The roth conversion break even is the point where a Roth account’s tax-free growth recovers the income tax you paid to convert, and reaching it depends on three things: the rate you pay now, the rate you would have paid later, and how long the money compounds. Most people search this question wanting two answers at once, how many years until it pays back, and whether it is worth doing at all. This guide answers both.
A Roth conversion break even is the point where a Roth’s tax-free growth recoups the tax paid to convert. Under the 2026 brackets a married couple can convert within the 24% rate up to $403,550 of taxable income (Source: Rev. Proc. 2025-32). When the tax is paid from outside funds and the future withdrawal rate is at or above today’s, break even can be nearly immediate; when the future rate is lower, illustrative math shows it may take 10 to 30-plus years.
What “break even” means for a Roth conversion
Break even is the moment the after-tax value of converting overtakes the after-tax value of leaving the money in a traditional IRA. A Roth conversion moves pre-tax dollars into a Roth IRA and makes them taxable in the conversion year, except for any nondeductible basis (Source: IRS Pub 590-A, 2025). You spend tax dollars today to buy decades of tax-free growth, and break even measures when that trade turns positive.
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The cost is real and immediate, while the benefit is deferred: it depends on returns you have not earned yet and a tax rate you will face years from now (Source: IRS Pub 590-B, 2025). Break-even analysis is the arithmetic that lines those two up. It also deserves care because conversions made in 2018 or later cannot be recharacterized, meaning the decision is irreversible once done (Source: IRS Pub 590-A, 2025, under IRC section 408A).
The two questions searchers blend: years and the break-even tax rate
Most guides answer only one half of the question. Time-based pieces tell you a break-even “age” without showing the math; tax-rate pieces compute a break-even tax rate but wave off the “how many years?” question. The two are connected: the number of years to break even is a function of the gap between your conversion rate and your future rate, plus your rate of return.
Here is the bridge. If you pay the conversion tax from outside (taxable) funds and your future withdrawal rate is at or above your conversion rate, the after-tax Roth path and the traditional path can reach parity almost immediately, so years to break even can be close to zero. The years stretch out when you expect a lower future rate, where the question becomes whether tax-free compounding offsets that rate difference over time. The rest of this guide addresses both framings in that order.
Roth conversion break even in years: a plug-and-play table
Years to break even grows as your expected future tax rate falls below your conversion rate, and shrinks as your return rises. The table below is illustrative arithmetic on a $100,000 conversion at a 24% current rate, assuming the tax is paid from a taxable account earning the same return with roughly a 15% annual tax drag. It is a hypothetical model, not a projection of any actual result.
| Future rate vs. conversion rate | 4% return | 6% return | 8% return |
|---|---|---|---|
| Same or higher | ~1 year | ~1 year | ~1 year |
| 2 points lower | 16 years | 11 years | 8 years |
| 3 points lower | 24 years | 16 years | 12 years |
| 4 points lower | 32 years | 22 years | 17 years |
| 5 points lower | 41 years | 28 years | 21 years |
Source: illustrative arithmetic by Q3 Advisors using the taxation mechanics in IRS Pub 590-A and 590-B (2025); not a forecast. Read it by mapping your age to the result. In this illustrative table, a hypothetical 65-year-old who expects a rate 3 points lower and a 6% return reaches break even near age 81, and near age 89 at a 4% return. In illustrations like this one, a mid-retirement conversion often lands in the early-to-mid 80s, which is why the length of the time horizon carries weight.
The top row carries a key point: when your future rate is not lower than your conversion rate, break even can be near-immediate, and the years question largely falls away.
The break-even tax rate (BETR) and how it refines “will my rate be higher?”
The break-even tax rate is the future tax rate at which converting and not converting produce the same after-tax result. If the expected future rate is above the BETR, the model shows the conversion path producing the higher after-tax value; if it is below the BETR, the no-conversion path does. The BETR is often lower than the current marginal rate, so in the model a conversion can still come out even when the future rate drops slightly (as framed by Vanguard).
