Yes — moving traditional IRA dollars into a Roth IRA is a Roth conversion, allowed for any taxpayer at any income level since 2010. The converted amount is taxable as ordinary income in the conversion year (IRC §408A(d)(3)). No annual cap on conversion size, but conversions are irreversible since the 2017 TCJA, and the pro-rata rule (IRC §408(d)(2)) applies if you have other pre-tax IRA balances.

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Quick Facts

  • check_circleNo income limit on conversions since 2010 (TIPRA). Backdoor Roth path open at any income.
  • infoConversion = taxable ordinary income in the conversion year. Reported on Form 1099-R from the source traditional IRA + Form 8606.
  • infoNo annual conversion cap. You can convert any amount; tax bill scales accordingly.
  • warningPro-rata rule applies if you have any pre-tax balance in any traditional/SEP/SIMPLE IRA. Per IRC §408(d)(2).
  • warningConversions are irreversible after TCJA (2018+). Recharacterization of conversions was eliminated. Recharacterization of contributions still allowed.

Mechanics of a Conversion

The procedure varies slightly by custodian but the core steps are universal:

  1. Decide the conversion amount. Based on tax-bracket-fill strategy (convert up to the top of your current bracket without crossing into a higher one) or other planning logic. See Roth Conversion Tax for the full federal+state+IRMAA stack.
  2. Initiate the conversion. Same-custodian conversions are usually a single online form. Cross-custodian: trustee-to-trustee transfer (preferred) or 60-day indirect rollover.
  3. Choose tax withholding. Custodian default is 10% federal. Most readers should ELECT 0% withholding and pay tax separately from outside funds — see How to Pay Taxes on a Roth Conversion for why.
  4. Receive Form 1099-R from the source traditional IRA reporting the gross conversion amount. Code 7 (over 59½) or 2 (under 59½, exception applies) or G (direct trustee-to-trustee).
  5. File Form 8606 with your tax return for the conversion year. Reports the conversion, calculates basis allocation per the pro-rata rule, and computes taxable vs. basis-recovery portions.
  6. Pay the tax via either quarterly estimated tax (Form 1040-ES) or increased W-2 withholding to avoid the §6654 underpayment penalty.

The Pro-Rata Rule You Need to Know About

If you have ANY pre-tax dollars across your traditional, SEP, or SIMPLE IRAs (combined, not per-account), the IRS treats them as one pool for the conversion basis calculation. Under IRC §408(d)(2), basis is allocated proportionally — you can't cherry-pick the after-tax dollars to convert tax-free.

Worked example: $92,500 pre-tax in a rollover IRA + $7,500 nondeductible (basis) in a separate traditional IRA = $100,000 total, of which 7.5% is basis. Convert $7,500 from the basis-only account to a Roth IRA: only 7.5% × $7,500 = $562.50 is tax-free. The other $6,937.50 is taxable. Most readers expecting their nondeductible basis to convert tax-free are unpleasantly surprised.

To avoid this: roll all pre-tax IRA dollars into a 401(k) before converting (the 401(k) is excluded from §408(d)(2) calculation), convert the entire pre-tax balance and pay the tax now, or wait until you have no pre-tax IRA balance. See How to Avoid the Pro-Rata Rule for the full procedure.

Why People Do This

Five common reasons for converting traditional IRA dollars to Roth:

  • Tax-rate hedge. Pay tax now at known rates; never pay tax again in retirement when rates may be higher.
  • RMD elimination. Roth IRAs have no lifetime RMDs; traditional IRAs require RMDs at age 73+ (75 for those born 1960+). Converting removes the future RMD burden.
  • Tax diversification. Mix of pre-tax and after-tax buckets in retirement gives year-by-year tax-management flexibility.
  • Estate planning. Roth IRAs pass to heirs generally tax-free; traditional IRAs are taxable to inheritors. Converting now (paying your tax) removes the tax burden from heirs.
  • Backdoor Roth (high earners). Direct Roth IRA contributions are blocked above the MAGI limit, but conversions have no income limit. Nondeductible traditional IRA contribution + immediate conversion = de facto Roth contribution at any income.

When NOT to Convert

  • Currently in a high tax bracket, expecting much lower retirement bracket. Pay 35% now to skip 12% later — bad math.
  • Need the converted dollars to pay the tax. Using the conversion principal to pay tax destroys most of the conversion's economic benefit; pay from outside funds.
  • Pro-rata rule applies and you can't avoid it. If you have $500K of pre-tax IRA dollars and want to convert $7K of basis, the math may not justify the cost.
  • Conversion would push you across an IRMAA cliff or trigger SS taxation. The hidden tax cost can exceed the marginal-bracket cost by 5-10% effective rate. Run the True Cost of a Conversion tool with your numbers before committing.