By Income Tax Service Editorial — Reviewed by Diyan Yap, EA (IRS Enrolled Agent) — Updated July 20, 2026
Quick answer: A Roth conversion moves money from a traditional IRA or 401(k) into a Roth account. The converted amount is added to your taxable income for the year and taxed at your ordinary 2026 rates (10% to 37%). There is no income limit and no dollar cap on conversions — but once converted, qualified Roth withdrawals come out tax-free.
Key facts:
- A conversion is taxable as ordinary income in the year you convert, at 2026 bracket rates
- No income limit blocks who can convert — unlike direct Roth contributions, which phase out at higher incomes
- No dollar cap on how much you may convert in a year
- Once converted, qualified Roth withdrawals are tax-free
- The tax bill is the real constraint, so many people convert only enough to “fill up” their current bracket
A Roth conversion isn’t a contribution and isn’t limited by the annual IRA and 401(k) contribution limits. It’s a separate move with its own tax math — here’s how it works.
What happens when you convert a traditional IRA to a Roth?
When you convert, the dollars you move from a pre-tax traditional IRA or 401(k) into a Roth are added to your taxable income for that year and taxed at ordinary rates. You are essentially choosing to pay the tax now — while the money is in a traditional account it was never taxed, so conversion is when the IRS collects.
In exchange, that money is done being taxed. Qualified withdrawals from the Roth later are tax-free, and Roth accounts aren’t subject to the required minimum distributions that force money out of traditional accounts. The bet is simple: pay a known tax rate today to avoid an unknown, possibly higher, rate later.
Is there an income limit on Roth conversions in 2026?
No. There is no income limit on Roth conversions — anyone can convert, regardless of how much they earn. This is the key difference from direct Roth IRA contributions, which are phased out for higher earners. A conversion sidesteps that entirely, which is why high earners use conversions to get money into a Roth at all.
There is also no dollar cap. You could convert $5,000 or $500,000 in a single year — the law doesn’t limit the amount. What limits most people in practice is the tax bill, because a large conversion can push income into higher brackets.
How much tax will a 2026 Roth conversion cost?
The tax on a conversion equals the converted amount multiplied by the bracket rates it lands in, stacked on top of your other income. Because 2026 uses graduated brackets, the smart move is often to convert just enough to fill the rest of your current bracket without spilling into the next one.
Worked example: Nadia is single with $60,000 of taxable income in 2026, which sits in the 22% bracket. Here is where the 2026 single brackets sit:
| 2026 rate (single) | Taxable income where it applies |
|---|---|
| 12% | $12,400 – $50,400 |
| 22% | $50,400 – $105,700 |
| 24% | $105,700 – $201,775 |
The 22% bracket runs up to $105,700, so Nadia has $45,700 of room ($105,700 − $60,000) before she hits the 24% bracket. If she converts $40,000, all of it stays inside the 22% band:
- Converted amount: $40,000
- New taxable income: $60,000 + $40,000 = $100,000 (still under $105,700)
- Tax on the conversion: 22% × $40,000 = $8,800
Had Nadia converted $60,000 instead, the last chunk would spill past $105,700 and be taxed at 24%. Filling the bracket — not overfilling it — is the whole game.
When does a Roth conversion make sense?
A conversion tends to make sense when your tax rate today is lower than the rate you expect later. Classic windows include a low-income year, an early-retirement gap before Social Security and required distributions begin, or a year when large deductions temporarily push your taxable income down.
You qualify to consider one if:
- You hold pre-tax money in a traditional IRA or 401(k) you can convert.
- You have cash outside the retirement account to pay the resulting tax (paying from the conversion itself shrinks the benefit).
- Your current bracket has room before the next rate kicks in, or you expect higher rates ahead.
Conversely, if converting would spike you into a much higher bracket this year, or you’ll need the money soon, the math often argues for waiting or converting less.
How do other 2026 deductions affect your conversion?
Other deductions matter because a conversion stacks on top of taxable income — the number after deductions. Anything that lowers your taxable income in 2026 opens up more low-bracket room to convert into. A year with a large deduction is a natural conversion year.
For example, a taxpayer 65 or older who qualifies for the $6,000 senior deduction has that much more low-bracket space to work with. The reverse is also true: a big conversion raises your income, which can affect other income-tested items in the same year, so it’s worth modeling the whole return rather than the conversion alone.
What should you do now?
Conversions are a year-by-year decision, and 2026 is only settled once. Steps to take:
- Estimate your 2026 taxable income and find how much room is left in your current bracket before the next rate begins.
- Convert to fill the bracket, not overshoot it — the goal is to use up low-rate room, not to trigger the next tier.
- Set aside cash to pay the tax from outside the retirement account, so the entire converted balance keeps growing tax-free.
- Finish by December 31, 2026 for the conversion to count as a 2026 event — there’s no carry-back like there is for IRA contributions.
A credentialed tax professional — like an IRS Enrolled Agent — can model a “convert to the top of the bracket” plan against your full 2026 return before you pull the trigger.
FAQ
Is there an income limit on Roth conversions? No. Unlike direct Roth IRA contributions, which phase out at higher incomes, there is no income limit on converting a traditional IRA or 401(k) to a Roth. Anyone can convert regardless of what they earn.
How much can I convert in one year? There is no dollar cap on conversions. You can convert any amount you like — the practical limit is the tax bill, because the converted amount is added to your taxable income and taxed at your 2026 rates.
Will a Roth conversion push me into a higher tax bracket? It can. The conversion stacks on top of your other income, so a large conversion can spill into the next bracket. That’s why many people convert only enough to fill up their current bracket without crossing the next threshold.
When is the deadline to do a 2026 conversion? A conversion counts for the year the money actually moves. To have it taxed in 2026, the conversion must be completed by December 31, 2026 — there’s no extension into the following year like there is for IRA contributions.
Do I need cash outside the IRA to pay the conversion tax? Ideally yes. Paying the tax from separate savings lets the full converted balance grow tax-free in the Roth. If you instead have tax withheld from the conversion itself, that withheld portion can be treated as an early withdrawal with its own consequences.
Sources
This article is for educational purposes only and is not tax, legal, or financial advice. Tax rules change and individual situations vary — consult a qualified tax professional about your specific circumstances.