Quick answer: Your window to lower your 2026 tax bill closes on December 31 — not April 15. Most people wait until spring to think about taxes, but by then nearly every lever has already been locked in. A few deliberate moves now can mean real money stays in your pocket instead of going to the IRS.
The Misconception Worth Clearing Up First
Most people think tax season is April. Here's the deal: April is filing season. Tax season — the window when you can actually change what you owe — ends December 31. After that, the number is the number.
Why 2026 Is a Bigger Deal Than Usual
The One Big Beautiful Bill Act (OBBBA) made several changes that affect your year-end checklist. Tax brackets are now permanent, contribution limits went up, new charitable rules kicked in, and the SALT deduction cap rose to $40,400 for 2026. Last year's checklist won't cut it this year — the rules shifted enough that it pays to review your plan fresh.
7 Year-End Tax Moves Worth Making Before December 31
1. Max Out Your Retirement Accounts
The 2026 401(k) contribution limit is $24,500, with an $8,000 catch-up for those 50 or older (or $11,250 for workers aged 60–63). IRA contributions can technically go in until April 15, 2027 — but 401(k) deferrals come out of paychecks, so December 31 is your real deadline. Check your year-to-date contributions now and bump your percentage on the last few paychecks if you have room.
2. Spend Down Your FSA
Flexible Spending Accounts follow a use-it-or-lose-it rule. The 2026 limit is $3,400, and many plans allow only a $680 carryover into 2027. Check your balance before the year closes and use it on eligible expenses — prescriptions, glasses, dental work — before it disappears.
3. Fund Your HSA
If you have a qualifying high-deductible health plan, an HSA gives you a triple tax advantage: contributions are deductible, growth is tax-free, and withdrawals for medical expenses are tax-free too. The 2026 limit is $4,400 (self-only) or $8,750 (family). Unlike FSAs, HSA funds roll over — but year-end is still a good time to top it off.
4. Harvest Investment Losses (and Gains)
If you hold investments that have dropped below your purchase price, selling before December 31 locks in a loss you can use to offset gains — and up to $3,000 of ordinary income if your losses exceed your gains. Unused losses carry forward indefinitely. Just watch the wash-sale rule: buying a substantially identical security within 30 days before or after the sale disqualifies the loss.
On the flip side, joint filers with taxable income below $98,900 may be able to realize long-term gains at a 0% federal rate — a free opportunity to reset your cost basis higher.
5. Consider a Roth Conversion
A Roth conversion moves money from a traditional IRA into a Roth IRA. You pay ordinary income tax now; qualified withdrawals later are completely tax-free. Conversions must be completed by December 31 and cannot be undone. The smart play is to size the conversion so it fills your current bracket without pushing you into the next one. For 2026, the 22% bracket for joint filers tops out at $211,400.
6. Review Your Charitable Giving Strategy
New in 2026: taxpayers who itemize face a charitable floor equal to 0.5% of adjusted gross income before donations start generating a deduction. That changes the math for smaller givers. If you give regularly but don't itemize, consider bunching several years of donations into one year — often through a donor-advised fund — to clear the standard deduction threshold. Retirees over 70½ can use a qualified charitable distribution (QCD) directly from an IRA to satisfy required distributions without adding to taxable income.
7. Take Your Required Minimum Distribution (RMD)
If you're age 73 or older, you must take your RMD by December 31 or face a significant penalty. This is a hard deadline with no flexibility. If you haven't taken it yet, now is the time — don't leave this one to the last week of December when processing times can catch you off guard.
One More Thing: Check Your Withholding
If you received a bonus, sold investments, or changed jobs this year, a quick check of your withholding before year-end can prevent an underpayment penalty in April. It takes five minutes and can save you a headache later.
Frequently Asked Questions
What is the deadline for year-end tax planning in 2026?
Most tax moves — 401(k) contributions, Roth conversions, charitable gifts, tax-loss harvesting, FSA spending, and RMDs — must be completed by December 31, 2026. IRA and HSA contributions for 2026 can be made until April 15, 2027.
How much can I contribute to my 401(k) in 2026?
The 2026 401(k) elective deferral limit is $24,500. Workers aged 50 or older can contribute an additional $8,000 as a catch-up. Workers aged 60–63 have an even larger catch-up of $11,250.
What changed about charitable deductions in 2026?
Under OBBBA, taxpayers who itemize are now subject to a new floor equal to 0.5% of adjusted gross income before charitable contributions generate a deduction. Smaller donations may not produce the same tax benefit they did in prior years, making strategies like bunching or qualified charitable distributions more valuable.
Is a Roth conversion a good idea in 2026?
It depends on your income and bracket. If your 2026 taxable income is lower than usual or you have room left in a lower bracket before year-end, a Roth conversion can lock in tax-free growth for the future. A qualified tax professional can help you size the conversion correctly for your situation.
What happens if I miss my required minimum distribution?
Missing an RMD triggers an IRS excise tax — historically steep — on the amount you should have taken. The deadline is December 31. If you're 73 or older and haven't taken your RMD yet, act now.
Does the SALT deduction change affect me in 2026?
The SALT (state and local tax) deduction cap rose to $40,400 in 2026, which may make itemizing deductions worthwhile for some taxpayers who previously got little benefit from property and state income taxes. However, the benefit phases down at higher income levels, so it's worth running the numbers with a tax professional.
Ready to Make a Plan?
Year-end tax planning works best when you have a full picture — income, deductions, retirement accounts, and what's changed under the new rules. If you haven't reviewed your 2026 tax position yet, now is the right time.
Short version: Don't wait until December 28 to figure this out. The opportunities are real, but they expire.
Our team at Champion Tax & Financial Services can run a year-end projection with you and identify the moves that actually make sense for your situation — before the clock runs out.
📞 Call us at (713) 777-0200 or visit www.ctaxfinancials.com to schedule your year-end tax review.
Reality check: You can't control the tax code, but you can control when you act. October beats December every time.
This article is for general informational purposes only and does not constitute individualized tax, legal, or financial advice. Tax rules and eligibility requirements vary based on individual circumstances. Consult a qualified tax professional for guidance specific to your situation.
