Converting an IRA to Roth after age 60: the window, the costs, the math

Converting an IRA to Roth after age 60: what changes at 59½

The mechanics of a conversion do not depend on age. Under IRC §408A(d)(3), the pre-tax amount moved from a traditional IRA to a Roth IRA is included in gross income for the year, with no income limit, age limit or annual cap. The Roth conversion pillar guide covers the general rules; this page focuses on what age adds.

Two things get easier past 59½. Distributions are no longer subject to the 10% additional tax under §72(t), so withholding tax from a conversion no longer triggers a penalty, and the per-conversion five-year rule, which exists only to recapture that penalty, no longer bites (IRS Publication 590-B). What gets harder is that income now feeds Medicare premiums, Social Security taxation and, for 2025 through 2028, an age-65 deduction that phases out with income. And RMDs start at 73 or 75, must come out before any conversion, and add to the stack you convert on top of.

The age map, 60 to 75

Ages below are the ages at which the conversion income is recognized, not the ages at which the consequence lands.

Each birthday after 62 adds a layer of cost to the same conversion dollar. Once earned income stops, 60 to 62 are usually the cheapest years available. The Roth conversion calculator models any of these ages against your own income.

IRMAA and the age-63 line

Medicare's income-related monthly adjustment amount uses the tax return from two years earlier; SSA states that 2026 premiums are based on 2024 income. Medicare starts at 65, so the first year whose income can raise your premiums is the year you turn 63. A conversion at 60, 61 or 62 cannot cause IRMAA. One at 63 can.

The 2026 tiers, from the CMS fact sheet of 14 November 2025, start at modified AGI above $218,000 for joint filers and $109,000 for single filers; the first surcharge tier takes the Part B premium from $202.90 to $284.10 a month and adds $14.50 for Part D. They are cliffs: one dollar over a threshold costs the full tier for the year. A conversion recognized in 2026 sets 2028 premiums, whose thresholds are unpublished; the example below uses the 2026 table as a labelled stand-in. See how to avoid IRMAA and MAGI for IRMAA for the mechanics, and the IRMAA calculator for the largest conversion that stays inside your tier. Keep it in proportion: IRMAA is a one-year surcharge, about $1,150 per person for the first tier across Parts B and D at 2026 rates, and the Roth dollars created never count toward it again.

Social Security taxation: who it actually affects

Under IRC §86, the taxable share of Social Security depends on provisional income: adjusted gross income excluding benefits, plus tax-exempt interest, plus half of benefits. Section 86(c) sets the base amount at $32,000 joint and $25,000 single, and the adjusted base amount at $44,000 and $34,000. Above the first, up to 50% of benefits is taxable; above the second, up to 85%. The statute contains no inflation adjustment, so these figures have stood since 1984 and 1994. IRS Publication 915 has the worksheets.

In the phase-in range, each extra dollar of conversion income can make $0.85 of benefits taxable as well, the "tax torpedo". It is mostly a middle-income problem: a married couple with $60,000 of combined benefits reaches the 85% cap at roughly $97,000 of provisional income, and most households weighing six-figure conversions are past that point before converting a dollar. The more relevant point for high earners is sequencing: delaying benefits to 70 keeps the years from 60 to 69 free of benefit income.

The senior deduction, 2025–2028

Pub. L. 119-21 §70103 added IRC §151(d)(5)(C): a deduction of $6,000 for each spouse aged 65 or older for tax years 2025 through 2028, available whether or not you itemize and claimed on Schedule 1-A. The statute reduces each $6,000 by 6% of modified AGI over $150,000 on a joint return ($75,000 otherwise). Because the reduction applies to each spouse's $6,000, a couple's combined $12,000 shrinks by 12 cents per dollar over $150,000 and is gone at $250,000 of MAGI; a single filer's is gone at $175,000. The IRS eligibility page confirms the amount, years and thresholds. For a couple converting at 65 or older the cost is bounded: at most $12,000 of lost deduction, worth $1,440 at 12% or $2,640 at 22%. For a 60-year-old today the deduction expires before they qualify, unless Congress extends it.

How much tax on a $50,000 conversion: a 60+ couple, layer by layer

Conversion income is added on top of everything else and taxed at whatever brackets it lands in. Start with taxable income before the conversion, find where it sits in the 2026 brackets (Rev. Proc. 2025-32), and fill upward. For joint filers in 2026 the 12% bracket runs from $24,800 to $100,800 of taxable income, 22% to $211,400 and 24% to $403,550; the standard deduction is $32,200.

* After the $32,200 standard deduction and whatever senior deduction the couple's MAGI allows before converting. Each $6,000 falls by 6% of MAGI over $150,000, so the conversion itself shrinks the deduction and the lost amount is taxed along with the $50,000.

Read across a row and the full cost appears: the $150,000 couple pays about $12,320 federal on the conversion, or 24.6%, not the 22% the bracket suggests, because the conversion also phases out $6,000 of their senior deduction. The Roth conversion calculator runs the same method for any amount and filing status.

Worked example: $200,000 at 60, 65 and 72

Take a married couple filing jointly with $80,000 of other ordinary income (pension and interest) and a traditional IRA large enough to convert $200,000 in one year. We price the same conversion at three ages using the 2026 federal brackets and $32,200 standard deduction. Assumptions: the age-65 additional standard deduction ($1,650 per spouse in 2026) is ignored so the base deduction is identical in each case; brackets are held at 2026 levels; IRMAA uses the 2026 table because the 2028 tiers are unpublished; no state tax; the senior deduction remains law through 2028.

• At 60: no Medicare, no Social Security yet, no senior deduction.
• At 65: both on Medicare, Social Security deferred to 70, senior deduction available.
• At 72: both claiming, with $60,000 of combined benefits, senior deduction available.