Why lower? When you pay the conversion tax from outside funds, you remove dollars that would otherwise have sat in a taxable account taxed on their growth every year. Shedding that tax drag is a factor the simple “will my rate be higher or lower?” rule ignores. In Vanguard’s published BETR illustration, an investor with an expected future rate of 24% has a break-even tax rate near 23.3%; in the model the conversion path is favored when the expected future rate is above that break-even (Source: Vanguard, “A BETR approach to Roth conversions,” 2025; illustrative).
The older rule of thumb, convert only if your future rate will be higher, is incomplete: it leaves out the tax-drag effect of paying from outside funds and the absence of lifetime required minimum distributions on Roth accounts (Source: IRS Pub 590-B, 2025). The BETR framework accounts for both.
The three drivers of the break-even
Three inputs determine every Roth conversion break even: the tax rate you pay to convert, the tax rate you expect on future traditional-IRA distributions, and your rate of return. Nothing else moves the result as much as these three, and they interact.
- Conversion tax rate. The rate you pay now, capped by which 2026 bracket the conversion income lands in. A lower conversion rate shortens break even.
- Future distribution rate. The rate you would have paid on traditional withdrawals or RMDs later. A higher future rate shortens break even; a lower one lengthens it.
- Rate of return. Faster tax-free compounding recovers the upfront tax sooner, which is why every column in the table above shrinks as returns rise.
Account size interacts with all three. Larger balances, combined with more outside wealth available to pay the tax, tend to widen the effect in the model, because more dollars compound tax-free and more taxable-account drag is avoided (as noted in third-party analyses).
Why paying the tax from outside funds changes the answer
Paying the conversion tax from outside (taxable) funds rather than from the IRA itself is one of the larger factors in the break-even math. When you pay from the IRA, you shrink the balance that compounds tax-free, and if you are under 59 and a half, the withheld amount is itself an early distribution subject to the 10% additional tax (Source: IRS Pub 590-B and Topic No. 558, 2025).
| Where the tax is paid | Break even if future rate is the same | Break even if future rate is lower |
|---|---|---|
| From outside (taxable) funds | Near-immediate | 10 to 30-plus years, per the table above |
| From inside the IRA | Near-immediate | May never break even; plus a possible 10% penalty under 59.5 |
Source: illustrative arithmetic by Q3 Advisors; penalty mechanics from IRS Pub 590-B and Topic No. 558 (2025). The point to note: paying from inside the IRA at a future rate lower than your conversion rate can mean the model never shows the conversion catching up, because you lose both the compounding base and the outside asset. This is why third-party analyses commonly treat outside-fund payment as close to a precondition.
Time horizon, longevity, and where it stops making sense
The length of the time horizon is what determines whether a break-even that lands later in retirement is reached within a person’s lifetime. If break even arrives around age 85 in the illustrative table and a person lives into their mid-90s, the Roth compounds tax-free for roughly a decade past that point; if they pass before break even, the conversion did not recover its tax cost for them (though heirs may still benefit). Third-party analyses commonly describe the strongest fit as someone with a long expected horizon.
There is no fixed age at which a conversion “stops making sense,” because the answer depends on the rate gap and return, not the calendar. A 72-year-old expecting a higher future rate and paying from outside funds can break even quickly, while a 60-year-old expecting a much lower future rate at a modest return may not. Roth accounts also strengthen the horizon math because the original owner never has to take required minimum distributions, so the balance can compound tax-free for life (Source: IRS Pub 590-B, 2025).
