A 403b to Roth IRA conversion is a taxable move of pre-tax 403(b) money into a Roth IRA, counted as ordinary income in the year you convert. A direct rollover keeps the cash from touching your hands, and each conversion starts its own 5-year clock.
Key Takeaways
- Moving pre-tax 403(b) dollars to a Roth IRA is a conversion, so the converted amount is added to your ordinary income for the year, per IRS Publication 590-B.
- Use a direct (trustee to trustee) rollover. A 403(b) distribution paid to you instead is subject to 20% mandatory federal withholding.
- Each Roth conversion carries its own 5-year rule. Withdrawing converted principal within 5 years and before age 59½ can trigger a 10% additional tax (IRS Pub 590-B).
- The top of the 2026 24% federal bracket is $201,775 (single) and $403,550 (married filing jointly), per the IRS 2026 inflation adjustments.
- A large conversion can raise modified adjusted gross income and lift Medicare IRMAA two years later, which for 2026 begins above $109,000 (single) and $218,000 (joint) on 2024 income (Medicare.gov).
- A 403(b) to Roth IRA move differs from a 403(b) versus 401(k) comparison and from a pre-tax 403(b) to 401(k) rollover: only the conversion to Roth is a taxable event.
403(b) to Roth Conversion
Figures for the 2026 tax year, verified against IRS primary sources.
What is a 403b to Roth IRA conversion?
A 403b to Roth IRA conversion is the act of moving money out of a 403(b) tax-sheltered annuity and into a Roth IRA, which converts pre-tax dollars into after-tax Roth dollars. A 403(b) covers employees of public schools, many nonprofits, and certain ministers, and most balances are pre-tax, according to IRS Publication 571.
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Because those dollars were never taxed, the government collects income tax at the point of conversion. This is the same mechanic behind any Roth conversion: you pay ordinary income tax now so future qualified growth and withdrawals can come out tax free.
If part of your plan is a designated Roth 403(b), that portion moves into a Roth IRA without a new tax bill, since it was already taxed. Only the pre-tax portion is the taxable conversion.
How does the direct rollover from a 403(b) to a Roth IRA work?
The cleanest path is a direct rollover, in which the 403(b) custodian sends the money straight to the Roth IRA custodian. The IRS notes that no tax is withheld on a true direct rollover, while a distribution paid to you is hit with 20% mandatory withholding even if you plan to roll it over later.
You generally need a distributable event first: leaving the employer, reaching age 59½, or another trigger your plan allows (IRS Pub 571). Many retirees run the conversion after separating from service, when the full balance becomes portable.
| Step | What happens | Why it matters |
|---|---|---|
| 1. Confirm eligibility | Verify a distributable event (separation, age 59½, or plan rule) | An in-service 403(b) may not be movable yet (IRS Pub 571) |
| 2. Open the Roth IRA | Establish the receiving Roth account | The conversion needs a Roth destination |
| 3. Elect a direct rollover | Have the 403(b) custodian pay the Roth IRA custodian | Avoids the 20% mandatory withholding |
| 4. Report the income | The pre-tax amount is added to ordinary income | Drives your tax bracket for the year |
| 5. Pay the tax | Use non-retirement cash for the tax bill | Preserves the full amount inside the Roth |
| 6. Track the clock | Note the conversion date and the 5-year period | Governs penalty-free access to converted principal |
How is a 403b to Roth IRA conversion taxed?
The pre-tax amount you convert is added to your taxable income for the conversion year and taxed at ordinary income rates. There is no separate conversion tax and no cap on how much you may convert, so the size of the conversion is what pushes you up through the brackets. You can estimate the bill using your expected marginal rate.
Where the money to pay that tax comes from matters. Paying the tax from outside cash keeps the whole converted balance growing in the Roth. Paying it from the converted funds shrinks the Roth and, if you are under 59½, the withheld amount can itself be treated as an early distribution. Q3 covers the funding question in depth in how to pay Roth IRA conversion taxes.
What is the 5-year rule for Roth conversions?
Each Roth conversion starts its own separate 5-year period, and this rule is different from the 5-year clock on Roth contributions. Under IRS Publication 590-B, if you withdraw converted principal within 5 years and before age 59½, a 10% additional tax can apply to that amount even though you already paid income tax on it.
Once you are past age 59½, the conversion 5-year rule generally stops being a penalty concern for the converted principal. Retirees still track each conversion year so they know when every layer is fully seasoned. Q3 walks through the mechanics in the 5-year rule for Roth conversions.
When does a 403b to Roth IRA conversion make sense?
