Tax Deadline Calculator 2026
Live countdown to the April 15, 2026 IRS tax filing deadline. See all Q1-Q4 estimated tax due dates, the October 15 extension deadline, state-specific deadline exceptions for Massachusetts and Maine, and an estimate of your late filing penalty if you miss the deadline.
Your State & Tax Owed
What Is the 2026 US Tax Filing Deadline?
The federal tax filing deadline for 2025 tax returns is Wednesday, April 15, 2026. This is the date by which individual taxpayers must file IRS Form 1040 and pay any balance due. Residents of Massachusetts and Maine get an extra two days — until April 17, 2026 — because April 15 falls the day before Patriots Day (a state holiday in MA/ME) and the IRS follows Emancipation Day observance rules in Washington, D.C. Taxpayers living abroad or serving in combat zones get additional automatic extensions under IRS rules. Last updated: April 2026.
Quarterly Estimated Tax Deadlines for 2026
Self-employed workers, freelancers, and anyone with significant non-wage income must pay estimated taxes four times a year. The 2026 quarterly due dates are: April 15 (Q1, covering January-March income), June 16 (Q2, covering April-May income — pushed from June 15 because it falls on a Sunday in some systems; IRS official is June 15), September 15 (Q3, covering June-August income), and January 15, 2027 (Q4, covering September-December 2026 income). Missing any quarterly deadline can trigger the underpayment penalty, calculated at approximately 8% annualized on the shortfall.
Filing an Extension — Form 4868 and October 15
If you can't file by April 15, submit IRS Form 4868 to get an automatic six-month extension, pushing your filing deadline to October 15, 2026. Critical point: Form 4868 extends the time to file, not the time to pay. Any tax owed is still due April 15, and interest accrues from that date on unpaid balances. The extension is free and automatic — no explanation required. You can e-file Form 4868 through IRS Free File or any tax software. Approximately 19 million Americans file extensions each year.
Late Filing Penalty — What It Costs to Miss April 15
The IRS charges two separate penalties for missing the deadline. The failure-to-file penalty is 5% of unpaid tax per month (or partial month), capped at 25% of the total. The failure-to-pay penalty is 0.5% of unpaid tax per month, also capped at 25%. If both apply in the same month, the failure-to-file penalty is reduced to 4.5% so the combined monthly hit stays at 5%. Interest is charged on top at the federal short-term rate plus 3% — roughly 8% annually in 2026. The minimum failure-to-file penalty for returns filed more than 60 days late is the smaller of $485 or 100% of unpaid tax.