Most retirement tax decisions get discussed in April, when the tax bill arrives and it’s usually too late to change anything. By the time a return is being prepared, the year’s taxable income is already set. The real window for retirement tax planning closes on December 31, and for several of the moves below, the paperwork needs to be in motion weeks before then.
The final two months of 2026 make for a useful checkpoint. Tax brackets set under the One Big Beautiful Bill Act are now permanent, a new senior deduction is available through 2028, and Medicare surcharges still hinge on income decisions made two years in advance. Each creates an opportunity to manage the tax burden on retirement income, both for current retirees and for those nearing retirement age, and the best results usually come from looking at them together.
Key Takeaways
- Roth conversions, qualified charitable distributions, and most other retirement tax planning moves must be completed by December 31 to count for the 2026 tax year.
- RMD planning starts with confirming your deadline, since delaying your first required minimum distribution to April 1 can stack two distributions into one tax year.
- Modified adjusted gross income reported for 2026 determines Medicare IRMAA surcharges in 2028, so a large conversion or capital gain can raise premiums two years later.
- Taxpayers 65 and older may claim a new deduction of up to $6,000 per person through 2028, though it phases out as income rises.
- The most effective retirement tax strategies coordinate withdrawals from tax deferred accounts, Roth conversions, charitable giving, and Medicare thresholds as one plan.
Why December 31 Matters for Retirement Tax Planning
Taxes in retirement behave differently once the paychecks stop. During your working years, an employer largely determined your gross income. In retirement, you decide much of it yourself through which retirement income sources you draw from, how much you convert, and when you realize capital gains. That control is valuable, but only when it’s used on purpose.
Nearly every lever runs on a calendar-year deadline. A Roth conversion completed on January 2 lands in the next tax year. An IRA gift to charity that leaves the custodian after December 31 won’t count toward this year’s RMD. Custodians also get busy in December, and many set internal cutoffs for distribution and conversion requests well before the holidays. Starting the review in early November leaves room to run projections, check in with your tax professional, and act without rushing.
There’s a longer horizon to keep in view, too. Sound tax planning for retirement measures success by your overall tax bill across retirement, and this year’s tax liability is only one piece of that. Choosing to pay taxes in a lower tax bracket today can make sense when it shrinks the balance in tax deferred retirement accounts subject to future RMDs, lowers taxes for heirs, or keeps future income below Medicare thresholds. Sometimes the opposite holds. The aim is to smooth taxable income across retirement so it doesn’t spike into a higher tax bracket in some years and leave low brackets unused in others.
RMD Planning: Getting Required Minimum Distributions Right
Required minimum distributions (RMDs) are how the IRS eventually collects on decades of tax deferred growth. Under SECURE 2.0, RMDs from traditional IRAs, 401(k)s, and most other qualified retirement plans generally begin at age 73 for those born between 1951 and 1959 and at 75 for anyone born in 1960 or later. Each distribution is taxed as ordinary income, and the amount comes from dividing your prior December 31 balance by a life expectancy factor in the IRS tables.
Confirm the Deadline for Your First RMD
Your first RMD can wait until April 1 of the year after you reach your required beginning age. That flexibility carries a cost. Delaying means taking two distributions in the same calendar year, which can push income into a higher bracket, shrink the senior deduction, or trigger an IRMAA surcharge. For many retirees, taking the first distribution in the year they turn 73 produces a smoother outcome. Every RMD after the first is due by December 31.
Know the Penalty and the Aggregation Rules
Missing an RMD brings one of the steeper tax penalties in the code: an excise tax of 25% of the shortfall, reduced to 10% when the error is corrected promptly. That’s far lower than the old 50% penalty, though still an avoidable cost, and scheduling automatic distributions is a simple way to avoid tax penalties altogether. If you own several individual retirement accounts, you can total their RMDs and withdraw the full amount from any one of them. Defined contribution plans such as 401(k)s generally work differently, with each plan’s RMD coming from that plan.
