Year-end tax moves to make are income and deduction timing decisions you take before the calendar year closes, so that less of your money ends up in taxable income. Most of the window shuts on December 31, a few run to your filing deadline, and the highest-value ones cost nothing but an afternoon.
This list is written for US readers, with a UK note near the end because that market runs on a completely different clock. Every move below names who it is for, when the door closes, and who should skip it. Rules, limits and brackets change every year, so confirm the current-year figures on IRS.gov before you move money.
One caveat up front: this is educational, not individualized tax advice. If your situation involves a business, equity compensation, a large one-time gain, or a state with its own income tax, a CPA or enrolled agent earns their fee here.
Table of Contents
- Year End Tax Moves to Make at a Glance
- 1. Review Your Year-End Tax Picture Before Making Moves
- 2. Maximize Eligible Retirement Contributions
- 3. Use HSA Contributions Strategically
- 4. Make Qualified Charitable Contributions
- 5. Harvest Investment Losses and Gains With a Tax Lens
- 6. Rebalance or Adjust Taxable Investments
- 7. Check Deductions You May Have Missed
- 8. Pay Eligible Educational or Job-Related Costs
- 9. Time Estimated Payments and Withholding Adjustments
- 10. File or Amend Returns and Preserve Records
- Year End Tax Moves Checklist
- Frequently Asked Questions
- What are the best year end tax moves to make in December?
- Are there tax benefits I can still claim after December 31?
- Should I make a Roth conversion before the end of the year?
- Does filing a tax extension give me more time to pay?
- Is donating appreciated stock tax-deductible?
- How late can I contribute to an IRA or 401(k) for the prior year?
Year End Tax Moves to Make at a Glance
Start here if you only have ten minutes. The table is ordered roughly by how much benefit most people get per hour spent.
| Move | Who it helps | Main deadline | Key consideration |
|---|---|---|---|
| Project your year-end taxable income | Anyone whose income changed | Ideally weeks before December 31 | Everything else depends on the number |
| Maximize 401(k) and IRA contributions | Employees and savers with spare cash | December 31 for 401(k), filing deadline for IRA | Check catch-up eligibility and plan rules |
| Contribute to an HSA | Anyone in an HDHP with unspent funds | Filing deadline, not December 31 | Also subtract your employer contribution |
| Give appreciated securities or bunch gifts | Investors and consistent donors | December 31 for the deduction | Requires substantiation and a holding period |
| Harvest capital losses | Investors sitting on gains | December 31 | The wash-sale rule can undo the whole thing |
| Rebalance taxable accounts deliberately | Long-term investors | December 31 | Do not trade purely for the deduction |
| Review deductions you may have missed | Households with a big or unusual year | December 31 | Check the standard versus itemized cliff |
| Handle education and job costs | Students and employees | December 31, or when you pay | Tax-free versus tax-deferred beats a deduction |
| Adjust withholding or make an estimated payment | Self-employed and multi-job households | Quarterly, with a January 15 payment for year-end income | The safe harbor test uses prior-year income |
| File, amend, and keep your records | Everyone | April 15, extensions aside | An extension buys time to file, not to pay |
1. Review Your Year-End Tax Picture Before Making Moves
Pull your year-to-date income, your estimated payments already made, and your withholding to date, then project what lands on your Form 1040 in April. That projection is the whole ballgame, because every other move on this list only matters relative to it.
Look for the usual trouble spots: a bonus or commission paid in December, restricted stock that vested, a home sale, a side business that had a big year, or a spouse who started working. Any of those can move you into a higher bracket without you noticing.
Use your tax software’s projection feature, or a simple worksheet. Check whether you qualify for the child tax credit or other credits at your income level, and note the phase-out thresholds. Where you land relative to those thresholds matters more than your total income.
Skip it if your income has been flat all year and you already file for a refund. A projection is still useful, but you do not need to act on it.
If you have not run one yet, the IRS withholding estimator on IRS.gov is free and takes about ten minutes. It uses the same worksheet as Form W-4.
2. Maximize Eligible Retirement Contributions
Traditional 401(k) and IRA contributions have to be made inside the tax year to count for that year. A 401(k) employee deferral generally has to be funded through payroll by December 31, which means the decision has to be made a few weeks earlier. IRA contributions are more forgiving and can run to the filing deadline of the following year.
A traditional IRA contribution can reduce your taxable income if you have enough earned income to deduct it, subject to your filing status and participation in a workplace plan. A Roth IRA contribution does not reduce current income but can grow and be withdrawn tax-free in retirement if you meet the rules.
If you are 50 or older, catch-up contributions are available in both accounts and come with their own higher limit. Confirm the current-year limit on IRS.gov rather than trusting a number you saw in an article last spring, including the income phase-out that applies to Roth contributions.
Also check your employer match. Contributing enough to capture the full match is a guaranteed return that beats almost any tax trick, and it costs nothing to leave on the table.
