This guide covers returns filed in 2026 for tax year 2025. It explains the standard dates, extension and payment rules, the 2026 Michigan disaster postponement, city tax differences, and what to do if you miss a deadline. Confirm every date against current IRS and Michigan Department of Treasury guidance before you act.
Key Takeaways
- Federal Form 1040 and Michigan MI-1040 are due April 15, 2026; the ordinary extension ends October 15, 2026.
- An extension to file is not an extension to pay. Estimate and pay your balance by April 15.
- IRS disaster relief extends deadlines to November 2, 2026 only for qualifying taxpayers, counties, and obligations.
- Michigan's own relief is request-based, and city returns follow separate calendars.
Michigan Tax Deadlines 2026 at a Glance
The tax year is 2025, the year your income was earned. The filing year is 2026, when you report it. So "2026 deadlines" means returns for 2025 income.
| Return | Filing due | Extended filing | Payment due |
|---|---|---|---|
| Federal Form 1040 (IRS) | April 15, 2026 | October 15, 2026 | April 15, 2026 |
| Michigan MI-1040 (Treasury) | April 15, 2026 | October 15, 2026 | April 15, 2026 |
| Eligible federal disaster obligations | On or after April 10 and before Nov. 2 | November 2, 2026 | Also postponed |
When a deadline lands on a weekend or legal holiday, it moves to the next business day. Check the effective date each year instead of trusting a recurring calendar date. For 2026, the IRS lists April 15 as the filing deadline even though D.C. Emancipation Day falls on April 16.
Status note: If you're reading this after April 15, the standard deadline has passed. Your options are the ordinary October 15 extension (if you requested one on time), the November 2 federal postponement (if you qualify), or filing late as soon as possible. The IRS filing dates page, the MI-1040 instructions, and Treasury's website show the current status.
Federal Form 1040 Filing Deadline for 2026
The federal filing and payment deadline for most calendar-year filers was April 15, 2026. It applies to anyone filing Form 1040 and its schedules.
Filing and Payment
- E-file through tax software or IRS Free File, or mail a paper return.
- Attach every required schedule and supporting form.
- Pay by Direct Pay, card, or check.
- Keep your e-file confirmation or proof of mailing.
Federal Extension
Submit Form 4868 by April 15, including through IRS Free File. That moves your filing date to October 15, 2026. An electronic payment designated as an extension payment, such as through IRS Direct Pay, also works without a separate form.
The extension gives you more time to file, not more time to pay. Interest and penalties run on any unpaid balance from April 15.
2026 Michigan Disaster Postponement
In release MI-2026-02 (July 13, 2026), the IRS postponed deadlines for taxpayers affected by severe storms, tornadoes, and flooding that began April 10. FEMA lists the incident period as April 10-21, 2026 (disaster DR-4925-MI).
The IRS Michigan relief announcement sets the new date at November 2, 2026.
Covered counties (37): Alcona, Allegan, Alpena, Antrim, Barry, Benzie, Charlevoix, Cheboygan, Crawford, Eaton, Emmet, Grand Traverse, Gratiot, Iosco, Iron, Kalamazoo, Kalkaska, Lake, Manistee, Marquette, Mecosta, Menominee, Missaukee, Montcalm, Montmorency, Muskegon, Newaygo, Oceana, Ogemaw, Osceola, Oscoda, Presque Isle, Roscommon, Saginaw, Tuscola, Washtenaw, and Wexford.
- Covered obligations: Deadlines on or after April 10 and before November 2, including 2025 individual returns, tax normally due April 15, valid extended filings, and estimated-tax installments in that window.
- Not generally covered: W-2 and 1099 information returns, and employment or excise deposits unless specifically included.
Relief is automatic for residents of covered counties. Taxpayers elsewhere may qualify if the records they need are located in the covered area. Don't assume every Michigan taxpayer gets relief, and confirm eligibility with the IRS.
Michigan MI-1040 Filing Deadline for 2026
The standard MI-1040 due date is also April 15, 2026.
Who Files
- Full-year residents: file if you must file federally, even with no Michigan tax due. Otherwise file when your income exceeds your Michigan exemption allowances.
