Tax Planning – Year-End Tax Planning Checklist

Year-end tax planning for 2025 demands immediate attention as multiple factors converge: strong market performance creating substantial capital gains, upcoming 2026 rule changes including a new 0.5% AGI floor for itemized deductions, and elevated estate tax exemptions reaching $13.99M for individuals before potential sunset provisions. Strategic action taken before December 31 can significantly reduce your 2025 tax liability while positioning you for optimal outcomes in the years ahead.

Key Takeaways

  • Prepare a pro forma 2025 tax return with your advisor to establish your baseline tax situation and identify opportunities for strategic reductions before year-end
  • Implement tax-loss harvesting and donate appreciated securities to offset capital gains from strong 2025 market performance while maximizing charitable deduction benefits
  • Maximize retirement contributions before December 31, including enhanced catch-up amounts of $34,750 for those aged 60-63 in employer-sponsored plans
  • Complete required minimum distributions by the December 31 deadline if you’re 73 or older to avoid steep 25% penalties on missed withdrawals
  • Leverage the 2025 lifetime gift exclusion of $13.99M per individual before new thresholds and potential legislative changes take effect in 2026

Establish Your 2025 Tax Baseline and Review Financial Activity

I can’t stress enough the importance of knowing exactly where you stand before the calendar flips. Working with your tax advisor to prepare a pro forma 2025 tax return gives you a clear picture of your current tax situation and reveals potential changes from additional income or deductions you may not have considered. This baseline becomes your roadmap for strategic decision-making in the final weeks of the year.

Request a year-to-date tax summary from your financial team that shows activity across all accounts, with particular attention to your adjusted gross income (AGI). Your AGI serves as the foundation for numerous tax calculations and threshold determinations. Gather income data from every source you can identify:

  • Wages and salary information from employment
  • Investment income including dividends and interest
  • Business profits from self-employment or partnerships
  • Restricted stock units (RSUs) that vested during the year
  • Distributions from trusts or estates
  • Deferred compensation payouts

I recommend creating a comparison table showing your 2024 actual taxes versus your 2025 projected taxes. Many taxpayers I’ve worked with are seeing baseline tax liability increases of 10-20% due to significant market gains this year. Understanding this differential helps you appreciate the value of year-end planning strategies.

The decision between taking the standard deduction versus itemizing becomes more critical with the new 0.5% AGI floor for deductions taking effect in 2026. This upcoming change should influence your 2025 strategy, potentially making “bunching” deductions this year more attractive. Create a projection table comparing your 2025 income versus your 2026 forecast. For instance, if you’re expecting a 15% income increase from bonuses or equity compensation, accelerating deductions into 2025 might generate better overall tax outcomes.

Review your cash flow patterns and revisit investment portfolios for tax efficiency. Collect essential documents including pay stubs, bank statements, credit cards, mortgages, loans, and investment statements. I suggest creating a checklist table with categories for W-2 forms, 1099s, and K-1s, with everything downloaded by mid-December. Compare these documents to prior year versions to catch any discrepancies that might signal reporting issues or missed income sources.

Maximize Tax Savings Through Investment Strategies and Charitable Giving

After the strong 2025 market performance many investors experienced, tax-loss harvesting becomes an essential strategy. Selling investments at a loss allows you to offset capital gains, reducing your overall tax burden. The tax rate differential between short-term and long-term gains makes this particularly valuable.

Here’s the calculation that matters: short-term gains face ordinary income rates up to 37%, while long-term gains top out at 20% (plus potential 3.8% net investment income tax). Consider this example: if you have a $10,000 capital gain and realize a $10,000 loss to offset it, you save $3,700 in taxes if you’re in the top bracket. Scan your portfolio for underperformers you’ve held for more than one year. Realizing these losses while simultaneously capturing embedded gains in positions you want to rebalance creates powerful tax optimization.

Donating appreciated securities you’ve held for more than one year instead of cash represents one of the most efficient charitable giving strategies available. The math is compelling: donate $10,000 worth of stock with a $4,000 cost basis, and you avoid the $1,200 capital gains tax (at 20% rate) while still receiving the full $10,000 charitable deduction benefit. That’s $1,200 in immediate tax savings beyond the deduction value.

“Bunching” charitable donations accelerates multiple years of giving into a single tax year, maximizing your ability to exceed the standard deduction threshold and claim itemized deductions. This strategy becomes even more important given the 2026 changes on the horizon. Starting next year, a 0.5% AGI floor applies to itemized deductions, and a 35% deduction cap affects taxpayers in the 37% bracket according to JPMorgan Private Bank.

