State Taxes and Roth Conversions: Which States Make the Math Work

Federal tax gets most of the attention in Roth conversion planning — but state income tax can add 5–13% to every dollar you convert. For someone converting $1 million over 10 years, that's $50,000–$130,000 in state taxes that a federal-only analysis ignores entirely. This guide breaks down where you stand depending on your state of residence, and what options you have if the numbers don't work where you live.

Why state taxes matter more than most people expect

A Roth conversion is an IRA distribution — you pull money from a traditional IRA and pay income tax on it. Most states treat IRA distributions as ordinary income, taxed at the same rate as wages. If your state has a 9% income tax rate and you convert $100,000, you owe $9,000 to the state on top of your federal bill.

For someone in the 22% federal bracket, the combined federal + state cost on a $100K conversion looks like this:

Federal tax estimated at 22% flat for illustration. Actual state tax depends on total income and filing status. Sources: Tax Foundation 2026 state rate data;¹ see footnotes for state-specific sources.

Over a 10-year plan converting $100K/year, a California resident converts the same $1M as a Florida resident — but pays approximately $93,000 more in state tax. That's money that never makes it into the Roth account and never compounds tax-free.

The three tiers: how states treat IRA distributions

Tier 1 — No state income tax (9 states)

Nine states impose no broad-based personal income tax whatsoever. Roth conversions in these states are taxed only at the federal level:

For the 55–72 age bracket with large traditional IRA balances, these states offer the cleanest conversion math. A $200,000 conversion costs $200,000 × your marginal federal rate — nothing more. No state tax cliff to navigate, no IRMAA interaction compounded by state dollars, no phase-outs to manage.

Florida is the most popular destination for this reason. It has no income tax, no estate tax (for state purposes), and a homestead exemption that can help with property taxes. The combination makes it a meaningful financial planning variable for high-IRA retirees, not just a lifestyle choice.

Tier 2 — Full retirement income exemption (4 states)

Four states impose income tax generally but exempt IRA distributions and retirement income — which means Roth conversions are also exempt. These states function like no-tax states for conversion purposes:

Sources: Illinois DOR;³ Iowa DOR;⁴ Mississippi DOR;⁵ Pennsylvania DOR.⁶

Iowa is worth highlighting specifically: the state's 2026 tax reform explicitly removed state income taxes on Roth conversions for taxpayers age 55 or older. A 58-year-old Iowa resident converting $150,000 from a traditional IRA pays zero Iowa state tax on the conversion — the federal bill is the only one that matters.⁴

Illinois is generous with no age requirement: even a 56-year-old doing a large early-retirement conversion pays nothing to Illinois on the IRA distribution. Pennsylvania requires the account holder to be at least 59½, which means the target 55–72 audience mostly qualifies, but those ages 55–59 planning early conversions should verify their PA eligibility first.

Tier 3 — Partial exemptions and complex rules

New York allows a $20,000 exclusion on pension and annuity income — and the New York Department of Taxation and Finance has confirmed this exclusion applies to Roth conversion income for taxpayers age 59½ or older.⁷ This means the first $20,000 of a Roth conversion is state-tax-free; amounts above that face NY's standard income tax rate (6.85% for most retirees in middle-income ranges, up to 10.9% at higher incomes).

For a New York resident converting $100,000: $20,000 is excluded, leaving $80,000 taxable at state rates. At 6.85%, that's approximately $5,480 in state tax — real money, but partial mitigation compared to a state with no exclusion at all. Married filers each get the $20,000 exclusion, so a couple can shield $40,000 of combined conversion income from state tax per year.

New Jersey has a retirement income exclusion that phases out at higher income levels. At gross incomes below roughly $100,000, NJ exempts pension and IRA income for qualified retirees. Above that threshold, the exclusion phases out and NJ's rates (which reach 10.75% at very high incomes) apply to the full amount. For a pre-retiree doing a large Roth conversion who already has $100K+ of other income, NJ offers little protection.

