Selling the House Up North to Move to Florida Will Trigger a Tax Torpedo Nobody Warns Retirees About

Plenty of people in their 60s land on the same plan: sell the house up north that has climbed in value, buy something smaller in Florida, and let a state with no income tax stretch the nest egg. The reasoning holds up too, since Florida ranks first for individual income tax in the 2025 State Competitiveness Index.

The trouble is concentrated in a single tax year, the one in which the house sells, and it keeps costing you for two more years after that. Here’s what it takes to make the move without handing back a big chunk of the windfall.

A Home Sale Exclusion That Never Kept Up With Prices

Married homeowners who have owned and lived in the home for two of the last five years can exclude up to $500,000 of gain, or $250,000 for a single filer. That well-known cap dates back to 1997 and has never been adjusted for inflation. Over the same stretch, home prices kept climbing, with the Case-Shiller national index at 337.3, roughly 23% above its October 2021 reading. If you bought in the suburbs of New York or Boston decades ago, your gain may well be larger than the exclusion.

Your old state gets paid first. Real estate gains are taxed where the property sits. Becoming a Florida resident before closing does not get you out of that bill. New York, for example, requires a nonresident taxpayer to estimate and pay the personal income tax on the gain at the time of sale.

How One Big Year Triggers Three Federal Charges

Take a couple, both 66, collecting the SSA’s average aged-couple benefit of $3,208 a month, or $38,496 a year. They pull $42,720 from an IRA to cover living costs and have a taxable gain of $500,000 left after the exclusion. Their modified AGI comes to about $575,442.

• Capital gains tax: up to $75,000 at 15%.
• Net investment income tax: 3.8% applies to income above $250,000 for joint filers. That threshold is fixed in the law and not indexed, which here means about $12,367.
• Medicare IRMAA, two years later: surcharges start once joint income passes $218,000. The standard Part B premium is $202.90, and higher premiums run from $284.10 to $689.90 per person. For the couple, that adds $1,949 to $11,688 for the year, before any Part D surcharge.

The IRMAA hit is the one people don’t see coming, as it shows up long after the closing. The SSA’s appeal process for a life-changing event covers things like retirement or a spouse’s death. Selling a house doesn’t qualify.

It quietly drains retirement accounts. This is one of several IRS rules, and we mapped out the rest in a free report on the retiree’s tax traps. Sellers with smaller pensions face one more charge. Once provisional income passes $44,000 on a joint return, up to 85% of Social Security benefits become taxable.

The federal tax alone comes to roughly $87,367. If you take out 4% a year, that is about $3,500 in annual retirement income you will never collect.

What the Florida Budget Actually Requires

The average U.S. household spent $78,535. Adjust that for Florida’s cost-of-living index of 103.414, above the national average, and you get about $81,200. Subtract Social Security, and the couple has a gap of about $42,700. At 4%, covering that takes about $1.07 million. At 3.5%, which leaves room for a 30-year retirement and Florida’s homeowners insurance costs, it takes about $1.22 million. Only the sale proceeds left after tax count toward that number.

Inflation also matters here: CPI rose about 3.4% over the past year, so the portfolio has to earn at least that much on top of the withdrawal rate. With the 10-year Treasury yielding 5.24%, a Treasury ladder can hold the cash needed for the tax bill and the IRMAA years. That interest also counts toward taxable income.

Widowhood Shrinks Every Threshold at Once

A surviving spouse keeps the full $500,000 exclusion only if the house sells within 2 years of the date of death. After that window closes, the exclusion falls to $250,000. The net investment income tax threshold drops to $200,000, and IRMAA starts at $109,000. The same house comes with a much bigger tax bill.

Making the move work takes roughly $1.1 million to $1.2 million invested after all taxes, withdrawals of 3.5% to 4% a year, and returns that stay ahead of inflation, running near 3.4%. Receipts for improvements help protect that number, since each one raises the cost basis. Other strategies can reduce the burden. They include closing the sale in a year with little other income, moving Roth conversions to a different year, and setting aside IRMAA money for two years out. For a surviving spouse, a sale within two years keeps the larger exclusion. The move to Florida can still pay off, with more of the benefit going to people who plan the sale year as carefully as the move.

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