If you’ve ever paid property taxes, state income taxes, or sales taxes, you may have wondered whether any of that money comes back to you at tax time. The answer, for some people, is yes — through something called the SALT deduction. It’s a federal tax provision that has been at the center of political debate for years, and it recently underwent major changes. Here’s what it is, how it works, and whether it’s likely to affect you.
The Basics: What SALT Stands For
SALT stands for state and local taxes. The SALT deduction allows taxpayers who itemize their federal tax return to subtract certain state and local taxes they’ve paid from their federally taxable income. This lowers the amount of income subject to federal tax, which can reduce what you owe the IRS.
The taxes that qualify include state and local income taxes, real estate property taxes, and personal property taxes. Taxpayers who live in states without an income tax — like Florida or Texas — can choose to deduct state and local sales taxes instead, but the IRS requires you to pick one or the other. You cannot deduct both income taxes and sales taxes.
Why It Exists
The SALT deduction has roots going back to the earliest days of the federal income tax in the early 20th century. The original logic was straightforward: if a portion of your income is already taken by state and local governments, you shouldn’t have to pay federal tax on that same money. It was an attempt to avoid double taxation.
States and local governments use these tax revenues to fund schools, roads, emergency services, and other public infrastructure. The federal deduction was historically viewed as a way to support those systems indirectly, by making it less painful for residents to pay into them.
How It Works in Practice
To claim the SALT deduction, you must itemize your deductions on Schedule A of your federal tax return rather than taking the standard deduction. This is an important threshold, because itemizing only makes sense when your total deductible expenses — including SALT, mortgage interest, charitable contributions, and others — add up to more than the standard deduction for your filing status.
For 2025, the standard deduction is $15,750 for single filers and $31,500 for married couples filing jointly. If your itemized deductions don’t clearly exceed those numbers, the standard deduction is likely the better choice.
The dollar savings from SALT depend on your marginal tax bracket. If you’re in the 24% bracket and you can deduct $20,000 in state and local taxes, that deduction saves you roughly $4,800 in federal taxes.
The $10,000 Cap: What Happened in 2018
Before 2018, there was no limit on how much you could deduct under SALT. High earners in high-tax states sometimes claimed deductions of $30,000 or more. That changed with the Tax Cuts and Jobs Act (TCJA), signed into law in December 2017. The TCJA imposed a $10,000 annual cap on SALT deductions ($5,000 for married individuals filing separately), effective for tax years 2018 through 2024.
The cap hit residents of high-tax states — particularly California, New York, New Jersey, and Connecticut — hardest. Homeowners in those states often pay $15,000 or more in property taxes alone, before accounting for state income taxes. The $10,000 limit meant they were leaving significant deductions on the table.
The TCJA also nearly doubled the standard deduction at the same time, which caused the share of Americans who itemized to fall sharply — from about 31% of filers in 2017 to roughly 9% in the years following.
The 2025 Change: The Cap Jumps to $40,000
The SALT deduction landscape changed again in 2025. President Trump signed the One Big Beautiful Bill Act into law on July 4, 2025, which raised the SALT deduction cap from $10,000 to $40,000 for most filers ($20,000 for married filing separately) for tax years 2025 through 2029. The cap increases by 1% each year during that period — so it becomes $40,400 in 2026, and so on through 2029. Starting in 2030, the cap is set to revert to $10,000 unless Congress passes new legislation.
This is a significant expansion. For someone paying $25,000 in state income taxes and $15,000 in property taxes, the old $10,000 cap meant losing $30,000 worth of deductions entirely. Under the new rules, that same filer can deduct the full $40,000.
Who Benefits and Who Doesn’t
The SALT deduction has never been equally distributed. Before the TCJA, 91% of the benefit was claimed by households earning more than $100,000, concentrated in a handful of states: California, New York, New Jersey, Illinois, Texas, and Pennsylvania. The expanded cap doesn’t change that basic dynamic.
The new $40,000 cap comes with an income-based phaseout. For tax year 2025, the full deduction is available to filers with a modified adjusted gross income (MAGI) of $500,000 or less. Above that threshold, the cap is reduced by 30 cents for every dollar of income over $500,000. The deduction never falls below $10,000, regardless of income. Taxpayers with a MAGI above $600,000 effectively face the same $10,000 limit as before.
That phaseout creates an odd situation for filers earning between $500,000 and $600,000: their effective tax rate on that income can spike sharply, a phenomenon some tax professionals have dubbed the “SALT torpedo.”
What the SALT Debate Is Really About
SALT has been politically contentious because it doesn’t benefit everyone equally. Residents of lower-tax states — many in the South and Midwest — get little or nothing from it. Critics argue that the deduction, in effect, lets residents of high-tax states offset some of their local tax burden at everyone else’s expense. Supporters counter that without it, residents of states with robust public services face a form of double taxation.
The 2017 cap was defended partly on fiscal grounds — limiting it raised federal revenue to offset tax cuts elsewhere in the law. The 2025 expansion, by contrast, is expected to reduce federal revenues substantially.
What This Means for Your Taxes
If you own a home, pay significant state income taxes, and live in a higher-tax state, it’s worth revisiting whether itemizing makes sense for your 2025 return. The higher cap makes itemizing a viable option for more people than it has been since 2017.
A few practical considerations: you can only deduct SALT in the year you actually paid the taxes, not when they were assessed. Some taxpayers prepay property taxes or accelerate estimated state tax payments before December 31 to maximize their deduction in a given year. And as always, the decision to itemize versus take the standard deduction should be based on your total picture — not just SALT.
If your tax situation involves significant property and state income taxes and you’re unsure whether to itemize, consulting a tax professional or financial advisor is a reasonable step. The changes introduced in 2025 are meaningful enough that the math may look different than it has for the past several years.
Winchell House 
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