Filing Deadline Calculator
Tax Day moves every year, and it is different for individuals, partnerships, S corporations, and C corporations. Pick your tax year and filing type below to get your exact federal filing deadline, your automatic extension deadline, and how many days you have left from today.
2026 tax year: key federal deadlines
These are the standard IRS deadlines for tax year 2026 (returns filed in 2027). The calculator above applies them to your exact situation:
| Filer | Regular deadline | With extension |
|---|---|---|
| Individual (Form 1040) | April 15, 2027 | October 15, 2027 |
| Business / sole proprietor (Schedule C) | April 15, 2027 | October 15, 2027 |
| Partnership (Form 1065) | March 15, 2027 | September 15, 2027 |
| S corporation (Form 1120-S) | March 15, 2027 | September 15, 2027 |
| C corporation (Form 1120) | April 15, 2027 | October 15, 2027 |
Individuals request an extension with Form 4868; partnerships, S corporations, and C corporations use Form 7004. Both forms must be filed by the regular deadline.
How to use this calculator
- Choose the tax year the return covers. The current season is tax year 2026, filed in 2027.
- Pick your filing type. Pass-through businesses file earlier (March) than individuals and C corporations (April).
- Add any special circumstances: disaster relief, military service, or living abroad can change your date.
- Press Calculate my deadline to see your filing deadline, your extension deadline, and the exact number of days remaining.
Worked example
Sara is a freelancer filing as an individual for tax year 2026. She selects tax year 2026, “Individual return (Form 1040)”, and no special circumstances. The calculator shows a filing deadline of April 15, 2027, an extension deadline of October 15, 2027 (via Form 4868), and a live days-remaining count. Her brother runs a partnership, so he selects “Partnership (Form 1065)” and gets March 15, 2027 with an extended deadline of September 15, 2027 (via Form 7004), a full month earlier than Sara.
What other deadline tools miss
Most tax deadline pages are static calendars: they list April 15 and stop. They rarely separate partnership and S corporation deadlines (March, not April), almost never add a live days-remaining countdown from today’s date, and they skip the special-circumstance rules for disaster areas, military service, and Americans abroad entirely. This page combines the deadline table with an interactive tool that applies all of it to your situation, so you do not have to translate a generic calendar into your own date.
Frequently asked questions
When is the tax filing deadline for 2026?
For tax year 2026, individual federal returns are due April 15, 2027. Partnership and S corporation returns are due March 15, 2027. These are the standard dates; weekend and holiday shifts or disaster relief can move a specific year’s date.
How do I get a tax extension?
Individuals file Form 4868 by the regular deadline for an automatic 6-month extension to October 15. Partnerships, S corporations, and C corporations file Form 7004. An extension gives you more time to file, not more time to pay: any tax you owe is still due on the regular deadline, and interest accrues from then.
What happens if I miss the filing deadline?
The failure-to-file penalty is generally 5% of unpaid tax for each month (or part of a month) the return is late, up to 25%, plus interest on the unpaid balance. Filing even a late return is almost always cheaper than not filing, because the penalty is calculated on the return you submit.
Do I get extra time if I live outside the US?
Yes. US citizens and resident aliens living abroad get an automatic 2-month extension to June 15 without filing any form. You can request a further extension to October 15 with Form 4868. Interest still runs from the April deadline on any unpaid tax.
What is the deadline for partnership and S corporation returns?
Partnerships (Form 1065) and S corporations (Form 1120-S) file one month earlier than individuals: March 15 (March 16, 2026 for tax year 2025, because March 15 fell on a Sunday). Filing Form 7004 extends the deadline to September 15.
Does a disaster in my area change my deadline?
It can. The IRS routinely postpones filing and payment deadlines for taxpayers in federally declared disaster areas, sometimes by several months. Relief is announced per disaster and per location, so check the IRS disaster-relief page for your county before assuming the standard date applies.
Sources
Sources:
- Internal Revenue Service, Topic No. 301: When, How, and Where to File: irs.gov/taxtopics/tc301
- Internal Revenue Service, filing and payment deadline guidance for the current tax season: irs.gov/filing
Preparing your return? Start with your AGI calculator to find your adjusted gross income, see what your paycheck looks like after tax with the hourly after taxes calculator, and check how adjustments change your taxable income with the adjusted income calculator.