Your 2025 End-of-Year Tax Checklist

The final weeks of the year are more than a countdown to the holidays. They’re your last chance to shape your refund or reduce what you’ll owe next April. A few proactive steps before December 31 can shrink your 2025 tax bill, boost retirement savings, and keep you from leaving money on the table.

The earlier you check your numbers in terms of income, deductions, and investments, the more control you have over preventing penalties and capturing deductions. Whether you’ve changed jobs, earned a raise, started a side gig, or had a family milestone this year, a quick end-of-year 2025 tax review can make all the difference. Use this checklist to finish the year financially strong and tax-ready.

Review Your Income and Withholdings

Start with your paycheck. If too much or too little tax is being withheld, your return will show it—either as a refund you didn’t need to give the IRS or a balance you didn’t expect to owe. A quick check before December 31 can help you avoid surprises and align what’s being withheld with what you’ll actually owe.

Here’s what to do:

• Run the numbers. Use the IRS Tax Withholding Estimator to compare your current withholdings against your projected 2025 income.
• Update your W-4. Make adjustments if you’ve had a major change this year, like a new job, side income, a raise, or a spouse returning to work.
• Know the red flags. Steven Rogé, CFP and CEO of R.W. Rogé & Company, cautioned that “multiple jobs or a spouse’s new job stacking into a higher bracket, restricted stock units (RSUs) or bonus income taxed at flat rates, dependents aging out, or losing itemized deductions” can throw withholding off balance.
• Watch special situations. Side gig holders who don’t make estimated payments and new retirees who began required minimum distributions (RMDs) mid-year often end up owing more than expected.
• Hit a safe harbor. Rogé recommended paying “90% of this year’s tax or 100% of last year’s (110% if adjusted gross income (AGI) exceeded $150,000). If you’re off track in November, adjust W-4s now so payroll can fix the glide path instead of your April checkbook.”

Maximize Retirement Contributions

Your retirement accounts are some of the most powerful tools for reducing taxable income and building long-term wealth. Year-end is the last chance to make sure you’re capturing every available dollar in tax-advantaged savings.

Here’s what to do:

• Check your limits. For 2025, you can contribute up to $23,500 to a 401(k), plus a $7,500 catch-up if you’re between 50 and 59, or 64 and older. Savers aged 60, 61, 62, and 63 are eligible for a higher catch-up contribution of $11,250. Employee contributions must be made by December 31, 2025.
• Top off early. If you’ve had a raise or bonus, increase your contributions for the final pay periods to hit the annual limit. Rogé warned that “employees routinely leave 401(k) space on the table,” especially when catch-ups are available.
• Max out your IRA. You can contribute up to $7,000 to a traditional or Roth IRA for the 2025 tax year ($8,000 if you’re 50 or older) until April 15, 2026, the federal tax-filing deadline. Contributions made before that date still count toward 2025 and may reduce taxable income if you qualify for a traditional IRA deduction.
• Don’t skip your HSA. If you’re eligible, you can contribute $4,300 for individuals or $8,550 for families, with an extra $1,000 catch-up if you’re 55 or older. Rogé called it a “stealth Roth for health care—invest it and save receipts for later tax-free reimbursements.”

Make Smart Charitable Contributions

Charitable giving can do double duty. It’s a great way to support the causes you care about while reducing your tax burden. Strategic donation timing and the right giving vehicle make all the difference.

Here’s what to do:

• Donate appreciated assets. Giving long-term appreciated securities instead of cash avoids capital gains while allowing you to deduct full fair-market value.
• Use a donor-advised fund (DAF). Contributing to a DAF allows you to take an immediate tax deduction, but you don’t have to choose which charity gets your donation until later.
• Know whether to use a standard or itemized deduction. Charitable deductions only reduce your tax bill if you itemize. Rogé recommended “bunching several years of gifts to clear the standard deduction hurdle,” so you can itemize in that year and maximize the tax benefit of your giving.
• Consider a QCD if retired. Qualified charitable distributions (QCDs) from IRAs can satisfy RMDs and lower your adjusted gross income. Rogé noted that “for 2025, the QCD limit is indexed at $108,000.”
• Plan ahead for next year. Early in 2026, create a “giving charter” and pre-stage appreciated shares or open a DAF to avoid the last-minute December rush.

Always keep donation receipts and acknowledgment letters. The IRS requires proper documentation to claim charitable deductions, even for donor-advised funds or QCDs.

Review Investments and Capital Gains

Investment gains and losses can have a major impact on your year-end tax bill. Reviewing your portfolio before December 31 gives you time to rebalance, harvest losses, or take gains strategically.

