduct up to 60% of AGI in qualified charitable contributions
• Eligible donations must go to qualified 501(c)(3) organizations
• Always obtain contemporaneous written acknowledgments for gifts ≥ $250

Cash giving is more favorable than in pre-OBBBA years due to restored and expanded AGI limits.

4. Consider Qualified Charitable Distributions (QCDs) from IRAs

If you’re age 70½ or older:

• You can donate up to $100,000 directly from your IRA to a charity
• The QCD does not count as income and satisfies RMD requirements

This is one of the few above-the-line strategies available to retirees not itemizing deductions.

5. Align Charitable Giving With Strategic Tax Positioning

Combine giving with:

• Capital gain harvesting (offset realized gains)
• Roth conversion planning (reduce income spike impact)
• Trust or estate planning (optimize income distributions with philanthropic intent)
• Use CPA Pilot’s “Giving Optimization Workflow” to model charitable deduction stacking, QCD eligibility, and DAF impact in real time.

✅ Outcome: Charitable Impact + High-Efficiency Deduction Use

Smart giving strategies let you lower your AGI, reduce capital gains taxes, and support causes you care about — all before December 31. Whether via a Donor-Advised Fund, appreciated stock, or IRA QCD, December is the last stop for 2025 tax-advantaged generosity.

Year-End Real Estate Tax Deductions and Depreciation Strategies

Year-End is the Best Time to Boost Real Estate Deductions

Whether you’re a real estate investor or a business owner with property on the books, December 2025 is your last chance to accelerate real estate deductions under favorable rules. Thanks to the One Big Beautiful Bill Act (OBBBA), 2025 maintains full 100% bonus depreciation, expanded §179 expensing, and favorable cost segregation dynamics — but proper timing is critical.

1. Take Full Advantage of 100% Bonus Depreciation in 2025

For eligible commercial and residential real estate assets:

• Bonus depreciation is available at 100% for qualified property placed in service by December 31, 2025
• Applies to:
  • Furniture, appliances, and fixtures
  • HVAC systems and roofing
  • Leasehold improvements and modular buildouts
  • Land improvements (e.g., paving, landscaping)

Key Rule: The asset must be both purchased and placed in service by year-end — mere purchase orders don’t count.

Use CPA Pilot’s depreciation planner to verify placed-in-service status and remaining basis allocations.

2. Conduct a Cost Segregation Study to Accelerate Deductions

Cost segregation allows you to:

• Break out real estate components into 5-, 7-, and 15-year property categories
• Accelerate depreciation instead of using a 27.5- or 39-year straight-line schedule
• Create immediate deductions of $50,000–$500,000+ depending on property size

Best for:

• Properties acquired or improved in 2025
• Short-term rental (STR) properties or multifamily acquisitions
• Business owners with leased commercial spaces

Tip: Even existing properties can be reclassified using look-back studies, triggering a catch-up deduction (Form 3115) without amending past returns.

3. Leverage §179 Expensing for Qualifying Real Estate Assets

In 2025:

• You can expense up to $1.3 million of qualifying real estate-related assets
• Includes roofs, HVACs, alarm systems, fire protection — previously ineligible under old rules
• Ideal for owner-operators or S-corps with capital-intensive locations

Compare §179 vs. bonus depreciation based on:

• Current income level (since §179 is limited by taxable income)
• AMT exposure (bonus depreciation may trigger AMT adjustments)

4. Realign Real Estate With Passive Activity Rules

If you’re a passive investor, ensure:

• You have enough passive income to absorb deductions
• You’re not triggering suspended losses unnecessarily
• Consider grouping elections or real estate professional status to offset active income

Run a passive loss utilization scenario with CPA Pilot to identify where loss timing can be synchronized with income flows.

 ✅ Outcome: Maximize Real Estate Write-Offs Without Triggering Red Flags

By cleaning up depreciation schedules, leveraging cost segregation, and properly placing property in service, you unlock immediate and sizable deductions while remaining fully compliant. With 100% bonus depreciation slated for future phase-down, 2025 is the most aggressive year to execute these strategies.

How to Finalize Multistate Residency and Income Reporting for 2025

Before December 31, Lock Down Your Residency & State Tax Position

If you’ve lived, worked, owned property, or conducted business in multiple states during 2025, you may be facing multistate tax exposure. With more states using aggressive nexus rules and audit triggers, now is the time to finalize your residency footprint, close state tax gaps, and document intent before the year closes.

