Visit https://www.irs.gov/businesses/small-businesses-self-employed/tax-calendar for more deadlines.
Check often for new events year round.
For returns filed for calendar year 1/1/25 through 12/31/25 income tax returns
IRS officially opens for the calendar year 2025 Tax Filing Season and E-File.
For employers, businesses, and those who issue tax forms to workers, including W-2, 1099-NEC, 1099-K, 1099-MISC.