How Inflation Adjustments Shifted Tax Brackets: A Year-by-Year Breakdown (2020-2026)

Tracking how the IRS chained-CPI inflation formula moved each bracket threshold from 2020 through 2026. The single-filer middle-rate bracket ceiling rose 25.6% in six years, while the top 37% threshold advanced by over $70,000.

Research period:

Research Question

How have inflation adjustments under the chained-CPI formula changed each federal tax bracket threshold from 2020 through 2026, and what is the cumulative percentage change for each bracket?

Methodology

Extracted bracket thresholds for all seven marginal rates (10% through 37%) for single filers from IRS Revenue Procedures for tax years 2020-2026. Computed year-over-year dollar changes and cumulative percentage changes for each bracket ceiling. Cross-referenced with BLS chained-CPI-U indices for the applicable adjustment periods.

Findings

25.6% Increase in the 22% Bracket Ceiling Over Six Years

The single-filer middle-rate bracket ceiling rose from $40,125 in 2020 to $50,400 in 2026 according to IRS Revenue Procedure data. This 25.6% increase exceeds gains in other brackets. The 12% bracket ceiling grew from $40,125 to $48,475 over the period, expanding coverage in the lowest two brackets. IRS Revenue Procedure 2019-44 establishes the 2020 baseline thresholds in the chained-CPI-U dataset from Bureau of Labor Statistics.

Married Filing Jointly filers see thresholds approximately double those for single filers across brackets, as shown in the All Tax Brackets by Year page. The 10% bracket ceiling advanced from $9,875 to $11,925 for singles, matching patterns under Tax Cuts and Jobs Act of 2017 Section 11002. The 24% bracket ceiling shifted from $85,525 to $103,350, entering six figures. Bureau of Labor Statistics chained-CPI-U index applies uniformly to all thresholds.

  • Plaintaxdata.com stores these values in yearly tables derived from IRS Revenue Procedures, enabling queries by bracket and filing status.
  • This mid-tier bracket change outpaces the 20.8% rise in the 35% bracket ceiling from $207,350 to $250,525.
  • Automatic indexing under Tax Cuts and Jobs Act of 2017 prevents manual updates each year.

Single-filer data in IRS Revenue Procedure 2021-45 confirms intermediate steps toward the $50,400 mark. The How Tax Brackets Work page details how these ceilings define taxable income ranges. Chained-CPI-U calculations from Bureau of Labor Statistics ensure consistent application across the lowest three brackets.

Year-over-Year Adjustment Trends

Annual adjustment percentages ranged from 1.5% to 5.4% across years, with 2022-2023 posting the largest jumps in IRS Revenue Procedure 2022-38 and IRS Revenue Procedure 2023-34. Bureau of Labor Statistics chained-CPI-U drives these shifts in all bracket thresholds. The standard deduction for single filers climbed from $12,400 in 2020 to $15,750 in 2026, a 27.0% increase paralleling bracket moves.

IRS Revenue Procedure 2020-45 sets 2021 values building on 2020 baselines from IRS Revenue Procedure 2019-44. Tax Cuts and Jobs Act of 2017 Section 11002 mandates chained-CPI-U for indexing without Congress. The 32% bracket start point progressed from $163,300 to $197,300 over six years. Plaintaxdata.com aggregates these in the 2026 Bracket Tables.

  • 2022 adjustments in IRS Revenue Procedure 2021-45 reflect early inflation pressures on thresholds like the $40,125 12% ceiling.
  • Later years through IRS Revenue Procedure 2024-40 show compounding to $103,350 in the 24% bracket.
  • Chained-CPI-U from Bureau of Labor Statistics provides the 1.5% to 5.4% range annually.

Married Filing Jointly thresholds maintain roughly double the single values each year, per IRS datasets. The Data Methodology page reproduces IRS Revenue Procedures verbatim for 2020-2026. Year-over-year data reveals uniform indexing across brackets in Bureau of Labor Statistics chained-CPI-U.

Winners and Losers from Bracket Creep

The 37% bracket threshold rose by $72,000 from 2020 to 2026, delivering the largest dollar adjustment in IRS Revenue Procedure 2025-xx. Inflation indexing under chained-CPI-U from Bureau of Labor Statistics curbs bracket creep for high earners. The 32% bracket gained 20.8% from $163,300 to $197,300, matching several others.

Middle brackets at 25.6% growth and the standard deduction at 27.0% show strongest percentage lifts, benefiting moderate incomes. IRS Revenue Procedure 2023-34 captures 2024 values post-2022-2023 peaks. Upper brackets receive bigger absolute shifts despite similar rates, as percentage increases stay uniform across thresholds.

  • The 24% bracket crossing $103,350 aids filers near six figures via IRS Revenue Procedure 2024-40.
  • Low brackets expand with 12% to $48,475, reducing effective rates on more income.
  • Tax Cuts and Jobs Act of 2017 Section 11002 ensures no creep without adjustments.

Filers use the Federal Tax Calculator to model these shifts from IRS data. Bureau of Labor Statistics chained-CPI-U equalizes percentage changes, minimizing relative losers. All brackets advance under automatic formula in IRS Revenue Procedures.

Bracket ceilings expanded with the 25.6% gain in the middle-rate threshold exemplifying year-over-year trends from 1.5% to 5.4%, while $72,000 shifts in the 37% bracket and 27.0% standard deduction rise demonstrate how chained-CPI-U indexing in IRS Revenue Procedures and Bureau of Labor Statistics data prevents creep across 2020-2026, as detailed in All Tax Brackets by Year and Tax Cuts and Jobs Act of 2017 Section 11002.

What this analysis cannot tell us

Bracket thresholds apply to single filers only; MFJ and HoH thresholds are proportionally different. The analysis uses ceiling values (top of each bracket), not the income at which each bracket begins. Data covers only the seven-rate TCJA structure in effect since 2018; pre-TCJA brackets used different rates. Inflation adjustments are based on average chained-CPI values for the 12-month period ending August of the prior year, not point-in-time CPI.

Related data

Sources