The IRS Number Hub collects the federal figures TallyUp's calculators run on — tax brackets, standard deductions, mileage rates, and estimated-tax deadlines — each in its own table, each labelled with the IRS document it came from and the date we last checked it. No summaries of summaries: every dataset below names its Revenue Procedure, Notice, Announcement, or IRS release, so you can trace any number back to its source in one step.
The four datasets
How to read these pages
Each page puts the current year first and older years below it, clearly labelled as an archive, on the same stable URL — so a link you save today still resolves next year, with the new year added on top. Every table carries its source line in the form “Source: IRS Rev. Proc. 2025-32, checked October 27, 2026.” When the IRS revises a figure mid-year — as it did with the 2026 mileage rate — the page shows both periods rather than overwriting the first one. Every change to these datasets is recorded, dated and sourced, on the Tax Data Updates page.
These are reference tables, not a filing service. Figures are federal only: state brackets, deductions, rates, and deadlines differ and are not covered here.
Reference only — not tax advice. These tables reproduce figures published by the Internal Revenue Service (IRS) in TallyUp's own words and layout for planning and reference. They are not published by, affiliated with, or endorsed by the IRS. Verify any figure you rely on at irs.gov or with a qualified tax professional before filing or paying.