How Much Can You Roll Over From a 401k to a Roth IRA?

There is no dollar limit on how much you can roll over from a 401(k) to a Roth IRA. You can move your entire vested balance in one transaction if you want to. What actually constrains the decision is taxes: every pre-tax dollar you convert is added to your taxable income for the year, so the practical ceiling is the tax bill you are willing to pay.

Why There Is No Cap

Federal law separates annual contributions from rollovers. For 2026, the Roth IRA contribution limit is $7,500 ($8,600 if you are 50 or older), and direct contributions phase out between $153,000 and $168,000 for single filers and between $242,000 and $252,000 for joint filers.¹ None of that applies here. The IRS states directly that the IRA contribution limit does not apply to rollover contributions.²

Under 26 U.S.C. § 402(c), an eligible rollover distribution from a qualified employer plan can be moved in full to a Roth IRA without a dollar ceiling.³ Someone with a $500,000 401(k) can convert all of it at once. The income phase-outs that restrict direct Roth contributions do not apply to conversions either, which is why high earners routinely use this route.

The Real Limit Is the Tax Bill

Rolling pre-tax 401(k) money into a Roth IRA is a taxable event. The converted amount is added to your gross income, and it can push you into a higher bracket. A single filer with $80,000 in taxable income who converts $50,000 ends up at $130,000. The 22% bracket for single filers in 2026 ends at $105,700, so a meaningful slice of that conversion is taxed at 24%.⁴

Your 401(k) plan reports the distribution on Form 1099-R for the year the conversion happens.⁵ You report the amount on the pensions and annuities line of Form 1040 and use Form 8606 to calculate the taxable portion.⁶

Splitting the Conversion Across Years

Because there is no cap and no requirement to convert everything at once, you can move a portion of your balance each year. Partial conversions let you control how much taxable income you pile on in any given year and can keep you in a lower bracket. A single filer in 2026 stays in the 22% bracket up to $105,700 and enters 24% above that, so sizing each year’s conversion to stop short of the next bracket threshold is a common approach.⁴

After-Tax Dollars in Your 401(k)

If your 401(k) balance includes after-tax (non-Roth) contributions, those dollars have already been taxed and are not taxed again at conversion. Each distribution generally must include a proportional share of pre-tax and after-tax money, so you cannot pull out only the after-tax portion.⁷ With a full distribution of the whole balance, you can direct the pre-tax portion to a traditional IRA and the after-tax portion to a Roth IRA, keeping the immediate tax hit down. Form 8606 tracks the nontaxable amounts so you are not taxed twice later.⁶

RMDs Come Out First

If you are 73 or older and still have money in a traditional 401(k), you must take required minimum distributions each year. RMD amounts cannot be rolled over.⁸ You have to satisfy the full RMD for the year before converting any additional amount, because the first dollars distributed in an RMD year are treated as RMD dollars.⁹

Anything above the RMD is fair game for conversion. Roth IRAs do not require minimum distributions during the owner’s lifetime, so converting traditional 401(k) money can eliminate future RMD obligations on the converted amount.⁸

Two Five-Year Clocks on Converted Money

Once the money is in the Roth, two separate five-year rules affect when you can take it out cleanly.

Five Years to Avoid the 10% Penalty on Converted Amounts

If you withdraw converted amounts before age 59½ and before five years have passed since that specific conversion, you owe a 10% early withdrawal penalty on the portion that was taxable at conversion. Each conversion has its own clock, starting January 1 of the year you convert.⁹ Convert $100,000 in 2026 and the clock runs through December 31, 2030. After age 59½, this penalty no longer applies regardless of when you converted.

Five Years for Tax-Free Earnings

A separate five-year period determines whether the earnings inside the Roth come out tax-free. To count as a qualified distribution, the withdrawal has to happen after you turn 59½ (or another qualifying event such as disability or death), and at least five tax years must have passed since your first contribution to or conversion into any Roth IRA.¹⁰ If you already have a Roth IRA older than five years, this clock is already satisfied and a new conversion does not restart it.

