Roth IRA Conversion Tax by State 2026: State Tax on Conversions & Timing Strategy

The Roth IRA conversion is one of the most powerful retirement tax planning tools — converting pre-tax savings to after-tax Roth funds that grow and withdraw tax-free forever. But the state income tax dimension of Roth conversions is often overlooked. The difference between completing a conversion as a California resident vs. a Florida resident can be $13,300 per $100,000 converted — a significant optimization opportunity for those planning a state change.

Roth IRA Conversion: Federal Tax Mechanics

A Roth conversion is straightforward federally:

What Is Taxed

The converted amount (minus any non-deductible basis tracked on Form 8606) is added to your ordinary income in the year of conversion. If you convert $100,000 from a Traditional IRA to a Roth IRA, you add $100,000 to that year's taxable income. At a 24% federal bracket, that is $24,000 in federal income tax. State income tax is additional.

AGI Effects

Roth conversions increase your Adjusted Gross Income (AGI), which affects: ACA marketplace subsidies (conversions above certain income levels phase out the Premium Tax Credit), Medicare IRMAA surcharges on Part B and Part D premiums (high-income retirees pay more), the Net Investment Income Tax (3.8% on investment income if MAGI exceeds $200K single), and phase-outs of other deductions/credits. Plan conversions carefully around these thresholds.

Optimal Conversion Strategy

The best years to convert are: low-income years (retirement gap before Social Security/RMDs begin), years you are in a lower bracket than expected in future years, and years when you live in a low-tax or no-tax state. The worst year to convert: a high-income year in a high-tax state when you are near the top federal bracket and maximum state rate.

State Tax on Roth Conversions: State-by-State Guide

State tax treatment of Roth IRA conversions follows the state's treatment of IRA/retirement income:

States With No Tax on Roth Conversions

• Florida: No state income tax — $0 state tax on any Roth conversion amount
• Texas: No state income tax — $0 state tax
• Nevada: No state income tax
• Wyoming: No state income tax
• South Dakota: No state income tax
• Washington State: No income tax on Traditional IRA distributions — Roth conversions are not subject to WA capital gains tax (which only applies to investment securities sales, not IRA distributions)
• Tennessee: No income tax on wages or retirement income
• New Hampshire: No income tax on wages (dividends/interest tax eliminated 2025)

States With Full State Tax on Conversions

States With Partial or No Tax on IRA Distributions

These states exempt IRA distributions or conversions from state income tax:

• Pennsylvania: IRA distributions after qualifying age are fully exempt — Roth conversions may also be partially or fully exempt; consult a PA CPA for specifics
• Illinois: Retirement income (including IRA distributions) is exempt from Illinois income tax — Roth conversions in Illinois may be exempt
• Mississippi: All retirement income is exempt — Roth conversions may be exempt

The Move-Then-Convert Strategy

The most powerful Roth conversion strategy for high-tax-state residents with large pre-tax IRAs: (1) Retire or semi-retire at a point when ordinary income drops; (2) Change domicile to Florida, Texas, or Nevada; (3) Complete Roth conversions in the no-tax state. The state tax saving on a $500,000 conversion: California saves $50,000–$66,500; New York saves $40,000–$54,500. This is a strategy that requires careful execution of genuine domicile change (see state residency guides for California and New York).