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.
Frequently Asked Questions
When is the 2026 US tax filing deadline?
The federal tax filing deadline for 2025 tax returns is Wednesday, April 15, 2026. Residents of Massachusetts and Maine have until April 17, 2026 due to Patriots Day (a state holiday) combined with Emancipation Day observance rules in Washington, D.C. Taxpayers living abroad get an automatic two-month extension to June 15, and those in federally declared disaster areas or combat zones may get additional time.
What are the 2026 quarterly estimated tax due dates?
The 2026 estimated tax deadlines are: Q1 on April 15, 2026 (for January-March income), Q2 on June 15, 2026 (for April-May income), Q3 on September 15, 2026 (for June-August income), and Q4 on January 15, 2027 (for September-December 2026 income). Self-employed workers, freelancers, and those with significant non-wage income must pay estimated taxes to avoid underpayment penalties.
What if I can't file by April 15, 2026?
File IRS Form 4868 by April 15 to get an automatic six-month extension to October 15, 2026. The extension is free, automatic, and requires no explanation. Critical: Form 4868 only extends the time to file, not the time to pay. Any tax owed is still due April 15, and interest plus the failure-to-pay penalty (0.5%/month) accrues from that date.
How much is the IRS late filing penalty?
The failure-to-file penalty is 5% of unpaid tax per month (or partial month), capped at 25% total. A separate failure-to-pay penalty of 0.5% per month also applies to unpaid tax, also capped at 25%. When both apply in the same month, the failure-to-file drops to 4.5%. Interest on unpaid tax runs at roughly 8% annually in 2026. For returns more than 60 days late, the minimum failure-to-file penalty is the smaller of $485 or 100% of unpaid tax.
Why do Massachusetts and Maine have different deadlines?
Massachusetts and Maine observe Patriots Day on the third Monday of April. When that holiday falls near April 15, the filing deadline is pushed forward. Combined with the IRS rule that recognizes Emancipation Day (April 16) as a federal holiday in Washington, D.C., residents of MA and ME get until April 17, 2026 to file their federal returns.
What happens if I owe nothing or I'm getting a refund?
If you are due a refund, there is no failure-to-file penalty because the penalty is calculated as a percentage of unpaid tax. However, you must file within three years of the original due date to claim your refund — after that, the IRS keeps the money. If you owe zero tax (no balance due), there is also no penalty, but filing on time is still required to stay compliant and preserve your rights.
Does the deadline apply to state income taxes too?
Most states that have income tax mirror the federal deadline of April 15, 2026, but some have different dates. Virginia's individual return is due May 1. Delaware and Louisiana have their own schedules. States without income tax (AK, FL, NV, SD, TN, TX, WA, WY, and NH on earned income) have no state filing requirement. Check your state revenue department for exact dates — this tool shows the federal deadline only.