Updated August 10, 2026. Quick answer. The 2027 federal income tax brackets
are not officially announced yet — the IRS publishes them via Revenue
Procedure in the fourth quarter of 2026, for use on 2027 tax returns filed in 2028. Bracket
thresholds and the standard deduction move each year based on chained CPI (C-CPI-U) inflation
indexing, a slower-growing index than the standard CPI used for some other federal figures.
What’s actually known right now
The 2027 bracket rates themselves (10%, 12%, 22%, 24%, 32%, 35%, 37%) are set by statute and
are not projected to change — what moves each year is the income threshold where
each rate starts to apply, along with the standard deduction. Both are recalculated annually
using the C-CPI-U inflation measure from the prior year’s data, a formula that’s public but whose
exact 2027 output depends on inflation data not yet fully available at the time this page was
written.
Why this uses a different inflation index than Social Security
Social Security’s COLA uses CPI-W; most federal tax figures (brackets, standard deduction,
retirement-plan limits) use chained CPI (C-CPI-U), which tends to grow slightly more slowly over
time because it accounts for consumers substituting cheaper goods as prices shift. This is a
genuinely different calculation, not just a different name for the same number — it’s part
of why COLA and tax-bracket adjustments in the same year are rarely identical percentages.
Rarely identical, and the reason is only half about the index. Over these 15 years the two adjustments matched to a tenth of a point exactly 2 times (2014 and 2020, each 0.05 points apart), and of the other 13 the tax figure was the smaller one in 8 and the larger in 5. The page above gives the index as the reason, and it is a real one: measured on the same calendar, the chained index rose more slowly than CPI-W in 12 of 15 years, by 0.31 points on average. But the two statutes also read the price data on different calendars — 26 U.S.C. § 1(f)(4) averages twelve months to August 31, while 42 U.S.C. § 415(i) compares a single third quarter to another — and holding the index constant, that calendar difference alone moved the answer by 0.58 points on average, roughly twice as much. It is what opens the two widest gaps here: in 2022 the COLA came in at 5.9% against 2.93% of tax indexing, and in 2024 the order reversed as the twelve-month average caught up a year late. Neither 2027 figure exists yet.
The rates are already settled. Only the thresholds are still moving.
That is enough to plan against. A Roth conversion, a deferred bonus or a gain taken in 2027 can be sized today against the 10%, 12%, 22%, 24%, 32%, 35% and 37% rates the statute already fixes, without waiting for the Revenue Procedure. If you want someone to price that decision against your own income rather than a projection, this is the point to ask.
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The honest timeline
Expect the official 2027 brackets and standard deduction in a Revenue Procedure released in
the final months of 2026. This page will be updated with the official figures the day they're
published, rather than carrying an unverified "2027 brackets" table months in advance the way
some projection sites already do.
The quarter is right; the month is narrower than that. Of the 15 annual inflation procedures on this record, 13 were published in November — between the 2nd and the 29th — one on December 3, and none in October, so “fourth quarter” holds as a quarter while the landing zone in the record is the first four weeks of November. Twice a statute moved it. The 2013 procedure did not arrive until March 4, 2013 — inside the tax year itself — because, as it says, its figures were the ones “specified in the American Taxpayer Relief Act of 2012.” And the 2018 figures were published on November 6, 2017 carrying a $6,500 standard deduction that a law enacted weeks later replaced; the corrected tables came out on March 5, 2018. One caveat the figure carries rather than hides: the exact day the index values are fixed cannot be shown, because BLS's release calendar refuses automated requests and no other primary source for it was read here — so September is drawn as a box, not a date.
Sources
26 U.S.C. §1 (the statutory bracket structure) and the annual inflation-indexing
mechanism under 26 U.S.C. §1(f). No 2027 figures have been published by the IRS as of this
page's last update.
Every projected figure above is attributed to the organization that published it and is explicitly not yet announced by the government body that sets it. This page will be updated with the official figure the day it is announced, and the projection will be struck through rather than deleted, so the record of what was projected vs. what actually happened stays visible. See the full current-numbers register for every figure this site tracks, dated and sourced. General information, not tax or legal advice.
The 2027 brackets are not announced, and no page can honestly give them yet. For the 2027 figures that are already settled, and the date this one is published, see what is knowable about your 2027.
