Converting to a Roth IRA after retirement can lower the taxes you pay across the rest of your life, not just in the year you convert, by moving pre-tax IRA dollars into a tax-free Roth while your income is temporarily low. Retirees ask two questions: does it still make sense once the paychecks have stopped, and how much should I convert each year without triggering higher taxes, larger Medicare premiums, or more tax on Social Security. This guide answers both with the 2026 numbers.
Converting to a Roth IRA after retirement is allowed at any age, carries no income limit and no dollar cap, and is taxed as ordinary income in the year you convert (Source: IRS Pub 590-A/590-B, 2026). It is often more tax-efficient in the low-income years between the day you stop working and the year RMDs begin at 73, when you can convert at 10%, 12%, or 22% and pay the tax from a taxable account.
The decision comes down to your own income curve. If your traditional IRA is large enough that future required withdrawals will push you into higher brackets, converting some of it now, at today’s permanent 2026 rates, moves money out while your bracket is low. The sections below cover the timing, the brackets that size each year’s amount, and the effects on Medicare, Social Security, a surviving spouse, and your heirs.
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Why retirement is often a low-tax window to convert
The low-tax window for converting to a Roth IRA after retirement usually falls between the year you stop working and the year required minimum distributions begin at 73, roughly ages 60 to 72 (Source: SECURE 2.0, IRS Pub 590-B, 2026). In these “trough years” wages have stopped, and Social Security and RMDs have not yet started, so taxable income often dips into the 10%, 12%, or 22% brackets.
During your working years, wages already fill the higher brackets, so a conversion adds tax at your top rate. Once RMDs begin, the required withdrawals push income up on their own. A saver who retires at 62 and delays Social Security to 70 may have several years of unusually low taxable income, a stretch when converting a slice of the IRA each year can be done at a modest rate. Waiting until 73 often means converting on top of RMDs, Social Security, and any pension.
How the conversion is taxed
A Roth conversion is taxed as ordinary income on the pre-tax amount you move, at your marginal rate for that year (Source: IRS Pub 590-A, 2026). There is no separate conversion tax and no capital-gains treatment. The deadline is December 31 of the tax year, not the April filing date, and the conversion is irreversible for amounts converted after 2017. The conversion itself is not net investment income, though it raises your MAGI.
Because the converted amount stacks on top of your other income, sizing it starts from what you already expect to earn. A conversion is reported on Form 8606, and the custodian issues a Form 1099-R. The conversion is not itself subject to the 3.8% Net Investment Income Tax, but by lifting MAGI above $200,000 single or $250,000 MFJ it can pull other investment income into that tax, which our guide to the 2026 Net Investment Income Tax explains.
How much should you convert? The 2026 brackets
Bracket-filling means converting just enough to reach the top of your current marginal bracket without spilling into the next one. In 2026 the 22% bracket runs to $100,800 of taxable income for married filing jointly and $50,400 for single filers (Source: IRS Rev. Proc. 2025-32, 2026). Subtract your projected taxable income from a chosen ceiling, and the difference is roughly what you could convert at that rate.
Start from your projected taxable income for the year (pensions, interest, dividends, capital gains, and any taxable Social Security), subtract the 2026 standard deduction of $16,100 single or $32,200 MFJ (with $2,050 single or $1,650 per spouse added at age 65), then compare the result to the bracket ceilings below.