1. Confirm Domicile vs. Statutory Residency

States evaluate where you intend to live (domicile) versus where you actually spent time (statutory residency).

Common state residency audit triggers:

• Spending more than 183 days in the state
• Owning a primary or vacation home there
• Having family, driver’s licenses, and bank accounts based in-state
• Using in-state healthcare or school systems

Use a residency log or GPS tracker app to substantiate physical presence in your intended domicile state.

Tip: New York, California, Massachusetts, and Illinois are especially aggressive in asserting tax residency.

2. Review State Source Income

Even if you’re not a resident, you may owe nonresident tax if you:

• Worked in the state (remotely or in-person)
• Own rental property generating income
• Have a business with sales or services in that state
• Realized capital gains from real estate or partnerships domiciled there

States like California, Oregon, and New Jersey aggressively tax source-based income — ensure you file nonresident returns where needed.

3. Verify State Withholding and Estimated Payments

To avoid underpayment penalties:

• Check that state tax withholdings match income allocation
• Make final estimated payments by January 15, 2026
• Adjust payroll and investment account settings to reflect true residency going forward

For remote workers and digital nomads: coordinate with employers or HR to correct state sourcing codes before year-end.

4. Consider Making a Year-End Residency Declaration

To support a change of domicile or residency position:

• Update voter registration, driver’s license, and legal address
• Move primary belongings and records to new state
• Maintain a detailed log of travel, bills, and medical care usage
• Prepare a domicile affidavit or intent letter if relocating in December

Use CPA Pilot’s Residency Audit Defense Template to create documentation kits in case of future challenge.

5. Plan for 2026 State Tax Impact

2025 moves may impact:

• State AMT or credit carryforwards
• Nexus exposure from digital business activities
• Multistate partnership K-1 allocations
• SALT cap workaround elections (entity-level taxes)

Meet with a multistate tax specialist or use CPA Pilot’s “state exposure simulation” to model potential 2026 liabilities.

✅ Outcome: Avoid Penalties, Reduce Audit Risk, and Secure Tax Residency

Multistate tax errors are among the most expensive to fix retroactively. December 2025 is your deadline to finalize residency intent, clean up sourcing conflicts, and prevent costly dual-taxation problems next year.

Final Year-End Compliance Checklist Using CPA Pilot

With the expanded 2025 tax rules under the One Big Beautiful Bill Act (OBBBA) and the complexity of modern income profiles — your December planning window is your best opportunity to influence your lifetime tax burden.

Whether you’re managing equity comp, business deductions, multistate income, or passive real estate — now is the time to execute. Use this playbook to baseline fast, time income/deductions, harvest with guardrails, tune QBI/§179/bonus, and button up equity comp, charity, real estate, and multistate.

CPA Pilot makes it simple—baseline in minutes, auto-generate tasks and evidence packs, and reduce review churn. For pitfalls to avoid, see Year-End Tax Research Mistakes.

Make sure to download the checklist for client-facing tasks and prompts for automated assistance within CPA Pilot.

Year-end Tax Planning FAQs

How does AI improve year-end tax planning accuracy?

AI improves tax accuracy by analyzing real-time financial data with predictive modeling to flag deductions, detect compliance gaps, and optimize filing positions before deadlines.

What are the best AI tools for CPA tax workflows?

CPA Pilot and similar AI tax tools streamline compliance through automation of AGI projections, document generation, and scenario testing across client types.

How should digital assets be reported for 2025 taxes?

Report digital assets like crypto and NFTs under capital gains or income, depending on usage. Use AI tools to track basis, wash sales, and triggers before Dec 31.

What are 2025 estate tax planning strategies under OBBBA?

2025 estate tax strategies include maximizing annual gifting, using GST allocations, and timing trust distributions under new thresholds introduced by OBBBA.

How does December tax planning affect 2026 Medicare premiums?

2025 AGI impacts 2027 Medicare IRMAA brackets. Lower AGI now reduces future premiums, making Roth conversions and loss harvesting critical before year-end.

Disclaimer: This article is provided by CPA Pilot for educational purposes. While we may offer tax software/services, the information here is general and may not address your specific facts and circumstances. It does not constitute individual tax, legal, or accounting advice. U.S. federal and State Tax laws change frequently; please consult a qualified tax professional before acting on any information.