Review Inherited Accounts
Inherited IRAs carry their own required minimum distribution planning. Most non-spouse beneficiaries must empty the account within 10 years, and when the original owner had already started RMDs, annual withdrawals are generally required during that window as well. The IRS waived penalties on those annual amounts for several years, but that relief ended and the withdrawals have been required since 2025. Spreading distributions across the decade frequently costs less in tax than one large withdrawal in year ten.
Use Your RMD as a Planning Tool
Good RMD tax planning connects the distribution to everything else on this list. A qualified charitable distribution can satisfy part or all of the requirement. Federal income tax withheld from a December RMD is treated as if it were paid evenly throughout the year, which can help cover a shortfall in earlier estimated tax payments. A distribution you have to take anyway can quietly fix a problem elsewhere in the return.
Roth Conversion Planning Now That Tax Rates Are Set
A Roth IRA conversion moves money from traditional retirement accounts, such as a traditional IRA or a 401(k) funded with pre tax contributions, into a Roth IRA. You pay income tax on the converted amount now, and qualified Roth IRA withdrawals come out tax free later. Roth accounts also have no RMDs for the original owner, which gives you more control over taxable income in your later years and can leave heirs a more tax-friendly inheritance.
For several years, Roth conversion planning came with an extra question attached: would the lower tax rates from 2017 expire after 2025? The One Big Beautiful Bill Act made the current tax brackets permanent, removing that particular deadline. Permanence in tax laws only lasts until Congress acts again, of course, and the case for converting still depends on your own numbers. The key comparisons are your current tax bracket, the tax rate you expect once RMDs and Social Security arrive, and how a surviving spouse would be taxed after switching to a single filing status.
Finding the Right Amount
One large conversion is rarely the most efficient path. Many retirees do better converting measured amounts each year, filling a target bracket without spilling into a higher tax bracket. The years between retirement and the start of RMDs often bring the lowest taxable income a person will see for decades, which can make them ideal for gradually shifting retirement savings into tax free status.
Watching the Side Effects
Conversion income counts toward modified adjusted gross income. A conversion can therefore make more of your Social Security benefits taxable, reduce or erase the senior deduction, and push income over an IRMAA threshold two years later. A few other details deserve attention before you act:
- Conversions can’t be undone, so the amount needs to be right before the transaction settles.
- Paying the tax from a taxable account, instead of from the IRA itself, generally preserves more of the converted value.
- Each conversion starts its own five-year clock for penalty-free access to converted principal if you’re under 59½.
- The conversion must be completed by December 31 to count for 2026.
Medicare IRMAA Planning and the Two-Year Lookback
Medicare’s income-related monthly adjustment amount, known as IRMAA, adds a surcharge to Part B and Part D premiums for higher-income beneficiaries. It’s one of the most overlooked costs in retirement, largely because the bill shows up two years after the income that caused it.
For 2026, Medicare set premiums using 2024 tax returns. The standard Part B premium is $202.90 per month, and surcharges begin once 2024 modified adjusted gross income exceeded $109,000 for single filers or $218,000 for married couples filing jointly. Carry that logic forward and the picture is clear: whatever income you report for 2026 will set your premiums for 2028.
IRMAA tiers work like cliffs. A single dollar over a threshold triggers the full surcharge for that tier, and it applies to each spouse enrolled in Medicare. Effective Medicare IRMAA planning usually comes down to knowing exactly where your projected MAGI sits before you finalize a conversion, sell an appreciated holding, or take an extra IRA withdrawal in December. Interest from municipal bonds, although exempt from federal income tax, still counts toward MAGI for this purpose, which catches many investors off guard.
Two other points are worth remembering. If your income dropped because of retirement, the death of a spouse, divorce, or another qualifying life-changing event, you can ask Social Security to use more recent income by filing Form SSA-44. And for those approaching Medicare eligibility, the lookback reaches back before enrollment, so income earned at 63 sets premiums at 65.
