Year-End Tax Moves for Retirees: IRA Withholding, RMDs, Charitable Gifts and Roth Conversions

December is when many retirees find out whether their tax bill matches what they planned for. The good news is that several of the most common year-end questions come down to timing and paperwork, not to complicated strategy. The bad news is that a small misstep, like deferring a required withdrawal or converting too much at once, can ripple into higher taxes and surcharges you didn't see coming.

Using IRA withholding instead of quarterly payments

One reader, retired and living on required minimum distributions (RMDs) from traditional IRAs and 401(k) plans, Social Security, and dividends and capital gains from taxable accounts, asked whether it's true that they can skip quarterly estimated payments and simply have tax withheld from a late-year IRA withdrawal. Pretty much, yes.

For federal income tax purposes, withholding counts as if it were paid evenly across the year, no matter when it actually came out. That's why some retirees lean on November or December RMDs to cover what they expect to owe, rather than sending in four quarterly checks.

Here's the mechanic to know. For IRA distributions, federal law sets default withholding at 10% unless you tell your custodian otherwise. You can opt out of withholding entirely, or ask for as much as 100% to be withheld. If you're short on withholding for the year, asking for a bigger percentage on a year-end distribution is the simplest lever to pull. Retirees who want to see how that plays out can look at guidance on RMD withholding as a way to handle estimated taxes.

Deferring your first RMD

The second question came from a reader who turned 73 earlier in the year and was told by an advisor that the 2026 RMD could wait until next year. Required withdrawals generally begin at 73, and the age rises to 75 starting in 2033. The full RMD usually has to come out by December 31, but a first-year RMD gets a grace period: for 2026, the deadline is April 1, 2027.

Waiting is allowed, but it isn't free. Deferring means you aren't taxed on the 2026 distribution in 2026. You are taxed in 2027 on two withdrawals: the deferred 2026 amount and the 2027 RMD. That stacked income raises adjusted gross income (AGI) and taxable income for 2027, and it can push you into a higher bracket than you'd have seen by taking the first withdrawal on schedule.

My read is that a deferral makes sense only when you've modeled both years and the 2027 bump doesn't cause trouble elsewhere. Run the numbers before you wait.

Giving from your IRA with qualified charitable distributions

A 78-year-old who usually writes checks to charity asked how a qualified charitable distribution (QCD) works. For traditional IRA owners who are 70½ or older, a QCD lets money move directly from the IRA to a charity. In 2026, the limit is $111,000.

The QCD has three main tax features. The distribution isn't taxable to you. It isn't added to your AGI. And if you make the QCD before taking your full RMD for the year, it can count toward that RMD.

That combination tends to matter most for two groups. The first is people who take the standard deduction rather than itemizing, since they usually get no extra benefit from writing a check to charity. The second is people who want to keep AGI down to qualify for other tax breaks or to limit Medicare premium surcharges. Giving directly from the IRA also means the gift doesn't show up as income first, which is the whole point. It's still worth confirming the details with your custodian and tax preparer before you move money, because the process has to be handled correctly to count.

Roth conversion traps

The last question asked what, beyond the income tax on the converted amount, a reader should watch for before converting. The reader had the biggest issue right: converted funds are taxed in the year of the conversion. And if the Roth account drops in value afterward, you can't undo the conversion to get back that tax bill. You're stuck with it.

The less obvious problem is AGI. Converted income raises AGI for the year, and AGI drives eligibility for many deductions and credits. Several of these have thresholds designed to phase out for higher earners. Examples include the $6,000 senior deduction for filers 65 and older and the $40,000 cap on state and local tax deductions for itemizers on Schedule A. A higher AGI can also make it harder to deduct medical expenses if you itemize.

Medicare adds another layer. Income from a conversion counts toward modified AGI, and that figure sets the income-related surcharges on Part B and Part D premiums. For surcharges tied to 2024 modified AGI, the thresholds were above $218,000 for joint filers and above $109,000 for single filers, with monthly surcharges on top of the regular premiums. The thresholds for later years are set to be somewhat higher, but a large conversion can still cross them. The risk is that a conversion that looked like a bargain ends up costing more in premiums two years later.

Here's the thing: a Roth conversion doesn't have to be a one-time event. Many retirement planners treat conversions as a multiyear project, converting in increments so the tax hit is spread out. Each year, review income and deductions and decide how much traditional IRA money to convert without pushing yourself into a higher bracket, losing a deduction you rely on, or triggering a bigger Medicare surcharge. A financial or tax professional who knows your full picture can help you set that number.

What ties these together

Each of these moves works because of when money is taxed and how it's counted. Withholding can cover a year's tax bill from a single late distribution. A deferred RMD shifts income into the next year. A QCD keeps charitable dollars out of AGI. A Roth conversion adds income now in exchange for tax-free withdrawals later, with side effects on deductions and premiums along the way.

This is general information, not personal tax or financial advice. Your situation depends on your income mix, state rules and health costs, so it's worth running the numbers or talking to a qualified adviser before you act. Done with that in mind, year-end is a good time to check where your AGI is headed and whether your IRA withdrawals are doing what you want them to.