On a yearly basis, the Internal Revenue Service (IRS) adjusts more than 60 tax provisions for inflation to prevent what is called “bracket creep.” Bracket creep occurs when inflation, rather than real increases in income, pushes people into higher income tax brackets or reduces the value they receive from credits and deductions.The IRS previously used the Consumer Price Index (CPI) as a measure of inflation prior to 2018. However, with the Tax Cuts and Jobs Act of 2017 (TCJA), the IRS now uses the Chained Consumer Price Index (C-CPI) to adjust income thresholds, deduction amounts, and credit values accordingly.The One Big Beautiful Bill Act (OBBBA), passed in July 2025, made permanent most of the TCJA individual tax provisions scheduled for expiration at the end of 2025 and made other changes to individual taxes that will impact tax parameters for the 2026 tax year.The new inflation adjustments are for tax year 2026, for which taxpayers will file tax returns in early 2027. On average, tax parameters that are adjusted for inflation will increase by about 2.7 percent.