Tier 4 — Full state income tax on conversions

Most states fall here: California, Oregon, Minnesota, Wisconsin, Hawaii, Vermont, Connecticut, Massachusetts (5%), Maryland, Virginia, North Carolina, Georgia, and others tax IRA distributions as ordinary income at their standard rates with no retirement-income carve-out.

A California resident doing a 10-year plan to convert $1.2M from a traditional IRA — converting $120,000/year — would owe approximately $111,600 in California state taxes over that decade (at 9.3%), on top of their federal bill. The same person as a Florida resident owes zero in state taxes. After accounting for the time value of money and the additional Roth compounding that $111,600 could generate, the difference is material.

The geographic arbitrage strategy — and its risks

Pre-retirees in high-tax states frequently ask: should I establish residency in a low-tax state before doing large conversions?

The short answer is yes — but only if the move is genuine and the timing is right.

What "establishing domicile" requires. States — especially California — are aggressive about residents who move shortly before a large tax event. Simply spending 183 days elsewhere isn't sufficient. Domicile requires a change of primary home, driver's license, voter registration, bank accounts, professional relationships, and demonstrable intent to make the new state your permanent home. California's Franchise Tax Board has challenged residents who moved and immediately executed large Roth conversions, arguing the move was tax-motivated and domicile wasn't truly established. Courts have generally sided with the FTB when the move was recent and the tax event was the primary motivation.

The tradeoff is timing: if your golden conversion window is ages 62–72 and you're considering moving anyway, it may be worth front-loading the relocation to capture 5–10 years of lower state tax on conversions. If you plan to stay in a high-tax state permanently, the state tax cost is simply part of your conversion math — and conversions still often make sense on a federal-only NPV basis, especially if you expect future RMDs to push you into higher federal brackets.

When state taxes don't flip the math

Even at 9–13% state tax rates, Roth conversions frequently remain the right call. The federal bracket differential — 22% now vs 32–37% at RMD age — often dominates the calculation.

Consider a California resident, age 65, with $1.8M traditional IRA, $30,000/year in Social Security, and no pension. Current taxable income before conversions: approximately $18,000. At RMD age (73), with 8 years of 7% growth, the IRA could be $3.1M, generating $113,000+/year in RMDs. The combined federal + state tax on those RMDs at 32% federal + 9.3% CA = 41.3% effective rate on each dollar forced out. Converting at 22% + 9.3% = 31.3% today is still better, even accounting for the state tax drag on the conversion side.

State taxes shift the break-even point but rarely reverse it for someone with a large traditional IRA and a long runway. The question is whether the savings justify the upfront state tax cost — and a multi-year NPV model, accounting for your specific state, is the only way to know for sure.

What a state-aware conversion plan looks like

A plan that properly accounts for state taxes does five things a federal-only plan doesn't:

1. Identifies your state tier — Tier 1/2 (no state tax), Tier 3 (partial exemption), or Tier 4 (full rate). This sets the combined marginal rate used in NPV calculations.
2. Applies state rates to the conversion ladder. If you're converting to the top of the 22% federal bracket, the marginal dollar of conversion costs 22% federal + 9.3% CA = 31.3% combined. That changes how far to fill the bracket before stopping.
3. Stress-tests a potential state relocation. If you're considering moving to Florida or Texas in the next few years, the plan models two scenarios: convert now (at high state rate) vs wait to convert post-move (at zero state rate), accounting for the time cost of delaying.
4. Handles part-year returns correctly. In the year of a state move, conversions are prorated — the state taxes only the income earned during the period of residency. The plan identifies when to execute conversions relative to the move date.
5. Captures state-specific exclusions. For NY residents, the $20,000 per-filer exclusion means a couple should be converting at least $40,000/year to use it fully. Iowa residents turning 55 in the middle of a conversion window get a mid-plan cost reduction.