The SALT Deduction — How to Deduct Property Taxes on Your Federal Return

Property taxes and federal income taxes intersect at exactly one place on your return: the SALT deduction. For homeowners in high-tax states, understanding how this deduction works — and how a cap now limits it — can mean the difference between a meaningfully smaller tax bill and a deduction that barely moves the needle. Here is what SALT actually covers, who it helps, and how to make the most of it within the current rules.

What SALT actually stands for

SALT stands for State And Local Taxes, and it is a category on Schedule A that lets taxpayers who itemize deduct certain taxes they have already paid to state and local governments from their federal taxable income. It is not one single tax — it is a bundle that includes state and local property taxes, plus a choice between deducting state and local income taxes or state and local sales taxes, whichever is larger for your situation. For most homeowners, the property tax portion is the piece that matters most.

The SALT cap: where it came from and how it changed in 2025

Before 2018, there was no dollar limit on how much SALT a taxpayer could deduct — a homeowner paying $30,000 in combined state income and property taxes could deduct the full $30,000. The Tax Cuts and Jobs Act of 2017 changed that, capping the total SALT deduction at $10,000 per return starting with the 2018 tax year, combining property taxes and either income or sales taxes into that single ceiling. That $10,000 cap remained in place through 2024, disproportionately affecting homeowners in states with both high property tax rates and high state income tax rates, since those two categories competed for the same limited allowance rather than each being separately unlimited.

In July 2025, Congress passed the One Big Beautiful Bill Act (OBBBA), which substantially increased the SALT cap starting immediately. For the 2025 tax year, the cap rose to $40,000 per return ($20,000 for married filing separately). For the 2026 tax year, it increased further to $40,400 ($20,200 MFS), with the cap scheduled to rise by 1% annually thereafter. However, the increased cap is not unlimited for high earners: for taxpayers with modified adjusted gross income (MAGI) above $505,000 in 2026 ($500,000 in 2025), the cap begins to phase down by 30% of the excess income, eventually reaching a floor of $10,000 ($5,000 MFS) for those with MAGI around $606,333 or higher. Unless Congress extends it, the cap is scheduled to revert to $10,000 ($5,000 MFS) starting in 2030.

Standard deduction vs itemizing: why the math has shifted

The same 2017 tax law that introduced the original SALT cap also roughly doubled the standard deduction, which for the 2026 tax year sits at $16,100 for single filers, $32,200 for married couples filing jointly, and $24,150 for head of household filers. Because the standard deduction is now so much larger, a taxpayer needs a substantial amount of itemizable expenses — mortgage interest, charitable giving, and SALT among them — before itemizing actually beats simply taking the standard deduction. However, with the SALT cap now at $40,400 for 2026, far more homeowners can deduct their full property tax bill without hitting the ceiling, making itemization worthwhile for a broader group than was the case from 2018 through 2024.

The math: when itemizing wins, with worked examples

Consider a married couple filing jointly with $18,000 in property taxes, $8,000 in mortgage interest, and $2,000 in charitable donations — a total of $28,000 in itemized deductions. Since $28,000 falls short of the $32,200 standard deduction for 2026, this couple is better off taking the standard deduction and the SALT deduction provides zero net benefit. Now consider a couple with a larger, higher-rate mortgage and higher property taxes: $18,000 in property taxes, $18,000 in mortgage interest, and $3,000 in charitable giving, totaling $39,000. That comfortably exceeds the $32,200 standard deduction, so itemizing saves them $6,800 of additional deductible expense beyond what the standard deduction alone would provide — a meaningful benefit driven by the combination of a large mortgage and a substantial property tax bill that is now fully deductible under the new $40,400 cap. Under the old $10,000 cap, this same couple would have been able to deduct only $10,000 of their $18,000 property tax bill, resulting in total itemized deductions of $31,000 and a much smaller tax benefit.