Skip it if you are carrying high-interest debt at rates above what the retirement deduction is really worth, or if the contribution would push you past the income limit for a deductible contribution.
3. Use HSA Contributions Strategically
Health Savings Account contributions are one of the least appreciated moves on this list, because the deadline is not December 31. HSA contributions for a given year can be made as late as the federal filing deadline for that year, which gives you months of extra room.
Contributions reduce your taxable income, and qualifying withdrawals are tax-free. The catch is that your employer may also contribute, and the annual limit applies to the combination. Self-employed people can generally deduct an HSA contribution as a business expense, subject to their own coverage.
What is left in the account is not use-it-or-lose-it money. Many people treat an HSA as a retirement account and let it grow for decades.
Skip it if you are on a standard health plan, or if your employer already funds you to the annual maximum.
4. Make Qualified Charitable Contributions
Cash donations to qualified organizations are deductible against your itemized deductions. Donating appreciated securities you have held more than a year is usually better still, because you avoid realizing the embedded capital gain and can still deduct the fair market value.
Bunching is the other idea. If you donate a similar amount most years, giving a larger gift every other year or two can push you into itemizing in those years and out of the standard deduction in the others, which can come out ahead. It works best when you would have itemized anyway.
A donor-advised fund gives you the same bunching benefit with a one-time contribution, plus smaller grants each year as the fund pays them out. The rules around appreciated assets and donor-advised funds have tightened in recent years, so check the current treatment before you move shares.
Substantiation matters. Keep the contemporaneous written acknowledgment from the charity for any gift of 250 dollars or more, and complete Form 8283 for non-cash gifts above the appraisal threshold.
Skip it if you take the standard deduction and your giving stays under it, or if the shares are short-term holdings with embedded losses you would rather realize yourself.
5. Harvest Investment Losses and Gains With a Tax Lens
Realized capital losses can offset realized capital gains first, and up to 3,000 dollars of net loss can offset ordinary income in a year. If you realized a large gain this year, selling something at a loss before December 31 can meaningfully reduce the bill.
Here is where the wash-sale rule bites. If you buy a substantially identical security within 30 days before or after the sale, the loss is disallowed and added to the cost basis of the replacement. It also applies across accounts, including an IRA, and it catches mutual funds you did not choose deliberately. Pay attention to year-end capital gain distributions from funds, which can quietly create taxable gains inside a tax-advance fund.
Run the numbers before you trade. Compare the estimated tax saving against transaction costs and ask whether selling changes your actual risk exposure. If the position is one you would not want to hold anyway, harvesting is easier to justify.
Skip it if you are already sitting in the 0 percent long-term capital gains bracket, since you have no gain to offset.
Members of r/investing describe the same scenario repeatedly: a big sale of long-held company stock at a high price, followed by the realization that diversification was overdue. The tax bill is not avoidable in that case, but the loss-harvesting move usually reduces it.
6. Rebalance or Adjust Taxable Investments
Year-end is a natural time to bring a portfolio back to target, and there is a tax-aware way to do it. Sell appreciated positions first, buy more of the positions that are down, and direct new contributions to underweight assets. That approach gets you to target while shrinking the gain you have to report.
Asset location matters here too. Taxable accounts can hold high-turnover, high-growth assets, while retirement accounts are better for bonds and broadly diversified equity funds you will not touch.
Skip it if the rebalance would cost more in taxes and trading than the risk reduction is worth. Tax-motivated trades that damage diversification are a bad deal.
7. Check Deductions You May Have Missed
Unusually large medical and dental expenses are the big one. If your unreimbursed costs exceed the applicable percentage of your adjusted gross income, the excess can be itemized. A year with major dental work, surgery, or a long prescription run is exactly when this bites.
State and local income tax paid, or the general sales tax, belong in the same bucket. Property taxes and mortgage interest usually surface on your Form 1098, but if the lender did not send one, you can request it.
Other categories worth checking: home-office items if you genuinely and exclusively use part of your home for work, tuition and related fees, charitable receipts, and casualty losses from a federally declared disaster. Do not assume any of these are deductible; the rules are narrow and getting them wrong creates an audit flag.
Run the standard deduction against your total itemized deductions before giving up. If your itemized total sits just below the standard deduction, charitable giving and medical expenses can tip it the other way. That is the arithmetic behind bunching.
Skip it if your itemized total lands meaningfully below the standard deduction and you have no unusual expenses.
8. Pay Eligible Educational or Job-Related Costs
Education credits, the student loan interest deduction, and tuition and fees can all matter, but they interact. Credits reduce tax; deductions reduce income, and they do not stack cleanly. Work through the ordering with software or a preparer rather than assuming both apply.
For job-related costs, look at whether your employer offers a taxable or nontaxable education assistance program. Nontaxable assistance is better than a deduction, because the money never enters your taxable income. Up to a set annual amount can be excluded under an employer’s program without substantiating the expense.
Skip it if the course is purely personal, which is not deductible, or if the credit phases out at your income level.
