The 2026 SALT Cap and Mortgage Interest Deduction: What the New Tax Rules Mean for a Tampa Bay Luxury Home Purchase

How do the 2026 SALT cap and mortgage-interest rules affect buying a luxury home in Tampa Bay?

For 2026, the federal SALT deduction cap rises to $40,400 for most filers — quadruple the old $10,000 limit — which means a Tampa Bay property tax bill that used to be mostly nondeductible can now be written off in full by many itemizers. At the same time, the $750,000 cap on mortgage debt eligible for the interest deduction is now permanent, so interest on the portion of a jumbo loan above that threshold stays nondeductible. The higher SALT cap phases down for incomes above roughly $505,000, falling back to $10,000 at just over $600,000 of modified adjusted gross income. Together, the two rules reshape the after-tax cost of owning at the $1M–$5M level — and they reward running the numbers before you buy, not after.

Federal tax law quietly rewrote part of the affordability math for premium homebuyers, and most of the buyers I talk with haven't fully absorbed it yet.

The 2025 tax law — the One Big Beautiful Bill Act — made two changes that matter directly to anyone buying at the $750K+ level in Tampa Bay. It raised the cap on the state and local tax (SALT) deduction from $10,000 to $40,000 starting in 2025, with the cap set at $40,400 for the 2026 tax year. And it made the $750,000 mortgage-debt limit on the interest deduction permanent, ending years of speculation that the old $1 million limit would return.

Neither change tells you which house to buy. Both change what a given house costs you after taxes. Here's how to think it through as a Tampa Bay buyer.

What actually changed

Three provisions do most of the work:

• The SALT cap quadrupled — for now. From 2018 through 2024, you could deduct no more than $10,000 in combined state and local taxes, no matter how large your property tax bill was. For 2026 the cap is $40,400 ($20,200 if married filing separately), and it's scheduled to rise about 1% per year through 2029 before reverting to $10,000 in 2030 unless Congress acts again.
• The higher cap phases down at high incomes. Once modified adjusted gross income passes roughly $505,000 in 2026 ($252,500 married filing separately), the cap shrinks by 30 cents for every additional dollar of income, until it lands back at the $10,000 floor at just over $600,000 of MAGI. High earners never fall below $10,000 — but they don't get the full benefit of the new cap either.
• The $750,000 mortgage-interest limit is permanent. Interest is deductible only on the first $750,000 of acquisition debt for loans originated after December 15, 2017. Older loans remain grandfathered up to $1 million. The law also restored the deduction for mortgage insurance premiums beginning in 2026, though it phases out above roughly $100,000 of income — so it rarely applies at the price points this blog covers.

One more foundational point: none of this matters unless you itemize. The standard deduction for 2026 is $32,200 for joint filers ($16,100 single), so the SALT change is really a change in whether itemizing beats the standard deduction — and for owners of higher-value Florida homes, it now frequently does.

What SALT looks like when you own in Florida

Florida has no state income tax. That's a familiar part of the relocation pitch, but it has a specific consequence for this deduction: for most Florida homeowners, SALT is essentially your property tax bill, plus an optional deduction for state and local sales taxes in place of income taxes.

Under the old $10,000 cap, that structure meant much of a premium Tampa Bay property tax bill was simply lost as a deduction. Inside the City of Tampa, combined millage runs near 20 mills — roughly $2 of tax per $100 of taxable value — so every $500,000 of taxable value generates on the order of $10,000 in annual property tax. Owners of homes taxed at $1M+ of taxable value routinely paid $20,000, $30,000, or more, and could deduct only a third or less of it.

The new cap changes that arithmetic. A property tax bill in the $20,000–$40,000 range — common territory for South Tampa, Davis Islands, Harbour Island, and waterfront Snell Isle properties — can now be fully deductible for an itemizer whose income sits below the phase-down range. For a buyer relocating from a high-tax state, the combination is notable: no state income tax to eat up the cap, and a cap now large enough to absorb a substantial Florida property tax bill.

A few Florida-specific wrinkles belong in the calculation:

• Homestead status drives the bill. A homesteaded Tampa Bay home gets up to roughly $50,000 in exemptions and the Save Our Homes cap, which limits annual growth in assessed value to 3% or the inflation rate, whichever is lower. A second home or investment property gets neither — just the 10% non-homestead assessment cap, which doesn't apply to school levies. Same purchase price, materially different tax bill, materially different deduction.
• The bill resets when you buy. Florida reassesses to full just value as of January 1 after a sale, so the seller's tax bill is not your tax bill. Estimate your own post-reset number before you write an offer, and if the new assessment comes in above market value, you can challenge it — I covered that process in how to contest a Tampa Bay property tax assessment.
• Closing taxes don't count. Florida's documentary stamp tax on the deed ($0.70 per $100 of price) and the intangible tax on a new mortgage are transfer taxes, not deductible SALT. They generally get added to your cost basis instead.

