How Much Can You Roll Over Into a Roth IRA: Limits and Taxes

There is no dollar limit on how much you can roll over into a Roth IRA. Federal law explicitly excludes qualified rollover contributions from the annual IRA contribution cap, so a single-year move of $50,000 or $5 million is permitted by the statute itself.¹ The real constraint is the tax bill on the converted pre-tax money, not a ceiling on the amount.

Why Rollovers Aren’t Capped Like Contributions

The annual contribution limit is what most people have in mind when they ask about a cap. For 2026, the most you can contribute across all your traditional and Roth IRAs combined is $7,500, or $8,600 if you’re 50 or older.² That ceiling governs new money coming in from your paycheck or bank account.

Rollovers and conversions are different. They move funds that are already inside the retirement system from one account to another. The statute says a qualified rollover contribution “shall not be taken into account” for purposes of the contribution limit.¹ Whether your old 401(k) holds $30,000 or $3 million, you can convert the whole balance in a single transaction. And the income phaseouts that block direct Roth contributions above $168,000 (single) or $252,000 (married filing jointly) in 2026 don’t apply to conversions.² High earners can move money into a Roth through a conversion even when they can’t contribute to one directly.

The Real Limit Is the Tax Bill

The entire pre-tax portion of what you convert counts as ordinary income in the year you convert it. Roll $200,000 from a traditional 401(k) into a Roth IRA and you add $200,000 to that year’s taxable income.³ That can push you into a higher marginal bracket, trigger phaseouts on other deductions and credits, and raise your Medicare premiums two years later through the income-related monthly adjustment amount (IRMAA).

The absence of a dollar cap can work against you here. Converting everything at once may mean paying 32% or 37% on income that would have been taxed at 22% or 24% if spread over several years. Many people handle large balances by converting smaller amounts each year, taking just enough to fill up their current bracket without spilling into the next one. Nothing in the rules forces you to convert all at once, and the IRS lets you do as many conversions in a single year as you want.

Amounts that were already taxed — after-tax contributions to a traditional IRA, or the Roth portion of a designated Roth account — aren’t taxed again on conversion.

The Pro-Rata Rule Decides How Much Is Taxable

If your traditional IRAs hold a mix of pre-tax and after-tax money, you can’t convert only the after-tax slice. The IRS applies a pro-rata rule that treats every dollar leaving your traditional IRAs as a proportional blend of taxable and non-taxable money.⁴

Here’s how it works. Suppose you have $80,000 in pre-tax funds and $20,000 in non-deductible contributions across all your traditional IRAs, for a total of $100,000. Convert $20,000 and the IRS won’t accept that it came entirely from the after-tax bucket. Because 80% of your total IRA balance is pre-tax, 80% of every converted dollar is taxable. So $16,000 of the conversion is taxable income and only $4,000 is tax-free.

The calculation looks at the aggregate of all your traditional, SEP, and SIMPLE IRA balances as of December 31 of the conversion year. You report it on Form 8606, which tracks your non-deductible IRA basis.⁵ Failing to file it when required carries a $50 penalty, and the bigger risk is losing track of your basis and paying tax twice on the same money.

Which Accounts Can Feed a Roth IRA

Not every account is eligible. The IRS rollover chart lists the sources that can move money into a Roth IRA:⁶

Traditional IRA. The most common conversion path; pre-tax contributions and earnings become taxable on conversion.
SEP-IRA. Treated the same as a traditional IRA for rollover purposes.
401(k) and other qualified plans, including profit-sharing and money purchase plans.
403(b) plans, common for teachers, hospital employees, and nonprofit workers.
Governmental 457(b) plans for state and local government employees.
Designated Roth accounts (Roth 401(k), Roth 403(b), Roth 457(b)), which roll in without additional tax because the funds were already taxed going in.
SIMPLE IRAs, but only after two years of participation in the plan. Roll a SIMPLE IRA into a Roth before that two-year mark and the IRS treats it as a withdrawal and applies a 25% additional tax on top of ordinary income tax.⁷

Money in a regular brokerage account, savings account, or any other non-retirement account cannot be rolled over. Depositing those funds into a Roth IRA counts as a new contribution and is subject to the annual limit and the income restrictions.³

What You Can’t Roll Over

Two boundaries matter even inside eligible accounts.