9. Time Estimated Payments and Withholding Adjustments
Self-employed and gig workers usually pay quarterly estimated taxes, and the January 15 payment is the one people forget because it falls in the next calendar year. That payment covers the prior year’s income, and skipping it triggers an underpayment penalty even if you file on time and pay in full with the return.
The safe harbor is the escape hatch. If you paid at least 90 percent of the current year’s tax, or 100 percent of 110 percent of the prior year’s tax, the IRS generally waives the penalty. The second test is the one most people qualify under without realizing it.
Employees can use extra withholding on Form W-4 to cover a year with unusual income, such as a large bonus. The extra amount can be spread across the remaining pay periods rather than triggering estimated payments.
Skip it if your income did not spike and withholding already covers your liability. Over-withholding just shrinks your refund.
The IRS annual withholding percentage tables in Publication 505 still work for many people, but the withholding estimator is more accurate if you can fill it in.
10. File or Amend Returns and Preserve Records
An extension to file pushes your filing deadline out, typically to October 15 for an April return. It does not extend the time to pay, which is why a large balance due still triggers a penalty if it is not paid by the original deadline.
An amended return, Form 1040-X, is the right tool when you missed a deduction, received a corrected form after filing, or had a filing status error. It must be filed within three years of the original return, and in some cases the time runs out before the refund statute closes.
Keep your records until the statute of limitations expires, generally three years from filing, or longer if you omitted income. In practice, digital copies of your W-2s, 1099s, 1098 forms, brokerage statements and charitable acknowledgements answer most audit questions on their own.
Skip it if nothing changed after filing. Amending costs time and can flag a return for review.
Year End Tax Moves Checklist
If you work through this in order, you will not miss the deadline that matters most to you.
- Gather your W-2s, 1099s, 1098 forms and account statements for the year.
- Project your taxable income and note any thresholds you are close to.
- Confirm your employer match and your remaining 401(k) deferral room.
- Check your HSA balance and your remaining HSA contribution room.
- List unrealized gains and losses and pick candidates for harvesting, minding wash sales.
- Decide on charitable giving, including whether you will bunch or donate appreciated shares.
- Add up potential itemized deductions and compare them with the standard deduction.
- Update Form W-4 or schedule the January 15 estimated payment.
- File or extend before the deadline, and pay any balance due on time.
- Talk to a professional if your situation involves a business, equity comp, or a large one-time gain.
Frequently Asked Questions
What are the best year end tax moves to make in December?
The highest-value moves are projecting your taxable income, maximizing 401(k) and IRA contributions, harvesting losses against realized gains, and adjusting withholding. Bunching charitable gifts or giving appreciated securities can matter most if you itemize. Start with the projection, because it tells you which of the rest are worth the effort.
Are there tax benefits I can still claim after December 31?
Some, yes. IRA and HSA contributions for the prior year can generally be made up to the federal filing deadline, which is later than December 31. Retirement plan contributions, charitable deductions, capital loss harvesting, and income timing mostly close with the year. Check the prior-year limits before you contribute in January.
Should I make a Roth conversion before the end of the year?
Convert when you expect your current-year taxable income to exceed your income in the year of withdrawal. Roth conversions have no annual dollar cap, but the converted amount adds to that year’s taxable income and can push you into a higher bracket or affect credit phase-outs. A backdoor Roth is one option if your income is too high for a direct contribution.
Does filing a tax extension give me more time to pay?
No. An extension gives you more time to file, not more time to pay. Interest and a late-payment penalty generally start after the original deadline, and the penalty can be eight percent of the unpaid amount or the federal short-term rate, whichever is higher. Pay your estimated balance by the original deadline and file the extension separately.
Is donating appreciated stock tax-deductible?
Generally yes, if you give long-held appreciated securities to a qualified organization and itemize deductions. You can deduct the fair market value without recognizing the embedded capital gain, which is why it beats writing a check. You must have held the shares more than a year and keep the contemporaneous acknowledgment from the charity.
How late can I contribute to an IRA or 401(k) for the prior year?
For an IRA, you can generally contribute for the prior year up to the federal filing deadline, so a January or even an April contribution still counts for that year. A 401(k) employee deferral is different: it normally has to come out of payroll before December 31. Self-directed SEP or SIMPLE IRA plans follow their own deadlines.
A short note for UK readers: the equivalent deadline is 5 April for ISA allowances and pension contributions, and the tax year runs April to April. Gift Aid works differently from the US charitable deduction, and there is no 30-day wash-sale rule. Everything above is written for the US framework.
If it is already late in the year, practitioners say plainly that many planning windows have already closed. What still works: fund your IRA and HSA before the filing deadline, make the January 15 estimated payment if one is due, adjust your W-4 to avoid an overpayment next year, and start next year’s projection now. A December mistake is rarely fatal, but waiting until January to start is.
The first thing to do is run the projection. Once you know your projected taxable income and your bracket, the rest of these year end tax moves to make become obvious rather than theoretical.