Social Security Taxes and the New Senior Deduction
Many retirees are surprised to learn their Social Security benefits are taxable at all. Up to 85% can be subject to federal income tax, depending on a figure the IRS calls provisional income and the Social Security Administration calls combined income: your adjusted gross income, plus tax-exempt interest, plus half of your benefits. The thresholds that trigger taxation ($25,000 and $34,000 for single filers, $32,000 and $44,000 for married couples filing jointly) have never been indexed for inflation. Each year, more retirees cross them.
Within that range, every additional dollar of taxable withdrawals from an IRA can also pull more benefits into taxable income. The effective income tax rate on that dollar can run well above the stated bracket as a result. Retirement income tax planning helps identify these zones so withdrawals and conversions can be sized around them.
How the Senior Deduction Works Through 2028
The One Big Beautiful Bill Act added a tax deduction of up to $6,000 for each taxpayer age 65 or older, available for tax years 2025 through 2028. A married couple who both qualify can deduct up to $12,000. It’s available whether you itemize or take the standard deduction, and it stacks on top of the existing additional standard deduction for those 65 and older. Married couples filing separately can’t claim it.
The deduction shrinks by 6% of MAGI above $75,000 for single filers and $150,000 for joint filers, disappearing entirely at $175,000 and $250,000. Consider a couple with $200,000 of MAGI. They sit $50,000 above the threshold, so each spouse loses $3,000, leaving $6,000 combined instead of $12,000.
For households near that range, the deduction changes the math on Roth conversions and capital gains. Converting a bit less now and more after 2028 may produce greater tax savings for some retirees. For others, the conversion still wins. The only way to know is to run both scenarios against your actual income.
Tax Efficient Retirement Withdrawals and Charitable Giving
Where your retirement income comes from matters almost as much as how much you take. Most retirees hold some mix of taxable brokerage accounts, tax deferred accounts like IRAs and 401(k)s, and tax free Roth accounts. Each receives different tax treatment, so tax efficient retirement withdrawals draw from these retirement assets in a deliberate order, and the right order can shift from one year to the next.
Revisit Your Withdrawal Sequence
The conventional rule of thumb says to spend taxable accounts first, tax deferred accounts second, and Roth money last. It’s a reasonable starting point. Followed rigidly, though, it can leave low brackets unused early in retirement and set up oversized RMDs later. A blended approach that includes some traditional IRA withdrawals during low-income years often produces a smoother lifetime tax picture. Late in the year, compare actual 2026 income against your target and adjust the final withdrawals to fit.
Health savings accounts deserve a place in this sequence, too. Withdrawals for qualified medical expenses, including many Medicare premiums, come out tax free, which makes these tax advantaged accounts a natural source for healthcare costs that might otherwise be paid with taxable dollars.
Give to Charity Directly From Your IRA
For charitably inclined retirees age 70½ or older, a qualified charitable distribution ranks among the most efficient retirement tax strategies available. A QCD sends money straight from an IRA to a qualifying charity. The amount is excluded from income, and for anyone subject to RMDs, it counts toward the requirement. The 2026 limit is $111,000 per person, per IRS Notice 2025-67.
Because the money never enters adjusted gross income, a QCD can help keep MAGI below IRMAA thresholds and the senior deduction phaseout in a way an itemized deduction cannot. That edge grows in 2026, since itemized charitable deductions now face a floor of 0.5% of AGI. The transfer must go directly from the custodian to the charity, and donor-advised funds and private foundations aren’t eligible recipients. Submit requests early, because processing can take weeks and a gift initiated in late December may not be completed in time.
Harvest Gains or Losses With Purpose
Taxable accounts offer their own year-end opportunities. Retirees in lower brackets may qualify for the 0% long-term capital gains rate, which allows them to realize gains and reset cost basis at little or no federal tax. Those in higher brackets can harvest losses to offset gains, deducting up to $3,000 of excess losses against ordinary income and carrying the rest forward. Be mindful of the wash-sale rule when repurchasing similar holdings. Realized capital gains and other investment income also add to MAGI, so they belong in the same projection as your conversions and IRMAA review.
