Data
Downloads
Every table on this site as CSV, rebuilt daily at stable URLs.
| File | Contents |
|---|---|
| federal-deadlines-2026.csv | Every federal tax deadline for 2026 (date, category, description). |
| federal-deadlines-2027.csv | Every federal tax deadline for 2027 (date, category, description). |
| state-tax-deadlines.csv | State business tax filing table for all 50 states and DC: corporate, pass-through and sales tax dates, other business taxes, checked date, and source URLs. |
| irs-disaster-relief.csv | Every release in the IRS disaster relief index with the parsed postponed date, state, and event; year_inferred marks dates whose year came from the release year. |
Columns
federal-deadlines-YYYY.csv: date (ISO, already shifted for weekends and federal holidays), category, deadline.
state-tax-deadlines.csv: one row per jurisdiction; entry_verified is the date that row was confirmed against a primary source, or UNVERIFIED.