Why Retirees Moving From New Jersey to Florida Wait Until the Moving Truck Leaves to Convert to a Roth

New Jersey sent 20,113 tax returns covering 34,761 people to Florida in the 2022-2023 IRS migration data. Those households carried $2,957,951,000 in adjusted gross income. If you’re part of that group and have a traditional IRA, the date you convert to a Roth can matter as much as the amount you convert.

Residency on Conversion Day Decides the State Bill

A Roth conversion counts as income. Under 26 U.S.C. § 408A(d)(3)(A)(i), the converted amount goes into gross income to the extent it would have been taxable as a regular distribution. IRS Publication 590-A says these amounts are “normally included in income on your return for the year that you converted them from a traditional IRA to a Roth IRA.”

State income tax on a conversion generally depends on where you are a resident when the conversion happens. If you convert while you’re still a New Jersey resident, New Jersey generally gets to tax that income. If you convert after you’ve made Florida your legal residence, the result is different. Florida’s Income Tax Code defines a “taxpayer” as “any corporation subject to the tax imposed by this code” (Fla. Stat. § 220.03(1)(z)). The Florida Department of Revenue describes chapter 220 as the Florida corporate income tax.

The federal tax remains the same wherever you live. The same brackets apply in Newark and in Naples.

A Hypothetical Couple Shows the Math

Example household: A married couple filing jointly, both retired, plans to convert $100,000 in 2026. Their other income is $110,000.

1. Income including the conversion: $110,000 plus $100,000 equals $210,000.
2. Next, subtract the 2026 standard deduction of $32,200 for joint filers. To keep the example simple, this ignores age-based deductions. $210,000 minus $32,200 equals $177,800 of taxable income.
3. In 2026, the 22% rate applies to joint taxable income over $100,800, and 24% begins above $211,400. That puts the top of this conversion in the 22% bracket.
4. Their $210,000 of income also remains below the $218,000 joint threshold where the 2026 Medicare Part B surcharge (IRMAA) starts.

Every one of those steps comes out the same whether the couple lives in New Jersey or Florida. The only difference is the state tax. A conversion done as a New Jersey resident adds whatever New Jersey charges on $100,000, so check New Jersey’s own guidance or a tax professional for that figure. After the couple becomes Florida domiciliaries, the same conversion owes no individual income tax to Florida.

Part-Year Residency Splits the Moving Year

In the year you move, you usually file as a part-year resident in each state. Income is generally assigned to the state where you lived when you received it. A conversion in March, before the move, falls on the New Jersey side of that split. The same conversion in November, after the move is complete, generally does not. For that reason, many movers set the conversion for after the truck is gone and the paperwork is filed.

Legal residence Takes Paperwork and Proof

Renting a condo in Florida isn’t enough to change your legal residence. States look for evidence that you’ve cut ties and settled somewhere new:

• Driver’s license and car registration: switch them to Florida right away.
• Voter registration: register in your new county and cancel your New Jersey registration.
• Homestead: Florida grants the homestead exemption to a person who, on January 1, holds title to the property and “in good faith makes the property his or her permanent residence” (Fla. Stat. § 196.031(1)(a)).
• Time: keep records of where you actually spend your days, plus where your doctors, bank accounts and memberships are.

New Jersey Can Still Challenge the Move

A former state can argue that you never really left. That argument gets stronger if you keep a New Jersey house, spend long periods there, or report a large conversion soon after the move. Selling or renting out the old home and moving your daily life south make the Florida claim stronger. Keep that evidence until the period for reviewing your returns has passed.

Federal Rules Still Apply After the Move

• Take your RMD first: you can’t convert amounts that must be distributed for the year, including the calendar year in which you reach age 73.
• No do-overs: under 26 U.S.C. § 408A(d)(6)(B)(iii), a conversion can’t be recharacterized, so a conversion you regret can’t be reversed.
• How to move the money: you can convert with a 60-day rollover, a trustee-to-trustee transfer, or a transfer within the same trustee (26 CFR 1.408A-4(b)).
• Reporting: conversions are reported on Form 8606, and you may need to raise your withholding or make estimated tax payments.

Who Should Skip the Strategy

Waiting tends to fit people with a firm move date, cash outside the IRA to pay the federal tax, and room left in their current bracket (the quiet stretch between your last paycheck and your first RMD is often the cheapest window you’ll ever get to convert, which is the whole subject of our free Roth conversion guide). It fits poorly in these cases:

• You plan to keep strong New Jersey ties, which could lead to a residency challenge.
• You’ll need the IRA money soon.
• A large conversion would push joint income past $218,000. In 2026, that raises the monthly Part B premium from $202.90 to $284.10, and a Part D surcharge of $14.50 is added.
• You expect your heirs to be in lower brackets than you, which makes leaving pre-tax money to them cheaper.

Medicare’s surcharge figures beyond 2026 are still pending. If you’re planning a conversion for after the move, look for the new levels before you choose an amount.

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