State and local taxes are deductible on your federal return only if you itemize deductions, and only up to $10,000 per year

You can deduct state income taxes, state sales taxes, or local property taxes on your federal tax return—but only if you choose to itemize deductions instead of taking the standard deduction. The catch: the total of all state and local taxes combined cannot exceed $10,000 in a single tax year. This $10,000 cap applies whether you pay state income tax, property tax, sales tax, or a combination of all three.

Most people do not itemize. The standard deduction for 2024 is $14,600 for single filers and $29,200 for married couples filing jointly. Unless your state and local taxes plus other deductible expenses (mortgage interest, charitable donations, medical costs) add up to more than the standard deduction, you will save more money by taking the standard deduction and not itemizing at all.

Key Takeaways

  • State income tax, property tax, and sales tax are deductible on your federal return only if you itemize deductions instead of taking the standard deduction.
  • The total of all state and local taxes you deduct cannot exceed $10,000 per tax year, regardless of how much you actually paid.
  • You must add up your state and local taxes plus other deductible expenses and compare that total to the standard deduction to decide whether itemizing saves you money.
  • If you paid estimated state taxes or had state taxes withheld from your paycheck, you deduct what you actually paid in that tax year, not what you owe.

How the $10,000 cap works

The $10,000 limit is a combined ceiling. If you paid $8,000 in state income tax and $4,000 in property tax, you can only deduct $10,000 total—not $12,000. You choose which taxes to count toward the limit to maximize your deduction. In the example above, you would deduct the full $8,000 in income tax and $2,000 of the property tax, leaving $2,000 unclaimed.

This cap has been in place since 2018 and is set to expire after 2025 unless Congress extends it. If you live in a high-tax state, this limit may mean you cannot deduct all the state and local taxes you paid. There is no carryover—unused amounts do not roll into the next year.

State income tax versus sales tax: which one to deduct

You can deduct either state income tax or state sales tax, but not both in the same year. Most people deduct state income tax because it is easier to calculate—you can use the amount withheld from your paychecks or the amount you paid with your state return. Sales tax is harder to track unless you kept receipts for every purchase.

The IRS publishes optional sales tax tables by state if you want to deduct sales tax instead of income tax. You would use the table for your state and income level, then add any major purchases (car, boat, home improvements) that you have receipts for. Few people find this method worthwhile unless they live in a state with no income tax, like Texas or Florida, and made large purchases during the year.

When itemizing makes sense

Itemizing is worth doing only if your total deductible expenses exceed the standard deduction. Add up state and local taxes (capped at $10,000), mortgage interest, property taxes, charitable donations, and medical expenses above 7.5% of your adjusted gross income. If that total is higher than the standard deduction for your filing status, itemize. If not, take the standard deduction.

High-income earners in high-tax states are most likely to benefit from itemizing. A married couple in California or New York with a mortgage, significant charitable giving, and high state income tax might easily exceed $29,200 in deductible expenses. A single person in a low-tax state with no mortgage and modest charitable giving will almost certainly come out ahead with the standard deduction.

What counts as state and local taxes you can deduct

You can deduct state income tax, local income tax (if your city or county charges it), state and local property tax, and state and local sales tax. You cannot deduct federal income tax, federal payroll taxes (Social Security and Medicare), state or federal excise taxes, vehicle registration fees, or tolls.

If you paid state estimated taxes during the year or had state tax withheld from your paycheck, you deduct the amount you actually paid in that tax year. If you filed your state return in April 2024 and owed an additional $500, you deduct that $500 in 2024 even if you did not pay it until later. If you are expecting a state tax refund, you do not deduct the full amount you paid—you deduct what you paid minus the refund you expect to receive.

Married couples and state tax deductions

Married couples filing jointly have a $10,000 combined cap on state and local taxes. You cannot split the limit between two separate returns. If you and your spouse file separately, each of you gets a $10,000 cap, but filing separately almost always results in a higher total tax bill, so this is rarely worth doing.

If you moved to a different state during the year, you may have paid income tax to two states. Both amounts count toward your $10,000 cap. Add them together and deduct up to $10,000 total.

Frequently Asked Questions

Can I deduct state taxes if I take the standard deduction?

No. The standard deduction and itemized deductions are mutually exclusive. You choose one or the other. If you take the standard deduction, you cannot deduct state taxes, mortgage interest, or any other itemized deductions. You must itemize to deduct state taxes.

What if I paid more than $10,000 in state and local taxes?

You can only deduct $10,000. The excess does not carry over to next year or reduce your federal tax in any other way. This is a hard cap. If you paid $15,000 in state income tax, you deduct $10,000 and lose the remaining $5,000.

Do I deduct state taxes I paid this year or state taxes I owe?

You deduct state taxes you paid in the tax year, regardless of when you owe them. If you filed your 2024 state return in April 2025 and owed additional tax, you deduct that amount on your 2024 federal return because you paid it in 2024. If you have not paid yet, you still deduct it in the year you paid it.

Can I deduct state taxes if I did not have any withheld?

Yes, if you paid state estimated taxes or paid your state tax bill when you filed your return. You deduct whatever you actually paid to the state, whether it came from withholding, estimated payments, or a lump sum payment with your return.

Does the $10,000 cap explore to property tax only, or all state and local taxes?

The $10,000 cap applies to the combined total of state income tax, local income tax, state and local property tax, and state and local sales tax. You cannot deduct more than $10,000 of these taxes combined, no matter how you mix them.