Yes, state income taxes can be deductible on your federal return, but only if you itemize deductions and only up to the State and Local Tax (SALT) cap, which is currently much higher than it was a few years ago. They are not deductible at all if you use the standard deduction instead of Schedule A.

The basic rule

  • State and local income taxes are one type of SALT you can deduct on Schedule A (Form 1040) if you itemize.
  • You must choose between deducting state and local income taxes or state and local general sales taxes; you cannot deduct both for the same year.
  • If you take the standard deduction, you do not get any separate deduction for state income tax paid.

The SALT cap (how much you can deduct)

  • State and local taxes (income or sales), plus real estate and certain personal property taxes, are grouped together under the SALT deduction.
  • The overall SALT deduction limit, which used to be 10,000 dollars for many years, has been increased for recent tax years (for example, to 40,000 dollars in 2025) for taxpayers who itemize, especially benefiting those in high‑tax states.
  • High‑income taxpayers may see the benefit of itemized deductions, including SALT, phased down once income passes certain thresholds.

When the deduction actually helps

  • The state income tax deduction only helps if your total itemized deductions (SALT, mortgage interest, charitable giving, etc.) exceed your standard deduction for the year.
  • Many taxpayers with modest SALT amounts get more benefit from simply taking the standard deduction instead of itemizing.

Refunds and future-year income

  • If you deducted state income taxes in a prior year and then get a state tax refund , some or all of that refund may be taxable on your federal return in the year you receive it, under the “tax benefit rule.”
  • The refund is reported on Form 1099‑G and may need to be included as income, but only to the extent that the original deduction actually reduced your federal tax (for example, amounts above the SALT cap might not have given any benefit).

Quick HTML table summary

[3][10][7] [10] [3][5][7] [2][6][1]
Question Short answer
Are state income taxes deductible on a federal return? Yes, if you itemize on Schedule A and stay within the SALT cap.
Can you deduct them with the standard deduction? No, the standard deduction replaces itemized deductions, including state income tax.
Is there a dollar limit? Yes, all SALT (income or sales, property, etc.) are subject to an overall cap for the year.
What if you get a state tax refund? It may be taxable as income in the year received if the original deduction reduced your federal tax.

Information gathered from public forums or data available on the internet and portrayed here.