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The 2026 Form 4868 isn't out yet. The IRS usually posts it in December or January, and our free form opens for 2026 returns the same week. Your 2026 extension is due April 15, 2027. See all deadlines.

How we source and review

Every rule, date and address on Form4868.org comes from an IRS form, an IRS publication or an IRS.gov page. Here's each source and where we use it.

Last updated: October 25, 2026

Our rules

  • IRS first. Facts come from the IRS: Form 4868 and its instructions, IRS publications, or an IRS.gov page.
  • Linked on the page. Every guide lists its sources at the bottom, next to the date we last reviewed it.
  • No made-up numbers. No invented statistics, reviews or testimonials. Worked examples are labeled as examples.
  • If we differ from the IRS, the IRS wins. Tell us through the contact form and we'll fix it.

When we review

Every January, before the filing season, we check IRS.gov for the new tax year's Form 4868. We recheck every mailing address, the deadlines and the IRS's electronic payment and Free File extension options, and update the penalty amounts the IRS adjusts each year. Then we update the last-reviewed date on every page that changed. We also recheck pages when the IRS announces a change.

What the form-filler uses

DataFromLast verified
The IRS PDF we fill in2025 Form 4868, from IRS.gov, unchangedOctober 25, 2026
Mailing addressesWhere To File a Paper Form 4868, 2025 Form 4868October 25, 2026
Due dates and holidays2025 Form 4868 (When To File) and Publication 509October 25, 2026

Form 4868

IRS publications and topics

Other IRS forms

IRS.gov pages