2026 federal income tax brackets, married filing jointly
For married couples filing jointly in 2026, the 12% bracket ends at $100,800 of taxable income and the 22% bracket runs to $211,400. Many retirees size a conversion to reach the top of the 12% or 22% band, since the wider joint brackets leave more room to convert at a modest rate than single filers have in the same year.
| Rate | Taxable income (MFJ) |
|---|---|
| 10% | Up to $24,800 |
| 12% | $24,801 to $100,800 |
| 22% | $100,801 to $211,400 |
| 24% | $211,401 to $403,550 |
| 32% | $403,551 to $512,450 |
| 35% | $512,451 to $768,700 |
| 37% | $768,701 and up |
2026 federal income tax brackets, single filer
For single filers in 2026, the 12% bracket ends at $50,400 of taxable income and the 22% bracket runs to $105,700, roughly half the joint width. A widowed or single retiree therefore fills each bracket faster, which is one reason many couples convert more while both spouses are alive and the wider joint brackets still apply.
| Rate | Taxable income (single) |
|---|---|
| 10% | Up to $12,400 |
| 12% | $12,401 to $50,400 |
| 22% | $50,401 to $105,700 |
| 24% | $105,701 to $201,775 |
| 32% | $201,776 to $256,225 |
| 35% | $256,226 to $640,600 |
| 37% | $640,601 and up |
The right ceiling is rarely the same every year. Many planners fill the 12% bracket in the leanest years and stretch into 22% or 24% when a later RMD spike or a survivor’s narrower brackets would otherwise cost more. Our guide on how much to convert to a Roth works through sizing each year.
There is no age, income, or dollar limit
Unlike Roth contributions, a conversion has no income limit and no dollar cap, and it does not require earned income (Source: IRS Pub 590-A, 2026). You can convert at 60, 73, or 85, and you can convert any amount, from a few thousand dollars to an entire IRA, in a single year. Roth contributions, by contrast, phase out at $153,000 to $168,000 of MAGI for single filers in 2026.
This is why high earners locked out of Roth contributions can still convert, and why a retiree with no wages can convert freely. The practical limit is not a rule but the tax bill, so most retirees convert only enough to fill a target bracket.
Converting now shrinks future RMDs
Every dollar you convert leaves the traditional IRA, so it never counts toward a future required minimum distribution. RMDs begin at age 73 for those born 1951 to 1959 and at 75 for those born in 1960 or later (Source: SECURE 2.0, IRS Pub 590-B, 2026). A smaller pre-tax balance at 73 means smaller forced withdrawals, and a Roth IRA carries no RMD during the original owner’s lifetime.
RMDs are why many well-funded retirees face rising taxes in their seventies: a large traditional IRA can generate required withdrawals well above what the household spends, dragging Social Security and Medicare up with it. Converting during the trough years reduces the balance those RMDs are calculated on. Review the current thresholds on our 2026 required minimum distributions page. Once you are subject to an RMD, it cannot itself be converted.
Medicare IRMAA and the two-year lookback
A conversion raises your modified adjusted gross income, which can trigger the Income-Related Monthly Adjustment Amount (IRMAA), a surcharge on Medicare Part B and Part D. IRMAA uses a two-year lookback, so a conversion done in 2026 can raise your premiums in 2028 (Source: CMS, 2026). Surcharges begin above $109,000 of MAGI single or $218,000 MFJ, and the tiers are cliffs, not gradual phase-ins.
Because each tier is a cliff, going one dollar over a threshold raises the premium for the whole year, so conversion planning from about age 63 watches these lines closely. A conversion before age 63 generally does not affect Medicare, since Part B typically starts at 65 and the lookback reaches back two years, making 62 the last conversion year that does not touch a premium.
| 2026 MAGI, single | 2026 MAGI, married filing jointly | Monthly Part B premium (per person) |
|---|---|---|
| $109,000 or less | $218,000 or less | $202.90 |
| $109,001 to $137,000 | $218,001 to $274,000 | $284.10 |
| $137,001 to $171,000 | $274,001 to $342,000 | $405.80 |
| $171,001 to $205,000 | $342,001 to $410,000 | $527.50 |
| $205,001 to $499,999 | $410,001 to $749,999 | $649.20 |
| $500,000 and up | $750,000 and up | $689.90 |
Roth conversions and Social Security taxation
Up to 85% of Social Security benefits can become taxable once “provisional income” crosses federal thresholds (Source: IRS Pub 915, 2026). A conversion raises provisional income, so converting in the same year you collect benefits can pull more of those benefits into the taxable zone. Converting before you claim Social Security, during the trough years, sidesteps that overlap.
