Quick answer: Usually, if the plan permits an eligible distribution. A direct rollover from a traditional pre-tax 401(k) to a Roth IRA is generally taxable in the conversion year, while after-tax basis is not taxed again. Required minimum distributions cannot be rolled over.
This guide explains the federal or state rule in practical filing terms. It uses the latest official material available on August 15, 2026; always use the form and instructions for the tax year you are filing because line numbers, limits and procedures can change.
At a glance
| Question | Practical answer |
|---|---|
| Who this applies to | Former employees and participants eligible for an in-service distribution under their plan |
| What it does not cover | Amounts that are not eligible rollover distributions, including required minimum distributions |
| Where it is handled | Form 1099-R from the plan, Form 5498 from the IRA custodian, and Form 8606 when applicable |
How the rule works
Start with the legal character of the payment, transaction, benefit or form—not the label used in an advertisement or summary. Tax results can differ when ownership, timing, filing status, residency, basis, participation or documentation changes. The controlling return instructions should be reconciled with all information statements before filing.
- Plan terms determine whether money can leave the plan now.
- Pre-tax contributions and earnings converted to Roth are generally ordinary income, not capital gain.
- A direct trustee-to-trustee rollover avoids the mandatory 20% withholding that generally applies when an eligible rollover distribution is paid to the participant.
- After-tax contributions can sometimes be directed to a Roth IRA while pre-tax amounts go to a traditional IRA in a coordinated distribution.
- Separate five-year rules govern qualified Roth IRA distributions and certain early distributions of conversion amounts.
Practical example
Taylor directly rolls $80,000 of pre-tax 401(k) money to a Roth IRA. Taylor receives no cash, but generally includes $80,000 in taxable income for the year. Paying the tax from outside funds preserves more retirement assets and avoids using the conversion itself for withholding.
The example isolates the main rule and is not a tax calculation for every fact pattern. Other income, deductions, state conformity, related-party rules and prior-year carryovers can change the final result.
Step-by-step checklist
- Ask the plan administrator whether a distribution is currently permitted.
- Separate pre-tax and after-tax amounts using plan records.
- Model federal and state tax, credits, Medicare premiums and NIIT effects.
- Use direct-rollover instructions and verify the receiving account is a Roth IRA.
- Review both Forms 1099-R and 5498 and retain confirmation statements.
Keep copies of the filed return, schedules, source documents, calculations and submission confirmation. If an issuer or agency document is wrong, request a correction instead of silently changing a number without an explanatory record.
Common mistakes to avoid
- Believing a direct rollover makes a pre-tax-to-Roth conversion nontaxable.
- Attempting to roll over the year's RMD.
- Withholding tax from the distribution without replacing it, which can create an unrolled taxable amount.
A tax software interview can help transfer information, but it cannot verify an uncertain legal classification or recreate missing evidence. Pause and obtain advice from a credentialed tax professional or the responsible agency when the dollars are material or the facts are unusual.
Related NavajoTax guides
For connected planning and reporting issues, see IRA distributions and NIIT, future-proof savings plan. Read related pages as a topic cluster, but follow the year-specific official form for the return you actually file.
Frequently asked questions
Is there an income limit on Roth conversions?
Federal law does not impose the Roth IRA contribution income limit on conversions, but plan distribution rules still apply.
Can the conversion be undone?
Roth IRA conversions generally cannot be recharacterized back to traditional status.
Does a direct conversion generate Form 1099-R?
Yes. Direct movement changes withholding mechanics, not the reporting requirement.
Sources reviewed
- IRS 401(k) distribution rules
- IRS rollovers of after-tax contributions
- IRS Instructions for Forms 1099-R and 5498
Last reviewed: August 15, 2026. This article provides general educational information, not individualized tax, legal, investment or benefits advice.