State Taxes on Roth Conversions: A State-by-State Guide

Key Takeaways

• Most states tax Roth conversions like ordinary income; nine states have no income tax at all.
• A handful of states exempt retirement income entirely — moving can change the conversion math.
• State tax can add 4-13% to a conversion's cost, so it belongs in every calculation.

How States Treat Conversions

Every state that taxes income generally taxes a Roth conversion in the year it happens — the converted amount is added to your state taxable income and taxed at your state rate. The practical range is significant: a conversion costing 24% federally costs roughly 28-33% all-in in California or Oregon (top rates near 13% with local taxes), but just 24% in the nine states with no income tax (Texas, Florida, Nevada, Washington, Alaska, South Dakota, Tennessee, Wyoming, New Hampshire — note New Hampshire taxes interest and dividends only, not wages). A few states — Pennsylvania, Illinois, Mississippi — exempt retirement income, meaning a conversion done after retiring there can escape state tax entirely even though federal tax still applies.

The Moving Strategy

State tax creates a legitimate planning lever: convert before moving to a high-tax state, or after moving to a low-tax one. Because the conversion is taxed in the state where you are a resident in the year of the conversion, timing a conversion around a relocation can save tens of thousands of dollars on a large balance. Two cautions: first, part-year residency means both states may tax a slice — plan the conversion for the year you are fully domiciled in the cheaper state; second, some states have clawback rules or "source" income rules that complicate the picture. This is squarely in "consult a tax professional" territory for large conversions.

What to Watch For

• State deductions: some states allow a deduction for IRA contributions, which reduces the cost of building Traditional money in the first place.
• Local taxes: a few cities (Philadelphia, for example) tax income on top of the state — a conversion while living there costs extra.
• State conformity: most states conform to federal treatment of conversions; a handful have quirks — check your state's rules before assuming.
• Roth IRA withdrawals: all states exempt qualified Roth distributions from tax, so the tax-free endpoint is universal.

Action Steps

1. Add your state's top marginal rate to the conversion tax math before converting.
2. If you plan to relocate, time large conversions for the low-tax year.
3. Check whether your state taxes retirement income at all — it changes the Roth-versus-Traditional answer for retirees.
4. Keep records of residency dates if you convert around a move.

A Planning Checklist for Multi-State Situations

• Know your state's rate and rules: most states conform to federal treatment (conversion = income in the conversion year); a few have retirement-income exemptions that can shield conversions made after retirement.
• Time conversions around moves: a conversion is taxed by the state where you are domiciled on the conversion date — a large conversion is often best done in a low-tax state year.
• Watch part-year residency: moving mid-year can split the conversion's taxation between two states; in that case, convert in the year you are fully domiciled in the cheaper state.
• Check local taxes: a handful of cities (e.g., Philadelphia) tax income on top of state rates.
• Document domicile: driver's license, voter registration, and primary residence records establish which state's rules apply — keep them consistent.
• Remember the endpoint: qualified Roth distributions are tax-free in every state — the tax question is only about the conversion year, not the withdrawals.

State Tax Planning for Conversions

State treatment of Roth conversions falls into three buckets. No state income tax (Texas, Florida, Nevada, Washington, Wyoming, South Dakota, Alaska, Tennessee, New Hampshire): conversions are state-tax-free — a strong argument for converting while living there. Conform to federal rules (most states): the conversion is taxable state income in the year you do it. Special treatment: Pennsylvania exempts conversions from state tax entirely, and New Jersey only taxes the portion attributable to contributions that were deductible. If you are planning to move, the timing matters — converting while a resident of a no-tax or PA-style state saves 3-10% of the conversion amount. Retirees should also check whether their state taxes retirement income differently (many exempt pension and IRA withdrawals). As always, the federal tax dominates the decision — state tax is typically 4-10% on top — but on a $100,000 conversion, that is $4,000-10,000 of real money.