This is one reason the delay-Social-Security-and-convert-early sequence is common. In years before benefits start, there is more room to convert without the conversion also taxing your benefits. Once benefits begin, each converted dollar can carry a hidden cost as it drags more of your Social Security into taxable territory, an effect often called the tax torpedo.
The widow’s penalty: convert while both spouses are alive
When one spouse dies, the survivor usually files as single the following year. Single brackets are roughly half as wide as joint brackets and the IRMAA thresholds are lower, so the same income is taxed harder. This “widow’s penalty” is a reason many couples convert more while both are alive and filing jointly (Source: IRS Rev. Proc. 2025-32, 2026).
A surviving spouse with a large traditional IRA can face RMDs taxed in single brackets while crossing IRMAA thresholds that were comfortable as a couple. Converting during the joint-filing years, when the 22% bracket reaches $211,400 of taxable income rather than the single ceiling of $105,700, moves pre-tax money out while the wider brackets and higher IRMAA thresholds still apply.
What OBBBA changed for 2026
The One Big Beautiful Bill Act (P.L. 119-21, July 2025) made the 10% through 37% rates permanent, so the brackets no longer sunset (Source: IRS, 2026). It also added a temporary senior deduction of up to $6,000 per person age 65 and older for 2025 through 2028, which phases out above $75,000 of MAGI single and $150,000 MFJ.
Two things follow. First, the old “convert before rates rise” urgency is gone, so timing now turns on your own income curve, not a legislative deadline. Second, the senior deduction phases out at 6 cents per dollar of MAGI above the threshold, so a converted dollar in the phase-out range costs its bracket rate plus the value of the deduction it erases, a hidden marginal-rate bump worth modeling before a large conversion.
Mechanics you cannot get wrong
Two rules protect the value of a conversion: pay the tax from outside funds, and mind the five-year rule. Covering the tax from a taxable brokerage account keeps the full converted amount growing tax-free, while withholding it from the IRA shrinks the balance and can add a 10% penalty before age 59.5 (Source: IRS Pub 590-B, 2026). Each conversion also starts its own five-year clock.
- Pay the tax from outside the IRA. Using taxable brokerage cash to pay the bill keeps every converted dollar in the Roth. Using IRA money reduces the very balance you are trying to move and can trigger a penalty before 59.5.
- The five-year rule. Each conversion has its own five-year clock from January 1 of the conversion year. Withdrawing the converted principal within five years and before age 59.5 can trigger the 10% early-distribution penalty, so many savers avoid converting money they expect to need within five years.
- The pro-rata rule. If you hold both pre-tax and after-tax dollars across your traditional, SEP, and SIMPLE IRAs, you cannot convert only the after-tax basis; the taxable share is figured across the combined balance on Form 8606.
Passing a tax-free Roth to your heirs
Under the SECURE Act, most non-spouse heirs must empty an inherited IRA within 10 years (Source: IRS Pub 590-B, 2026). Inherited traditional IRA withdrawals are taxable, often during the heir’s peak earning years, while an inherited Roth passes tax-free and lets the beneficiary withdraw across the 10-year window without adding to their taxable income.
For households with more than they expect to spend, converting can shift the tax bill from a high-bracket heir to the retiree’s own lower-bracket trough years. The 2026 federal estate and gift exemption is $15,000,000 per person, so for most families the legacy question is income tax on inherited dollars, not estate tax, and a Roth balance arrives income-tax-free.
How to convert to a Roth after retirement: step by step
Use these steps to estimate a per-year conversion amount that folds in the second-order effects. This is educational, not advice; run it on your own 2026 figures. The goal is one net number that reflects taxes, Medicare, Social Security, and your legacy goals at once, rather than optimizing a single variable in isolation.