Let me illustrate the impact: with a $1 million AGI, the 0.5% floor reduces your deductible AGI to $995,000 before other itemized deductions apply. Front-loading donations in 2025 avoids this reduction entirely. Always verify charitable organizations using the IRS tool to ensure your contributions qualify for deductions.

For estimated tax payments, apply the lesser-of rule strategically: pay either 110% of your prior year tax or 90% of your current year estimated tax to avoid underpayment penalties. If your 2024 tax was $100,000, your safe harbor is $110,000 for 2025. Alternatively, if your 2025 estimated tax is $120,000, the 90% threshold is $108,000. The lower amount determines your requirement. Quarterly deadlines matter because underpayment penalties run approximately 5-8% annualized, making timely payments worthwhile.

Optimize Retirement Contributions and Required Distributions

Maximizing retirement contributions before year-end delivers immediate tax savings while building long-term wealth. The 2025 contribution limits provide significant opportunities: IRAs accept up to $7,000 (or $8,000 if you’re 50 or older), while 401(k)s and 403(b)s allow $23,500 (or $31,000 with the age 50+ catch-up). If you’re between ages 60 and 63, you can contribute up to $34,750 with the enhanced catch-up provision.

Calculate the tax benefit directly: a $23,500 contribution at the 37% bracket saves $8,695 in current-year taxes. That’s real money staying in your pocket while funding your retirement. Review health savings accounts (HSAs) and flexible spending accounts (FSAs) as well. FSA funds typically expire at year-end, so spending those dollars before forfeiture becomes critical in December.

Self-employed individuals should explore SEP and SIMPLE plans, which offer substantially higher contribution limits based on business income. Compare contribution limits across account types using this framework:

  • Traditional IRA: $7,000 base ($8,000 age 50+)
  • 401(k)/403(b): $23,500 base ($31,000 age 50+, $34,750 age 60-63)
  • SEP IRA: Up to 25% of compensation or $69,000
  • Cash balance plans: Potentially $200,000+ depending on age and income

Roth conversions deserve consideration if you expect higher future tax rates or have a year with temporarily lower income. Model the before-and-after tax impact carefully. Converting $50,000 from a traditional IRA to a Roth at a 24% rate costs $12,000 now but eliminates future required minimum distributions and taxes on growth. The urgency for those aged 60-63 can’t be overstated—this super catch-up contribution window closes after age 63.

If you’re age 73 or older, completing your annual required minimum distribution (RMD) by the December 31 deadline is non-negotiable. The penalty for missing this deadline is severe: 25% of the amount you should have withdrawn (reduced to 10% if corrected quickly). The calculation formula divides your account balance by your life expectancy factor. For example, a $500,000 balance with a life expectancy factor of 25.9 requires an RMD of approximately $19,305.

Charitably inclined retirees should explore the qualified charitable distribution (QCD) option, allowing up to $105,000 in tax-free distributions directly to qualified charities in 2025 according to BBH Capital Partners. This strategy satisfies your RMD requirement while avoiding the income inclusion. Coordinate your distributions with your overall tax baseline and cash flow needs to optimize timing and amounts.

Implement Gift and Estate Tax Strategies and Select Tax Filing Software

The 2025 lifetime gift and estate tax exclusion reaches $13.99 million for individuals and $27.98 million for couples, with increases to $15 million and $30 million respectively scheduled for 2026. These elevated exemptions create substantial planning opportunities, particularly if sunset provisions reduce them after 2025. Make annual exclusion gifts strategically, keeping in mind that direct payments for tuition or medical expenses don’t count against your annual or lifetime limits.

Accelerating larger gifts to take advantage of current exemptions makes sense for high-net-worth families. Consider this example: gifting $18,000 per child annually stays within the annual exclusion, and adding direct tuition payments of $60,000 provides additional tax-free transfers. These strategies reduce your taxable estate while supporting family members’ education and healthcare needs.

Compare straightforward gifts to more sophisticated options like trusts and intra-family loans. Grantor retained annuity trusts (GRATs), intentionally defective grantor trusts (IDGTs), and dynasty trusts offer enhanced benefits for complex estates. Review any new trusts you’re considering and integrate them with comprehensive estate planning early in 2026 to maximize their effectiveness.

Selecting appropriate tax filing software depends on your situation’s complexity. For straightforward returns, Cash App Taxes and TaxSlayer’s Simply Free (priced at $0) handle basic filing needs. TaxSlayer’s Classic ($22.99), Premium ($42.99), and Self-employed ($52.99) plans scale with complexity. TurboTax offers File Own ($0), Expert Help ($39+), and Full Service ($150) options according to SmartAsset’s comparison.

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