* $80,000 plus $51,000 of taxable benefits (85% of $60,000). Federal tax: without conversion, taxable income of $47,800 ($98,800 at 72) is taxed at 10% and 12%; with conversion, $247,800 ($298,800 at 72) runs through the 12%, 22% and 24% brackets. IRMAA: 2026 third tier for joint MAGI over $274,000 to $342,000 — $202.90 Part B surcharge plus $37.50 Part D surcharge a month, per person, times 12, times two. Senior deduction: without the conversion MAGI is under $150,000 and the full $12,000 is allowed, worth $1,440 at the couple's 12% marginal rate; with the conversion MAGI exceeds $250,000 and the deduction is zero.

The federal tax at 60 and 65 is identical; Medicare and the senior deduction make 65 dearer. The 72-year-old pays more because $51,000 of taxable benefits sits underneath the conversion, pushing more of it into 24%, while the Social Security torpedo adds nothing because the couple was already at the 85% cap. The table also understates the gap: the 60-year-old has 15 years to spread conversions before the first RMD; the 72-year-old, if born in 1954, has one.

After 70 and 72: the RMD-first rule

Under SECURE 2.0, the RMD age is 73 for people born 1951 through 1959 (1959 under IRS proposed regulations) and 75 for those born in 1960 or later; our RMD age guide has the birth-year table. Converting at 70 or 72 is still permitted; what changes is that the window without a required distribution underneath is closing.

Once RMDs begin, the IRS RMD FAQs confirm RMDs cannot be rolled over, and Treas. Reg. §1.408A-4, Q&A-6 says an RMD cannot be converted, with the first dollars distributed in an RMD year treated as the RMD. The RMD comes out first and is taxed; only then can additional dollars be converted (the first-year trap is covered in does a Roth conversion count as an RMD). Later conversions therefore stack on income you cannot avoid, while earlier ones shrink the balance RMDs are calculated on. Conversions must be completed by December 31; see the Roth conversion deadline guide.

The five-year rule after 60

There are two five-year rules, and after 59½ only one still matters. The conversion rule gives each conversion its own clock, but it exists only to apply the 10% penalty to converted principal withdrawn early, and that penalty does not apply after 59½. The qualified distribution rule in §408A(d)(2) still applies to earnings: they are tax-free only once five tax years have passed since 1 January of the year of your first contribution or conversion to any Roth IRA. Ordering rules send contributions and converted principal out first, both tax-free after 59½; earnings come last. If you have no Roth IRA yet, a small conversion this year starts the clock. Our five-year rule guide works through dated examples.

Paying the tax: outside funds versus withholding

After 59½ you may withhold tax from the conversion without penalty, but it is usually the weaker option. Converting $200,000 and withholding $40,000 puts $160,000 in the Roth while still taxing $200,000. Paying the $40,000 from a taxable account puts the full $200,000 in the Roth: in effect, an extra $40,000 moves from taxable to tax-free, past any contribution limit. The trade-off is the tax on raising the cash: selling appreciated securities adds capital gains, which also count toward IRMAA MAGI, so cash or high-basis positions are the cleaner source. Estimated payments may be needed to avoid an underpayment penalty. If the IRA has after-tax basis, part of the conversion is tax-free under the pro-rata rule; see Roth IRA basis and reporting a conversion on Form 1099-R.

Myths versus rules

The estate angle: heirs and the ten-year window

Most non-spouse beneficiaries who inherit an IRA from someone who died after 2019 must empty it within ten years, as the IRS RMD FAQs state; where the owner died after their required beginning date, final regulations also require annual distributions inside that window. An inherited traditional IRA therefore lands on the heirs' returns in a compressed period, often their peak earning years; an inherited Roth IRA follows the same ten-year rule, but tax-free (see inherited IRA RMD rules).

This reframes late conversions. A 72-year-old in the 24% bracket whose children will be in the 35% bracket when the ten-year clock runs is prepaying the family's tax at a discount. The question is not "will I live long enough to recoup the tax" but "who pays the tax on this account, and at what rate". It also argues for leaving pre-tax dollars to charity and Roth assets to individuals.

Decision rules by age band

No rule replaces modelling your own numbers, but these hold up across most situations:

• 60–62, before Medicare: if earned income has stopped and benefits are deferred, these are often the cheapest conversion years available. Test filling the 22% bracket as a baseline and the 24% bracket as the stretch case. If you buy marketplace coverage, check the premium-tax-credit effect first: the enhanced credits expired after 2025 and, unless Congress restores them, eligibility again ends at 400% of the federal poverty line, so a conversion can cost the whole credit.
• 63–64, the IRMAA lookback begins: size conversions to IRMAA tiers deliberately. Landing just under a threshold is cheaper than just over it; decide whether to accept a tier rather than drift into one.
• 65–72, Medicare and Social Security: add the senior-deduction phase-out (through 2028) and, once benefits start, the provisional-income test. Compare against your rate at RMD age, not today's: project the RMD at 73 or 75 plus Social Security plus other income, and if that lands in the same or a higher bracket, converting now is a gain. Price the surviving spouse too: a widow or widower files single with much of the same income at roughly half the bracket widths and IRMAA thresholds.
• 73 and after, RMD first: take the RMD, then decide whether to convert on top. Do not convert money headed to charity; from 70½, qualified charitable distributions move IRA dollars to charity without entering income (see the QCD limit guide). Late conversions are usually about heirs, not you.
• At every age: pay from outside funds when you can, avoid realizing large gains to do it, and let a planned move to a no-tax state argue for waiting. How to draw taxable, pre-tax and Roth accounts in these years is covered in tax-efficient withdrawal strategies; the Learn hub collects related guides.