Here’s what to do:

• Harvest losses early. Sell underperforming investments before year-end to offset gains and deduct up to $3,000 in ordinary income.
• Pick your lots. Rogé recommended confirming your broker uses specific identification so you can sell the highest-cost shares first when realizing gains.
• Check your tax bracket. If you fall under the 0% long-term capital gains rate, you can sell appreciated investments to reset your cost basis tax-free.
• Watch mutual-fund timing. Avoid buying funds right before their capital-gain distributions in November or December.

Long-term capital gains are still taxed at 0%, 15%, or 20% for 2025, depending on income, with high earners potentially owing an additional 3.8% net investment income tax. Rogé advised modeling both federal and state taxes to estimate tax liabilities before making large trades.

Organize Deductions and Credits

A little organization before year-end makes filing easier and can uncover deductions you might otherwise miss.

Here’s what to do:

• Gather major deduction documents. Collect statements for mortgage interest, student loans, medical expenses, and property taxes.
• Check for expiring credits. Review eligibility for child tax credits and education credits while there’s still time to qualify.
• Charitable giving strategy. Charitable donations only reduce your tax bill if you itemize deductions. If you don’t itemize, qualified charitable distributions (QCDs) from an IRA can still lower taxable income by satisfying required minimum distributions directly.
• Create a digital folder. Save all receipts, acknowledgment letters, and supporting documentation for easier filing and audit protection.

Prepping now can save hours during tax season and may reveal deductions you’d otherwise overlook.

Plan for Self-Employment or Side Income

Self-employed freelancers, contractors, and side-gig workers often face unexpected tax bills. A few year-end adjustments can help you get ahead of them.

Here’s what to do:

• Estimate year-to-date income. Use your accounting software or bank records to tally up your total self-employment income.
• Make estimated payments. If you haven’t already paid quarterly taxes, make a final estimated payment by January 15, 2026, to avoid penalties.
• Track deductible expenses. Common write-offs include home office costs, mileage, equipment, software, and professional fees. Ensure you have proper documentation to support your expenses.
• Consider retirement options. SEP IRAs and solo 401(k)s let business owners contribute a percentage of earnings and deduct it from taxable income. It’s one way to cut taxes while saving for the future.

Prepare for State and Local Tax Considerations

Your federal plan may be solid, but state and local taxes can create their own surprises. Knowing the limits and deadlines can keep your planning consistent across the board.

Here’s what to do:

• Prepay certain taxes if strategic. Some states allow early payment of property or state income taxes if you itemize deductions.
• Understand the SALT cap. The federal deduction for state and local taxes (SALT) is increased from $10,000 to $40,000 under the One Big Beautiful Bill Act. 
• Check state deadlines. States vary in their estimated tax and filing deadlines. It’s essential to review these documents before year-end to ensure compliance.
• Account for residency changes. If you’ve moved or worked remotely in another state, confirm which state claims your income to avoid double taxation.

“State deadlines can sneak up on you,” Rogé warned, “especially for property-tax prepayments or estimated-tax vouchers that fall between Christmas and New Year’s.” Taking a few minutes to review state rules can reveal hidden savings and prevent penalties.

Get Professional Help if Needed

When your financial life extends beyond a single W-2, it may be time to call in reinforcements. If you’ve hit a point where multiple goals, income streams, or strategies overlap, professional help can save you far more than it costs.

Here’s what to do:

• Know when to call a pro. Rogé explained, “Equity compensations, multi-state income, K-1s, rental real estate, crypto, business sales, large charitable strategies, Roth conversions, or RMD coordination are common tripwires.”
• Book early. December appointments fill quickly. Schedule a year-end consultation before filing season starts to discuss pre-filing strategies.
• Bring full context. A CPA or CFP can optimize across tax, investment, and retirement planning. A pre-filing consultation in December can identify missing deductions, estimate your 2025 liability, and confirm your tax-saving moves before deadlines pass, ensuring you don’t save a dollar in one line only to lose three in another.

When your finances get complex, coordination is key. Professional guidance can turn tax planning from a guessing game into a well-timed strategy.

The Bottom Line

Year-end tax planning may not be glamorous, but it’s powerful. Review your income and withholding, maximize your contributions, plan charitable gifts, and fine-tune your investment and business strategies before the end of the year. As Rogé reminded us, “Big refunds and big surprises don’t happen by magic—they happen because withholding wasn’t aligned with reality.” Take time this season to realign your finances, lock in deductions, and give yourself the gift of a stress-free tax season.