A conversion tends to fit when your current marginal rate is lower than the rate you expect to pay later. Many retirees find that window after leaving the employer but before Social Security and required minimum distributions begin, when income can dip into a lower bracket. Timing the conversion within the year also affects how precisely you can fill a bracket.
Required minimum distributions now begin at age 73 for those born 1951 to 1959 and age 75 for those born 1960 or later under SECURE 2.0. Converting in the lower-income years before RMDs start can reduce the future pre-tax balance that would otherwise be forced out and taxed. Whether a series of partial conversions fits is something a multi-year plan can model.
| Situation | Signal | Typical read |
|---|---|---|
| Low-income gap year | Taxable income sits well below the top of your target bracket | Often a fit: room to convert at a known rate |
| Already left the employer | The full 403(b) balance is portable | Often a fit: cleanest direct rollover |
| Cash on hand for the tax | You can pay from a taxable account | Often a fit: the Roth stays whole |
| Peak earning year | Income already near a bracket ceiling | Often wait: conversion may spill into a higher rate |
| Two years before Medicare | Converting could lift MAGI over an IRMAA tier | Often wait or size down: watch the 2-year lookback |
| No outside cash for tax | Only plan money is available to pay | Often wait: paying from the conversion erodes it |
What are the pitfalls of converting a 403(b)?
The most common pitfall is bracket creep. A conversion stacks on top of your other income, so a large amount can push part of the conversion from the 24% bracket into higher rates. Sizing the conversion to stop near the top of a target bracket keeps the marginal cost predictable.
The second is IRMAA. Because Medicare uses modified adjusted gross income from two years earlier, a conversion at 63 can raise premiums at 65. For 2026, the first IRMAA tier begins above $109,000 (single) and $218,000 (joint) on 2024 income, per Medicare.gov. Q3 covers this timing trap in Roth conversions before age 63 and IRMAA.
The third is having no outside cash to pay the tax. Using the converted dollars to cover the bill shrinks the Roth and can add an early-distribution penalty under 59½. A conversion also raises MAGI that year, which can affect other thresholds.
How is a 403b to Roth IRA conversion different from a 403(b) to 401(k) rollover?
A 403(b) to Roth IRA move is a taxable conversion, while a pre-tax 403(b) rolled into a pre-tax 401(k) is a like-to-like transfer with no tax due. The Roth conversion changes the tax character of the money, which is why the pre-tax amount lands on your return as income (IRS Pub 590-B). Keeping pre-tax with pre-tax simply relocates the account.
It is also a different question from the plan-versus-plan comparison in 403(b) versus 401(k), which weighs features and rules rather than a tax event. In short: same starting account, very different tax outcomes, so the label on the destination account is what drives the bill.
Frequently asked questions
Is a 403b to Roth IRA conversion taxable?
Yes. The pre-tax amount you convert is added to your ordinary income for the conversion year and taxed at your marginal rate, per IRS Publication 590-B. Any designated Roth 403(b) portion moves without new tax.
Can I roll a 403(b) directly into a Roth IRA?
Yes. The IRS rollover rules permit moving a 403(b) into a Roth IRA. Use a direct, custodian-to-custodian rollover so no 20% federal withholding is taken from the amount.
Do I have to convert my whole 403(b) at once?
No. There is no cap on conversions and no all-or-nothing rule, so partial conversions across several years are common. Many retirees size each conversion to a target tax bracket.
How does the 5-year rule apply to a converted 403(b)?
Each conversion starts its own 5-year clock. Withdrawing converted principal within 5 years and before age 59½ can trigger a 10% additional tax, even though income tax was already paid at conversion.
Will a 403(b) conversion raise my Medicare premiums?
It can. The converted amount lifts modified adjusted gross income, and Medicare looks back two years. For 2026, IRMAA surcharges begin above $109,000 for single filers and $218,000 for joint filers on 2024 income.
Can I convert a 403(b) while still working?
Sometimes. Conversion generally needs a distributable event, such as reaching age 59½ or separating from the employer. In-service rollovers depend on your plan terms, as outlined in IRS Publication 571.
Should I pay the conversion tax from the 403(b) itself?
Paying the tax from outside cash keeps the full amount inside the Roth. Using plan money to cover the tax reduces the Roth balance and, before age 59½, the withheld portion can be treated as an early distribution.
Modeling a conversion year
A 403(b) to Roth IRA conversion is one move inside a broader retirement tax plan. A financial professional can model how a conversion interacts with your brackets, IRMAA, and RMD timeline. Explore Q3 Advisors’ Roth conversion library to see how the pieces fit.
This article is for educational purposes only and is not individualized investment, tax, or legal advice. Consult a qualified professional about your specific situation.