Required Minimum Distributions

If you’re old enough to take required minimum distributions from a traditional IRA or employer plan, the RMD portion of any distribution is not eligible for rollover. Federal regulations exclude any amount that is a required minimum distribution from the definition of an eligible rollover distribution.⁸ Take the RMD first, pay tax on it, and only then convert amounts above the RMD.

Excess Contribution Penalty

Any amount that ends up in a Roth IRA when it shouldn’t — an RMD rolled over by mistake, or money from a non-retirement account mischaracterized as a rollover — counts as an excess contribution. The IRS imposes a 6% excise tax on excess amounts for every year they remain in the account. To avoid the recurring penalty, withdraw the excess and any earnings it generated before your tax return due date, including extensions.⁹

Direct vs. Indirect Rollovers

How the money physically moves affects how much actually reaches your Roth.

Direct Rollover

In a direct (trustee-to-trustee) rollover, your old plan sends the funds straight to your new Roth IRA custodian. You never touch the money. No withholding, no 60-day pressure, no chance of accidentally turning a rollover into a taxable distribution. If you have the option, go direct.

Indirect Rollover

An indirect rollover puts the check in your hands first. You then have 60 days to deposit the full amount into your Roth IRA.¹⁰ Miss the deadline and the entire distribution is taxable, plus a 10% early withdrawal penalty applies if you’re under 59½.¹¹

Withholding is the piece that catches people. When you take an indirect distribution from an employer-sponsored plan like a 401(k), 403(b), or governmental 457(b), the plan must withhold 20% for federal taxes before cutting the check.¹⁰ On a $100,000 distribution you receive $80,000. To roll the full $100,000 and avoid tax on the withheld portion, you have to make up the $20,000 from other funds within the 60 days. You’ll get the withheld amount back when you file, but you’re out of pocket until then. Distributions from traditional IRAs are not subject to the mandatory 20%; the default is 10% voluntary withholding that you can opt out of.

The Once-Per-Year Rule

Indirect IRA-to-IRA rollovers carry another limit: generally one per 12-month period. If you take a distribution from one IRA and roll it over within 60 days, you can’t do another 60-day rollover from the same IRA or to the same IRA for 12 months.¹⁰ Break the rule and the second rollover becomes a taxable distribution plus an excess contribution. This limitation does not apply to direct trustee-to-trustee transfers or to Roth conversions. You can do multiple direct rollovers or multiple conversions in the same year.

The Five-Year Clock on Converted Amounts

Getting money into a Roth is only half the answer. Each conversion starts its own five-year waiting period, separate from the five-year rule that applies to regular Roth contributions.

Withdraw converted amounts before the five years are up while you’re still under 59½ and you owe a 10% early withdrawal penalty on the portion that was previously untaxed.¹ Once you reach 59½, the age-based penalty exception applies and the conversion five-year rule stops mattering for penalty purposes. The clock starts on January 1 of the tax year of the conversion, so a December 2026 conversion is treated as starting January 1, 2026, with the five years ending on January 1, 2031.

Roth withdrawals follow a fixed order: regular contributions first, then conversion amounts (oldest first), then earnings. Regular contributions come out tax-free and penalty-free at any time, so many people can access those without touching converted money. Earnings come out last and are fully tax-free and penalty-free only once you’re both 59½ and have had any Roth IRA open for at least five tax years.

1
Office of the Law Revision Counsel. 26 USC 408A Roth IRAs
2
Internal Revenue Service. 401(k) Limit Increases to $24,500 for 2026, IRA Limit Increases to $7,500
3
Internal Revenue Service. Publication 590-A (2025), Contributions to Individual Retirement Arrangements (IRAs)
4
Internal Revenue Service. Rollovers of After-Tax Contributions in Retirement Plans
5
IRS.gov. 2025 Instructions for Form 8606 – Nondeductible IRAs
6
IRS.gov. Rollover Chart
7
Internal Revenue Service. SIMPLE IRA Withdrawal and Transfer Rules
8
eCFR. 26 CFR 1.402(c)-2 – Eligible Rollover Distributions
9
Internal Revenue Service. Retirement Topics – IRA Contribution Limits
10
Internal Revenue Service. Rollovers of Retirement Plan and IRA Distributions
11
Internal Revenue Service. Topic No. 413, Rollovers From Retirement Plans