The mortgage-interest side of the ledger

The permanent $750,000 cap lands squarely on Tampa Bay's luxury segment, where most financed purchases involve jumbo debt. Interest on the first $750,000 of acquisition debt is deductible if you itemize; interest on everything above it is not.

That has two practical implications. First, the after-tax cost of jumbo debt is higher than the note rate suggests once your balance passes the cap, which shifts the borrow-versus-pay-cash analysis for buyers with liquidity. Second, loan structure matters: some buyers hold acquisition debt near the cap and cover the balance with other capital, rather than financing the full amount at a partially nondeductible rate. How lenders underwrite at this level — and where the trade-offs sit — is covered in my guide to Tampa Bay jumbo mortgages for luxury buyers.

If you're carrying a pre-2018 mortgage grandfathered at the $1 million limit, note that the grandfathering follows the loan, not you. Selling and financing a new purchase puts the new loan under the $750,000 cap — a real, quantifiable cost of moving that belongs in any move-up or downsize analysis alongside Save Our Homes portability.

The phase-down changes planning at higher incomes

The 30% phase-down creates an odd zone between roughly $505,000 and $606,000 of MAGI in 2026, where each additional dollar of income also strips away 30 cents of SALT deduction. Tax professionals have taken to calling the effect a “SALT torpedo” — inside that band, your effective marginal rate runs meaningfully higher than your bracket suggests.

For buyers whose income moves around — business owners timing distributions, executives with vesting equity, athletes with signing-bonus years — the timing of income relative to the phase-down band can swing the value of the deduction by five figures. That's a conversation for your CPA, and I'd have it before you close, not at filing time. Where the purchase itself has flexibility — closing date, how much to finance, whether the home will be homesteaded — the tax side and the real estate side are worth coordinating.

I'm a broker, not a tax advisor, and nothing here substitutes for advice on your specific return. But I walk buyers through the property tax and financing mechanics on real Tampa Bay properties every week, and the buyers who model the after-tax carry cost before offering consistently make cleaner decisions than the ones who discover it at their first TRIM notice.

Frequently Asked Questions

What is the SALT deduction cap for 2026?

The cap is $40,400 for most filers and $20,200 for married taxpayers filing separately. It phases down by 30% of the amount by which modified adjusted gross income exceeds roughly $505,000, reaching a $10,000 floor at just over $600,000 of MAGI. The cap is scheduled to rise about 1% annually through 2029, then revert to $10,000 in 2030.

Does Florida's lack of a state income tax make the SALT cap less useful?

No — it changes what fills the cap. Florida homeowners deduct property taxes plus, optionally, state and local sales taxes. Because there's no income tax competing for cap space, a Tampa Bay property tax bill up to the cap can now be deducted in full by itemizers below the phase-down range, which was rarely possible under the old $10,000 limit.

Is mortgage interest deductible on a jumbo loan for a Tampa Bay luxury home?

Only in part. Interest is deductible on the first $750,000 of acquisition debt for loans originated after December 15, 2017, and that limit is now permanent. Interest attributable to loan balances above $750,000 is not deductible, which raises the effective after-tax cost of larger jumbo balances.

Do documentary stamp taxes at a Florida closing count toward the SALT deduction?

No. Florida's documentary stamp tax on the deed and the intangible tax on a new mortgage are transfer taxes, which the IRS excludes from the SALT deduction. They're generally added to the property's cost basis instead, which can reduce taxable gain when you eventually sell.

Will a second home in Tampa Bay get the same property tax treatment as a primary residence?

No. Only a Florida homestead receives the homestead exemptions and the Save Our Homes 3% assessment cap. A second home or investment property is protected only by the 10% non-homestead cap, which excludes school levies, so its tax bill — and the SALT deduction it generates — will typically run higher and grow faster for the same market value.

The larger point: the after-tax cost of owning a fine Tampa Bay home changed in 2025, favorably for many buyers and unevenly across income levels, and the details reward attention before you commit. If you're weighing a purchase at the $750K+ level — relocating, moving up, or starting a search — a direct conversation usually clears more up than another search.

Disclaimer: This article is for general informational purposes only and does not constitute tax, legal, or financial advice. Tax outcomes depend on your individual circumstances, and federal and state tax law can change. Figures cited reflect IRS and Florida guidance for the 2026 tax year as of the publication date. Consult a qualified CPA or tax attorney before making decisions based on this information.

About Shane Vanderson

Shane Vanderson is a License Partner and Broker Associate with Engel & Völkers South Tampa, licensed since 2012 representing buyers and sellers across Tampa Bay's luxury market. He specializes in South Tampa, Harbour Island, Hyde Park, Davis Islands, Downtown Tampa waterfront, Snell Isle, Old Northeast, Downtown St. Petersburg, the Gulf beaches, and luxury condominiums, and holds membership in Engel & Völkers' Professional Athlete Advisory. Connect with Shane at shanevanderson.com or 813-205-5430.