Year-End Mistakes That Undermine Retirement Tax Planning
The errors we see most often have less to do with technical rules and more to do with timing and coordination.
- Treating each move in isolation. A conversion, a capital gain, and an RMD can each look reasonable alone and still combine to cross an IRMAA tier.
- Waiting until the last week of December. Custodian cutoffs and processing delays can turn a sound plan into a missed one.
- Overlooking estimated tax payments. Large conversions or gains may require added withholding or a January estimated payment to avoid an underpayment penalty.
- Ignoring the surviving spouse. Moving from joint to single brackets after a spouse dies can raise taxes on the same income, and planning ahead can soften that shift.
- Letting taxes drive investment decisions. Your allocation, risk tolerance, and long-term retirement strategy should still lead.
How RIA Advisors Approaches Retirement Tax Strategies
At RIA Advisors, tax planning is part of the financial plan from the start, never a separate scramble in December. As fiduciaries, our advisors are obligated to act in clients’ best interests, and that includes looking past this year’s tax bill to the full arc of retirement income and the retirement plan behind it.
A year-end review typically begins with a projection of the client’s 2026 income using actual figures to date. Next, we model the tax implications of a Roth conversion, a QCD, or a gain harvest across brackets, Social Security taxes, the senior deduction, and future IRMAA tiers. We coordinate with each client’s tax advisor and estate attorney so recommendations fit the tax return and the estate plan. Because our investment process is built on evidence and discipline instead of headlines, portfolio decisions and tax strategies get made together.
This article is educational and isn’t intended as individual legal or tax advice. Tax rules are complex and every tax situation is different, so review any strategy with a qualified tax advisor before acting. For official guidance, the IRS’s overview of the One Big Beautiful Bill Act’s provisions for seniors and its 2026 inflation adjustments are useful starting points.
Frequently Asked Questions
What is retirement tax planning?
Retirement tax planning is the process of managing when and how retirement income gets taxed. It coordinates withdrawals, Roth conversions, RMDs, Social Security, and charitable giving with the goal of lowering lifetime taxes instead of focusing on a single year.
What is the deadline for a Roth conversion in 2026?
A Roth conversion must be completed by December 31, 2026 to count as 2026 income. Unlike IRA contributions, conversions can’t be made after year-end and applied to the prior year. Many custodians set earlier cutoffs, so start in November.
Can a qualified charitable distribution satisfy my RMD?
Yes. A QCD made from an IRA by someone 70½ or older counts toward that year’s required minimum distribution. The amount is excluded from income, which can also help with Medicare IRMAA planning and the senior deduction phaseout.
How does Medicare IRMAA planning work?
IRMAA surcharges are based on modified adjusted gross income from two years earlier. Managing 2026 income through conversion sizing, gain timing, and QCDs can help keep 2028 Medicare premiums below the next threshold.
Do IRA withdrawals affect Social Security taxes?
They can. IRA withdrawals and Roth conversions raise provisional income, which may make more of your benefits taxable, up to 85%. Coordinating withdrawals around those thresholds is a core part of tax planning for retirement.
Should I take my first RMD this year or wait until April?
Waiting until April 1 is allowed, but it means taking two RMDs in one tax year. Comparing both scenarios is part of good RMD planning, since doubling income can raise your bracket and trigger IRMAA.
Are Roth IRA withdrawals tax free in retirement?
Qualified Roth IRA withdrawals are tax free once you’re 59½ and the account has been open at least five years. Because they don’t add to taxable income, they can help manage your tax bracket, Social Security taxes, and IRMAA in high-spending years.
Putting Your Plan Into Action
The weeks before December 31 are when retirement tax planning turns into real results. A careful look at RMDs, conversions, charitable giving, and Medicare thresholds can help lower taxes over time while keeping your retirement funds working toward the goals you set. If you’d like a second set of eyes on your year-end moves, our fiduciary advisors can help you weigh the numbers and coordinate with your tax professional.
Schedule a Consultation with an RIA Advisors fiduciary to review your retirement tax strategies before year-end.