When is the US tax filing deadline?
Short answer
April 15, for the previous calendar year, moving to the next business day when it falls on a weekend or holiday. Form 4868 grants an automatic six-month filing extension to October 15 — but it does not extend the time to pay, and interest runs on unpaid tax from April 15.
Verified · 5 cited sources
The US tax year is the calendar year, and the individual filing deadline is April 15. State returns are separate filings with their own deadlines — most track the federal date, but not all.
The extension is the most misunderstood part. Filing Form 4868 by April 15 automatically extends the filing deadline to October 15, no reason required. It does not extend the payment deadline: tax owed is still due April 15, and interest plus a failure-to-pay penalty accrue from that date on any shortfall. Estimate and pay with the extension to stop the meter.
If you cannot pay, file anyway — the failure-to-file penalty runs about ten times the failure-to-pay penalty, so filing something is always better than filing nothing. Online payment plans are approved in minutes for most balances, and the failure-to-pay penalty is halved while an installment agreement is active.
Special automatic extensions exist: US citizens abroad get until June 15 to file (interest still runs from April 15), and combat zone service and federally declared disasters extend deadlines further.
Refunds have their own clock: you must file within three years of the original deadline to claim one, after which the money is forfeited to the Treasury. Self-employed people also face quarterly estimated payment deadlines — April, June, September and January — rather than one annual date.
- April 15 federal deadline; state returns are separate
- Extension to October 15 is automatic with Form 4868 — to file, not to pay
- Failure-to-file penalty ≈ 10× the failure-to-pay penalty: always file
- Citizens abroad get June 15 automatically; disasters extend further
- Refunds are forfeited if unclaimed within three years
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Sources & provenance
Facts verified
- 1.When to file OfficialInternal Revenue ServiceUsed for: April 15 deadline and weekend/holiday rollover
- 2.Extension of time to file OfficialInternal Revenue ServiceUsed for: Automatic extension to file, not to pay
- 3.Failure to file penalty OfficialInternal Revenue ServiceUsed for: Relative size of filing and payment penalties
- 4.US citizens abroad OfficialInternal Revenue ServiceUsed for: Automatic June 15 extension with interest from April 15
- 5.Estimated taxes OfficialInternal Revenue ServiceUsed for: Quarterly payment deadlines
All deadlines and penalty relationships come from the IRS pages cited. Disaster-related extensions are announced per event on IRS.gov. The advice to always file even when unable to pay is standard IRS guidance restated.
Facts on this page are taken from the sources listed above — U.S. federal agencies, state governments, regulators and official statistical releases. Comparisons, judgments and "which option suits whom" conclusions are AI-assisted analysis written over those sources; they are marked in the text and listed as an AI-analysis entry in the sources, not attributed to any authority. Rates, thresholds, fees and processing times change, often at the start of a calendar or tax year; figures are current as of the review date shown and should be confirmed with the responsible agency before you rely on them. A great deal of American law is state law — where a rule differs by state, this site says so.