The 2026 tax landscape and why timing matters
The 2026 bracket schedule sets the ceiling on your conversion rate, so it defines how much you can convert within a given rate before spilling into the next one. The figures below come from Rev. Proc. 2025-32, which reflects the 2026 inflation adjustments including One Big Beautiful Bill amendments.
| 2026 marginal rate | Single taxable income | Married filing jointly |
|---|---|---|
| 12% | $12,400 to $50,400 | $24,800 to $100,800 |
| 22% | $50,400 to $105,700 | $100,800 to $211,400 |
| 24% | $105,700 to $201,775 | $211,400 to $403,550 |
| 32% | $201,775 to $256,225 | $403,550 to $512,450 |
| 35% | $256,225 to $640,600 | $512,450 to $768,700 |
Source: Rev. Proc. 2025-32 (2026). The 2026 standard deduction is $16,100 for single filers and $32,200 for married filing jointly (Source: Rev. Proc. 2025-32). A common approach is to size a conversion so it fills the rest of a target bracket without tipping into the next, since each bracket boundary is a rate cliff that raises the conversion cost.
Hidden costs that push the break-even later
Conversion income does not sit in a vacuum; it stacks on top of your other income and can trigger surcharges that the simple break-even math omits. The three that most often move the break-even later are Social Security taxation, Medicare IRMAA surcharges, and the 5-year rules.
Conversion income raises MAGI and can push more of your Social Security benefits into taxation, up to a maximum of 85% of benefits, at combined-income thresholds that are not inflation-indexed (Source: SSA and IRS Pub 915, 2025). For deeper mechanics, see the Social Security tax torpedo.
Medicare’s IRMAA surcharge uses your MAGI from two years earlier, so a 2026 premium is set by your 2024 tax return, and a large conversion can lift premiums for a full year two years out (Source: SSA POMS HI 01101.020, 2025). The 2026 tiers below show the jump.
| 2026 MAGI (single) | 2026 MAGI (married filing jointly) | Total monthly Part B |
|---|---|---|
| $109,000 or less | $218,000 or less | $202.90 (no surcharge) |
| Over $109,000 to $137,000 | Over $218,000 to $274,000 | $284.10 |
| Over $137,000 to $171,000 | Over $274,000 to $342,000 | $405.80 |
| Over $171,000 to $205,000 | Over $342,000 to $410,000 | $527.50 |
| Over $205,000 to $500,000 | Over $410,000 to $750,000 | $649.20 |
Source: SSA POMS HI 01101.020 (effective 2026, based on 2024 MAGI); standard 2026 Part B premium $202.90 per CMS (2025). A single filer whose conversion lifts 2024 MAGI from $108,000 to $138,000 could move from the $202.90 tier to the $405.80 tier, roughly $2,435 more in Part B premiums across 2026, on top of the conversion tax. See the 2026 IRMAA brackets for the full schedule.
Finally, two 5-year rules bear on the break-even. A converted amount withdrawn within five years of the conversion, before age 59 and a half, can trigger the 10% additional tax on the previously taxed amount (Source: IRS Pub 590-B, 2025). Roth distributions also follow ordering rules, contributions first, then conversions, then earnings, which affects how early withdrawals are taxed (Source: IRS Pub 590-B, 2025).
The low-income conversion window and RMDs
The years between retiring and the start of Social Security and required minimum distributions are often the lowest-income years of a retirement, which can make them a common window to convert at a lower rate (as noted in third-party analyses). Once RMDs begin, they add taxable income you cannot avoid, which can raise the very future rate the break-even math is trying to beat.
RMDs from traditional IRAs currently begin at age 73, and rise to 75 for those born in 1960 or later beginning in 2033, and a Roth conversion done before RMDs begin reduces the traditional balance that RMDs are calculated on (Source: SECURE 2.0 Act of 2022, sec. 107; IRS). Because Roth IRAs carry no lifetime RMDs for the original owner, converting can lower future forced income; see the detail on required minimum distributions for 2026. One reframing is useful here too: the full traditional balance is not entirely yours, since a share is owed in tax, so it can help to compare tax-adjusted dollars rather than gross balances.
