The One Big Beautiful Bill Act is temporarily quadrupling the state and local tax deduction to at least $40,000, up from $10,000, for the next five years. Now it’s up to taxpayers to see if they can take advantage of this extra write-off, which is popularly referred to as the SALT deduction.

The new law lifts what had been a $10,000 cap to $40,000 for tax year 2025 and then adjusts it upward by 1% a year for 2026, 2027, 2028 and 2029.