- Project taxable income for the year before any conversion, then subtract the 2026 standard deduction ($16,100 single or $32,200 MFJ, plus the age-65 addition).
- Pick a target bracket ceiling from the 2026 tables above and subtract your projected taxable income from it. That difference is your starting conversion room at that rate.
- Check the IRMAA lines if you are 63 or older: compare projected MAGI plus the conversion to the $109,000 single or $218,000 MFJ threshold and trim if it crosses a cliff you are unwilling to pay.
- Check Social Security. If benefits have started, expect part of the conversion to increase the taxable share of those benefits; reduce the amount, or convert before you claim.
- Confirm the tax comes from outside funds. If you would need IRA money to pay it, lower the conversion until outside cash covers the bill.
- Weigh the survivor and heir angles, then convert before December 31 and report it on Form 8606. You can pressure-test the trade-off with our Roth conversion break-even analysis.
How Q3 Advisors approaches Roth conversion planning
Q3 Advisors is a registered investment adviser and fiduciary focused on retirement tax planning that sells no financial products. The firm approaches conversions as a multi-year cadence rather than a one-off transaction, and its Form ADV is filed with the SEC and available through the Investment Adviser Public Disclosure (IAPD) database.
Retirees comparing a planner for this work often weigh fiduciary status, how fees are charged (a flat fee versus a percentage of assets), whether products are sold, and where to find the Form ADV. Craig Wear, CFP, built the firm’s Roth conversion practice around multi-year planning, and his background is set out on his author and advisor profile. This description is factual and is not a testimonial or a claim about results.
Work with Q3 Advisors
Q3 Advisors is a registered investment adviser focused on retirement tax planning. This page is educational and is not advice; consult a qualified professional.
Frequently asked questions
Is it a good idea to convert an IRA to a Roth after retirement?
Converting an IRA to a Roth after retirement is often worthwhile during the low-income years between the day you stop working and the year RMDs begin at 73, because income has usually dropped into lower brackets (Source: IRS Pub 590-B, 2026). It fits savers who can pay the tax from outside funds, will not need the converted money within five years, and expect large future RMDs.
How much tax will I pay if I convert my IRA to a Roth?
A conversion is taxed as ordinary income at your marginal rate for the year, with no separate conversion tax. In 2026 that is 10% to 37%, depending on where the converted amount lands on top of your other income (Source: IRS Rev. Proc. 2025-32, 2026). As a rough illustration, a $50,000 conversion that stays inside the 22% bracket adds about $11,000 of federal tax.
At what age is it too late to convert an IRA to a Roth?
There is no maximum age, and it is rarely too late to convert an IRA to a Roth (Source: IRS Pub 590-A, 2026). You can convert at 60, 73, or 85. Once RMDs begin at 73 (75 if you were born in 1960 or later), you must take that year’s required distribution first, and an RMD itself cannot be converted.
Do you have to wait 5 years for each Roth conversion?
Each conversion starts its own five-year clock, running from January 1 of the conversion year (Source: IRS Pub 590-B, 2026). If you withdraw the converted principal within five years and before age 59.5, the 10% early-distribution penalty can apply to that amount. Once you are past age 59.5, the per-conversion five-year rule no longer triggers that penalty.
How do I avoid or reduce taxes on a Roth IRA conversion?
You cannot avoid the tax entirely, but you can reduce it: convert during low-income years, fill only your current bracket, spread conversions across several years, and convert before claiming Social Security so the conversion does not also tax your benefits (Source: IRS Pub 915, 2026). Paying the tax from a taxable account rather than the IRA keeps more money invested.
How much can you convert to a Roth IRA in one year?
There is no dollar limit and no income limit on Roth conversions, unlike the $7,500 Roth contribution cap for 2026 (Source: IRS Pub 590-A, 2026). You can convert any amount, even an entire IRA, in a single year. Most planners convert only enough to fill a target bracket, because the whole amount is taxed as ordinary income that year.