Work with Q3 Advisors
Q3 Advisors is a registered investment adviser focused on retirement tax planning. This article is educational and is not advice; for guidance on your own circumstances, consult a qualified tax or financial professional.
Frequently asked questions
How long does it take to break even on a Roth conversion?
It depends on the gap between your conversion rate and future rate, your return, and where the tax is paid. When the tax comes from outside funds and your future rate is at or above today’s, break even can be near-immediate. When the future rate is lower, illustrative math shows roughly 10 to 30-plus years, longer at lower returns (Source: illustrative arithmetic; IRS Pub 590-A/B, 2025).
Is a Roth conversion worth it after age 60?
Age alone does not determine it. What bears on the answer is the rate gap, expected return, the time horizon, and whether the tax is paid from outside funds. In the model, someone expecting a higher or equal future rate and paying tax from a taxable account can break even quickly, while someone expecting a much lower future rate at a low return may take decades (as framed by Vanguard; not advice).
At what age does a Roth conversion no longer make sense?
There is no fixed cutoff age, because the outcome tracks the time horizon and the rate gap, not the calendar. In illustrative tables, break-even ages often land in the early-to-mid 80s, so a shorter life expectancy narrows the window in which the conversion is recovered. The years-to-break-even table is a more concrete test than any single age (Source: IRS Pub 590-B, 2025).
What is the break-even tax rate for a Roth conversion?
The break-even tax rate (BETR) is the future rate at which converting and not converting give the same after-tax result. Above it, the model favors the conversion path; below it, it favors the no-conversion path. Because paying tax from outside funds sheds future tax drag, the BETR is often below your current rate, near 23.3% for an expected future rate of 24% in Vanguard’s illustration (Source: Vanguard, A BETR approach to Roth conversions, 2025; illustrative).
How do you calculate the break-even point on a Roth conversion?
Compare two after-tax paths over time: converting now versus leaving the money traditional and investing the tax dollars in a taxable account. Break even is the first year the Roth path’s after-tax value overtakes the other. The key inputs are conversion rate, future rate, return, and where the tax is paid (Source: IRS Pub 590-A/B, 2025). A calculator or adviser can run your own figures.
Should I pay Roth conversion taxes from my IRA or from outside funds?
The rules allow either, but paying from outside (taxable) funds keeps more dollars compounding tax-free and shortens break even. Paying from the IRA shrinks the growing balance, and if you are under 59 and a half the withheld amount is an early distribution subject to a 10% additional tax (Source: IRS Pub 590-B and Topic No. 558, 2025). This is educational, not a recommendation.
How many years should you leave money in a Roth after converting?
Under the conversion 5-year rule, a converted amount withdrawn before five years have passed and before age 59 and a half can trigger the 10% additional tax on the converted amount (Source: IRS Pub 590-B, 2025). Separately from that rule, a longer time horizon gives tax-free compounding more time to work in the break-even math.
Sources
IRS Publication 590-A (2025), Contributions to Individual Retirement Arrangements, irs.gov/publications/p590a. IRS Publication 590-B (2025), Distributions from IRAs, irs.gov/publications/p590b. IRS Topic No. 558 (2025), Additional Tax on Early Distributions, irs.gov/taxtopics/tc558. IRS Publication 915 (2025), Social Security and Equivalent Railroad Retirement Benefits, irs.gov/publications/p915. Rev. Proc. 2025-32 (2026 inflation adjustments), irs.gov. SSA, Income Taxes and Your Social Security Benefit, ssa.gov. SSA POMS HI 01101.020 (2026 IRMAA), secure.ssa.gov. CMS, 2026 Medicare Parts A and B Premiums and Deductibles (2025), cms.gov. Vanguard, A BETR approach to Roth conversions (2025), corporate.vanguard.com. SECURE 2.0 Act of 2022, sec. 107 (RMD age), congress.gov. Break-even year figures are illustrative arithmetic by Q3 Advisors and are not projections.