Costs the Conversion Can Trigger Later

Estimated Tax Payments

A direct rollover sends the full amount to your Roth IRA without withholding any taxes, so you owe the resulting income tax separately. The IRS expects quarterly estimated payments if you anticipate owing $1,000 or more beyond your withholding and refundable credits. To avoid an underpayment penalty, your total payments for the year need to equal at least the smaller of 90% of your current-year tax or 100% of last year’s tax. If your prior-year adjusted gross income exceeded $150,000 ($75,000 if married filing separately), the prior-year safe harbor rises to 110%.¹¹

Medicare Premium Surcharges

If you are on Medicare or close to eligibility, a Roth conversion can trigger income-related monthly adjustment amounts (IRMAA) that raise your Part B and Part D premiums. Medicare uses modified adjusted gross income from two years earlier, so a large 2026 conversion affects 2028 premiums. For 2026, the first IRMAA tier starts when individual income exceeds $109,000, or $218,000 for joint filers.¹² Because the conversion is added to your gross income, even a moderate one can push you across the first threshold if your other income is already close.

When a Full Rollover May Be the Wrong Move

Company Stock and Net Unrealized Appreciation

If your 401(k) holds employer stock that has grown significantly, rolling those shares into a Roth IRA is often not the best choice. Under the net unrealized appreciation rules in 26 U.S.C. § 402(e)(4), you can take a lump-sum distribution of the employer stock into a taxable brokerage account and pay ordinary income tax only on the original cost basis. The appreciation above basis is then taxed at long-term capital gains rates when you sell, regardless of your holding period after distribution.³ Rolled into a Roth instead, the whole value (basis plus appreciation) is taxed as ordinary income in the conversion year. For stock with substantial appreciation, NUA can save thousands. The election is only available as part of a lump-sum distribution of your entire plan balance.

Creditor Protection

While your money is in the 401(k), it has strong federal creditor protection under ERISA.¹³ Once it is in an IRA, federal bankruptcy protection still applies, but protection outside of bankruptcy varies by state. If lawsuits or creditor claims are a real concern, check your state’s IRA protection rules before moving a large balance out.

Direct vs. Indirect Rollover

How the money physically moves matters, because the two methods carry different withholding rules and deadlines.

Direct Rollover

In a direct rollover, your 401(k) plan sends the funds straight to your Roth IRA custodian. The check is made payable to the new institution for your benefit, and no federal taxes are withheld from the transfer.¹⁴ This is the simpler and safer method.

Indirect Rollover and the 60-Day Rule

In an indirect rollover, the plan sends the check to you. When that happens, the administrator is required to withhold 20% for federal income taxes.¹⁴ You then have 60 days to deposit the full original amount into your Roth IRA, including the 20% that was withheld, which you have to replace from other funds. Miss the 60-day window and the IRS treats the unredeposited amount as a taxable distribution, with a 10% early withdrawal penalty on top if you are under 59½.¹⁵

1
Internal Revenue Service. 401(k) Limit Increases to $24,500 for 2026, IRA Limit Increases to $7,500
2
Internal Revenue Service. Retirement Topics – IRA Contribution Limits
3
Office of the Law Revision Counsel. 26 USC 402 – Taxability of Beneficiary of Employees Trust
4
Internal Revenue Service. IRS Releases Tax Inflation Adjustments for Tax Year 2026
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Internal Revenue Service. About Form 1099-R
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Internal Revenue Service. Instructions for Form 8606
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Internal Revenue Service. Rollovers of After-Tax Contributions in Retirement Plans
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Internal Revenue Service. Retirement Plan and IRA Required Minimum Distributions FAQs
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Internal Revenue Service. Publication 590-B – Distributions From Individual Retirement Arrangements
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Office of the Law Revision Counsel. 26 USC 408A – Roth IRAs
11
Internal Revenue Service. Estimated Tax
12
Centers for Medicare & Medicaid Services. 2026 Medicare Parts A and B Premiums and Deductibles
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U.S. Department of Labor. FAQs About Retirement Plans and ERISA
14
Internal Revenue Service. Rollovers of Retirement Plan and IRA Distributions
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Internal Revenue Service. Retirement Plans FAQs Relating to Waivers of the 60-Day Rollover Requirement