Which property taxes count — and which don't

Property taxes on your primary residence qualify for the SALT deduction on Schedule A, and so do property taxes on a second home or vacation property, though both count toward the same shared $40,400 cap ($20,200 MFS for 2026) rather than each getting their own allowance. Taxes on vacant land you own personally can also qualify. What does not belong on Schedule A is property tax on a rental property you own as a business — that expense is deducted instead on Schedule E as a rental expense against rental income, entirely separate from the SALT cap, which is actually good news for landlords, as explained further below.

High-tax state impact: New Jersey, New York, California, Illinois

The states hit hardest by the original $10,000 SALT cap — New Jersey, New York, California, and Illinois — shared a common profile: high property tax rates, high state income tax rates, or both. With the cap now at $40,400 for 2026, the situation has changed dramatically for most homeowners in these states. A New Jersey homeowner who previously owed $25,000 in property taxes and faced a $10,000 cap can now deduct the full amount. A New York or California resident with $30,000 in combined property and state income taxes can now deduct it all. The SALT cap no longer binds for the vast majority of middle- and upper-middle-income homeowners in these high-tax states. However, the cap does still matter for very high earners: a household in New Jersey or New York with MAGI above $505,000 will see the cap phase down, and those with MAGI significantly above $606,333 will find themselves back at the $10,000 floor. For these high-income taxpayers, the cap remains a meaningful constraint.

Married filing separately: the $20,200 cap and why it still matters

One frequently overlooked detail of the SALT cap is that it does not simply divide in half evenly for married couples who choose to file separately — instead, the cap for each spouse filing separately is set at $20,200 for 2026 (half the $40,400 joint cap), for a combined total that matches the joint cap only if both spouses have exactly matching deductible expenses. Couples considering separate filing for other tax reasons should run the numbers carefully, since splitting SALT unevenly between two $20,200 caps can sometimes leave more total deduction unused than filing jointly would. Additionally, the phase-out for high earners applies at $252,500 MAGI for MFS filers (half the $505,000 joint threshold), meaning married couples filing separately who are high earners face the phase-down sooner and more steeply than joint filers.

Rental and business property: deducting outside the cap entirely

If you own rental real estate, the property taxes on that rental are a legitimate business expense deducted directly against your rental income on Schedule E, with no connection to the SALT cap whatsoever. This is one of the more significant, and often underused, planning distinctions available to real estate investors: a landlord with several rental properties can deduct the full property tax bill on each one without any ceiling, even while their personal residence's property taxes are constrained by SALT. The same logic extends to property used for a legitimate business, such as a home office allocation or a standalone commercial building.

Timing strategies: prepaying within the rules

Some taxpayers try to prepay the following year's property tax installment before December 31st in an attempt to claim it in the current tax year — a strategy that predates the SALT cap and became far less useful after it. The IRS has clarified that prepaid property taxes are only deductible in the year paid if they have already been formally assessed by the local government before payment; prepaying an estimate for taxes not yet assessed does not qualify. With the SALT cap now at $40,400 for 2026, far fewer taxpayers are actually hitting the cap, making this timing strategy largely irrelevant for most homeowners. However, it can still matter for very high earners whose MAGI is near or above the $505,000 phase-out threshold, where shifting payment timing between years might help manage the phase-down. For most filers, the cap is no longer the binding constraint it was from 2018 through 2024.

Where to claim it: the Schedule A walkthrough

If you are itemizing, property taxes are reported on Schedule A, line 5b, where you enter state and local real estate taxes. Line 5a captures state and local income or sales taxes, and line 5d totals the combination — capped at $40,400 for 2026 ($20,200 if married filing separately), subject to phase-down for MAGI above $505,000 ($252,500 MFS), before it flows to line 7 and ultimately reduces your taxable income on Form 1040. Your mortgage servicer's Form 1098 or your county tax bill will show the exact amount paid during the calendar year, which is the figure to use regardless of which tax year the payment was assessed for. If your MAGI exceeds $505,000, you will need to calculate the phase-down reduction: subtract $505,000 from your MAGI, multiply by 30%, and reduce your cap by that amount, with a floor of $10,000 that it cannot go below.

Sources: Tax Foundation, IRS Schedule A guidance

This guide is for general educational purposes only and is not legal or financial advice. Verify all figures with your local county assessor's office.