What Is a Sales Tax Deduction and How Does It Work?

The sales tax deduction lets you subtract the state and local general sales taxes you paid during the year from your federal taxable income, but only if you itemize on Schedule A and only in place of deducting your state and local income taxes. For 2026, it sits inside a combined state and local tax (SALT) cap of $40,400 for most filers, along with property tax and whichever income-or-sales-tax option you choose. It tends to matter most if you live in a state without an income tax or if you had a year of unusually heavy spending.

You Pick Sales Tax or Income Tax, Not Both

Federal law forces a choice each year: deduct the state and local income taxes you paid, or the state and local sales taxes you paid, but never both in the same tax year.¹ The election is made on Schedule A, so you can switch from one to the other year to year depending on which produces the larger deduction.²

The comparison itself is simple. Add up your state and local income tax paid, visible on your W-2 or in your quarterly estimated payments. Compare that to your total sales tax paid or estimated. Whichever is higher is the one to claim. The overall SALT cap is the same either way, so the election only decides which type of tax fills that space alongside your property tax.

Who Comes Out Ahead With Sales Tax

Eight states levy no individual income tax at all. Residents there have nothing on the income-tax side of the ledger, so the sales tax deduction is effectively their only path to a state tax deduction on the federal return.

The sales tax option can also win in a state that does have an income tax, if you had a year of large purchases. Buying a car, a boat, or building materials for a major home project can push your sales tax total above what you paid in state income tax. Some retirees benefit too. If most of your income is Social Security or tax-exempt, your state income tax bill may be small even when your taxable spending isn’t.

The 2026 SALT Cap

The One Big Beautiful Bill Act raised the SALT cap for 2026 to $40,400 for single filers and for married couples filing jointly. Married filing separately is half that, at $20,200. The cap covers your chosen income-or-sales-tax deduction plus your property tax, added together in the state-and-local-tax section of Schedule A. If you already deduct $25,000 in property taxes, you have $15,400 of room left for sales tax before hitting the ceiling.

Higher earners face a phasedown. Once your modified adjusted gross income passes $505,000, the cap shrinks by 30 cents for every dollar above that threshold, down to a floor of $10,000. That floor is reached at roughly $606,000 of MAGI. If your income is anywhere near these numbers, running the calculation both ways is worth the effort.

Itemizing Has to Beat Your Standard Deduction First

None of this matters if you take the standard deduction. For 2026, the standard deduction is $16,100 for single filers and married filing separately, $32,200 for married couples filing jointly, and $24,150 for heads of household.³ Your itemized deductions — mortgage interest, charitable gifts, medical expenses, and the whole SALT bundle combined — need to clear that number for itemizing to pay off.

For a lot of taxpayers, that’s the point where interest in the sales tax deduction ends. Where it can still tip the balance is when you already have a mortgage, live in a high-property-tax area, or gave meaningful charitable contributions, and the sales tax figure is the piece that pushes the total past the standard deduction.

Two Ways to Calculate What You Paid

The IRS lets you figure the deduction two ways: actual expenses or the optional sales tax tables.¹

Actual Expenses

Add up every dollar of general sales tax you paid during the year. This means keeping receipts for essentially every taxable purchase over the entire year. Most people find that impractical, but if you kept careful records and shop in a high-tax jurisdiction, the actual-expense method can produce a larger figure than the tables.

The Optional Sales Tax Tables

The more common route is the IRS’s optional sales tax tables, which estimate your annual sales tax from your income, filing status, and number of dependents. The IRS has a Sales Tax Deduction Calculator online where you enter your filing status, adjusted gross income, ZIP code, and information about any large purchases, and it produces the deduction figure using your state and local tax rates.⁴

You can also combine the two: use the table-based estimate for everyday spending, then add actual sales tax paid on qualifying big-ticket items on top. That combination is what most itemizers end up using.

Big-Ticket Items You Can Add On Top

Certain large purchases get separate treatment because the tables don’t account for them. The Schedule A instructions list these categories:⁵

Motor vehicles: cars, motorcycles, motor homes, recreational vehicles, trucks, vans, and off-road vehicles. Sales tax on leased vehicles counts. If your state charges a higher sales tax rate on vehicles than its general rate, you can only deduct the amount that would have applied at the general rate.
Aircraft and boats, deductible only if the sales tax rate matched the general rate.
Homes and major renovations, including mobile homes, prefabricated homes, substantial additions, and major renovations, again only if the tax rate matched the general sales tax rate. Sales tax you paid directly on building materials you purchased yourself can be included.

Keep the invoice or bill of sale for each item showing the sales tax amount. Even one large purchase can meaningfully increase your deduction beyond the table estimate.

Use Tax Counts

If you bought something from an out-of-state or online seller and paid your state’s use tax rather than sales tax, that amount also qualifies. Federal law treats compensating use taxes the same as general sales taxes, as long as the use tax is complementary to your state’s general sales tax and applies to similar items.⁶ Many states now collect it automatically through online retailers, so check your state return; some include a line for use tax on untaxed purchases, and that amount can be folded into your federal sales tax deduction.

Reporting It on Schedule A

Check the box on line 5a of Schedule A (Form 1040) indicating you’re choosing sales tax instead of income tax, and enter your total sales tax deduction on that line.² If you used the IRS calculator, its worksheet feeds directly into that number.⁷ Property taxes go on a separate line, and the form totals everything subject to the SALT cap.

Hold onto your records for at least three years from the date you filed the return, or two years from when you paid the tax, whichever is later.⁸ For sales tax, that means receipts for big-ticket items, a copy of the calculator worksheet if you used it, and any use-tax documentation from your state return. If you used the actual-expense method, keep the receipts organized by month in case the IRS asks to see them.

What Doesn’t Belong Here: Business Purchases

Sales tax on items you use in your business does not go on Schedule A. That tax is treated as part of the item’s cost basis and recovered through depreciation instead.⁹ The Schedule A instructions say specifically not to include sales taxes paid on items used in your trade or business.⁵

You also cannot claim the same sales tax in two places. If you elect the sales tax deduction on Schedule A, you can’t also capitalize that tax into a business asset’s depreciable basis. For a vehicle or piece of equipment used partly for business and partly personally, split the sales tax accordingly: the personal-use portion goes on Schedule A, the business-use portion gets added to basis.¹⁰

1
Internal Revenue Service. Topic No. 503, Deductible Taxes
2
Internal Revenue Service. Instructions for Schedule A (Form 1040) (2025)
3
Internal Revenue Service. IRS Releases Tax Inflation Adjustments for Tax Year 2026
4
Internal Revenue Service. Sales Tax Deduction Calculator
5
Internal Revenue Service. Instructions for Schedule A (Form 1040) (2025)
6
Office of the Law Revision Counsel. 26 USC 164 – Taxes
7
Internal Revenue Service. Use the Sales Tax Deduction Calculator
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Internal Revenue Service. How Long Should I Keep Records
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Internal Revenue Service. Publication 946 (2024), How to Depreciate Property
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Internal Revenue Service. Topic No. 510, Business Use of Car