Moving States in Retirement — Time Your Roth Conversions Around It

The overlooked half of a conversion's cost

Everyone remembers that a Roth conversion is taxed by the IRS. Far fewer remember that your state taxes it too — as ordinary income, at your state's rate. In a state like California, the top marginal rate reaches into the double digits; in Nevada, Texas, Florida, Washington, and five other states, the rate on retirement income is zero.

So if you're planning the classic retirement relocation — say California to Nevada at 65 — the state tax on a conversion done in year 3 versus year 6 isn't a rounding error. It can be the single largest lever in your whole conversion plan.

The core trade-off: convert early, or wait for the move?

There are two competing pressures, and they point in opposite directions:

• Wait for the move to avoid state tax. Every dollar you convert after establishing residency in a no-tax state escapes state income tax entirely. If you're leaving a 9–13% state, that's 9–13% saved on every converted dollar.
• Convert early to use your low-income window. The years right after retirement — before Social Security and RMDs — are when your federal brackets are widest open. Wait too long and RMDs at 73 can force you into higher federal brackets, eroding the federal savings.

The right answer depends on how far apart the move and the RMD deadline are, how big the state-rate gap is, and how large your Traditional balance is. When the move happens well before 73, the usual winner is: convert modestly (or not at all) while you're still a resident of the high-tax state, then convert aggressively in the no-tax state during whatever low-income years remain before RMDs.

A worked example: CA → NV at 65

A couple retires at 62 in California with a $1.2M Traditional IRA, planning to move to Nevada at 65. Suppose they'd convert about $90,000/year either way. The federal tax is the same in both plans; the difference is entirely state tax.

Plan A — convert $90k/yr at 62, 63, 64 (still in CA):
  3 years × $90k × ~9.3% CA marginal   ≈ $25,000 state tax

Plan B — wait, convert $90k/yr at 65, 66, 67 (now in NV):
  3 years × $90k × 0% NV                 = $0 state tax

Same federal outcome. State-tax difference: ~$25,000.

Push the numbers up — a bigger balance, a longer conversion runway, a higher-tax origin state — and the gap crosses $50,000 easily. This is real money that hinges purely on which side of the state line you convert on.

State retirement-income rules aren't all the same

"No income tax" is the cleanest case, but many states offer partial breaks that change the math:

• No income tax at all: NV, TX, FL, WA, WY, SD, TN, AK — conversions are state-tax-free.
• Full retirement-income exemptions: some states (e.g., IL, MS, PA) largely exempt retirement distributions, which can include conversions.
• Per-person dollar exemptions: states like NY, GA, KY, and others exempt a fixed amount of retirement income per person before taxing the rest.
• States that tax Social Security too: a smaller group taxes part of SS benefits, compounding the cost of raising income via conversions.

The point is that a move changes not just the headline rate but how retirement income and conversions are treated — so the comparison has to be state-specific, not just "high tax vs. no tax."

The community-property wrinkle (a bonus for some movers)

A move can also change what happens to your taxable brokerage account at the first spouse's death. When one spouse dies, the cost basis of jointly held brokerage assets is "stepped up," erasing embedded capital gains:

• In most (common-law) states, only the deceased spouse's half steps up.
• In community-property states — AZ, CA, ID, LA, NV, NM, TX, WA, WI — the entire jointly held account steps up, wiping out all embedded gain.

Notice that several no-income-tax destinations (NV, TX, WA) are also community-property states — so a CA → NV move keeps the full step-up benefit while dropping the income tax. This interacts with conversion strategy because a full step-up can make holding appreciated brokerage assets more attractive than converting, at the margin.

What to do

1. Model both the origin and destination state explicitly, with the move age you actually plan — not a blended guess.
2. Lean conversions toward the low-tax side of the move when the move lands comfortably before age 73, but don't waste the pre-RMD federal window entirely.
3. Check the RMD collision. If the move is close to 73, you may be forced to take (state-taxable) RMDs in the origin state anyway — which argues for some earlier conversion.
4. Confirm residency cleanly before converting in the new state, and keep records of the move date.

How RothHelper handles it

The RothHelper calculator lets you model a mid-retirement state move: pick an origin state, a destination state, and the age at which you relocate. At the move age, the destination state's income-tax rate, its retirement-income exemption rules, and its community-property step-up treatment all switch automatically — so the projection charges the right state tax on each year's conversion before and after the move.

Because the Advisor tab's lifetime-cost ranking includes state tax, a conversion plan that ignores the move is correctly compared against one that times conversions around it — often a five-figure swing you can see directly in the Projections table.