- Part-year residents: Michigan taxes income earned, received, or accrued while you lived there. Complete Schedule NR.
- Nonresidents: Michigan-source wages, rents, and business income can be taxable. Reciprocal agreements may create exceptions.
Your federal return supplies much of the income data, but filing Form 1040 doesn't satisfy your Michigan obligation. Nonresidents and part-year residents include the 2025 Schedule NR with the MI-1040.
Michigan Extension
Treasury's current form is Michigan Form 4 (Rev. 03-25). A federal extension automatically extends Michigan filing to the federal extended date. Without one, Treasury generally grants a six-month individual extension.
If you owe tax, pay with Form 4 or a copy of the federal extension. Michigan e-Payments lets you pay without mailing Form 4. If you expect a refund, you don't need an extension.
Balances, Refunds, and Estimates
Payment is still due April 15 regardless of any extension. Withholding credits reduce what you owe. Self-employed filers and others with income outside withholding may need quarterly MI-1040ES payments, generally when expected Michigan tax exceeds $500.
The 2026 MI-1040ES installments fall on April 15, June 15, and September 15, 2026, and January 15, 2027. Federal Form 1040-ES uses the same four dates.
Don't Confuse It With City Returns
Michigan cities impose their own income taxes with separate forms and calendars:
| City | 2026 filing date | Extension |
|---|---|---|
| Detroit | April 15 | Form 5209 by April 15; up to six months |
| Grand Rapids | April 30 | Separate city form and deadline |
| Lansing | April 30 | A federal extension doesn't satisfy the city requirement; tentative tax remains due |
Check deadlines with your city's tax authority.
Extensions, Payments, and Late-Filing Consequences
Federal vs. Michigan Extensions
Michigan accepts a federal extension for state filing purposes, so a timely Form 4868 covers both returns. Without one, file Form 4. City extensions are separate. Keep a copy of your extension confirmation and payment record.
Estimating Your Payment
Review last year's return, your 2025 income, and your withholding. Pay your best estimate of the balance by April 15. Underestimating leaves you exposed to penalties and interest on the shortfall.
| Charge | Rule |
|---|---|
| Federal failure to file | 5% of unpaid tax per month, up to 25% |
| Federal minimum (over 60 days late) | Lesser of $525 or 100% of the tax due |
| Federal failure to pay | 0.5% per month, up to 25%; 0.25% during an approved payment plan |
| Federal interest | 6% annually (April-June 2026), 7% (July-December), compounded daily |
| Michigan late filing/payment | 5% initially, then 5% more per month, up to 25% |
| Michigan interest | 8.48% annually (January-June 2026), 7.85% (July-December) |
The federal failure-to-file charge is reduced by the failure-to-pay charge for the same month, so the usual combined rate is 4.5% plus 0.5%.
If You Missed the Deadline
- File now. Penalties grow every month, and filing stops the failure-to-file charge.
- Pay what you can. Request an IRS payment plan for the rest.
- Review notices. Check penalty and interest calculations.
- Request relief. The IRS offers First Time Abate and reasonable-cause relief. Michigan wants a written reasonable-cause request showing no willful neglect.
- Keep proof. Save filing confirmations and payment receipts.
Eligible taxpayers penalized despite the disaster postponement can call the number on the IRS notice for abatement.
Special Situations Michigan Filers Should Check
Filing requirements can differ even when the deadline is the same:
- Part-year residents and nonresidents with Michigan-source income
- Self-employed taxpayers who owe estimated payments
- People who lived in more than one state during the year
- Taxpayers with investment or business income
Not every obligation moves with the 2026 disaster relief. Amended returns, refund claims, estimated payments, employer withholding, and city returns each follow their own rules.
- Covered: 2025 individual returns, tax normally due April 15, valid extensions, and estimated installments in the window.
- Not covered: information returns, employment deposits, state deadlines, and city returns.
For amended returns, the postponement counts as an extension for refund lookback calculations, but the IRS notice does not name Form 1040-X or 1040-NR. A Form 1040-X refund claim is generally due by the later of three years from filing or two years from payment.
Cross-border filers face another wrinkle. A Form 1040-NR filer with employee wages subject to U.S. withholding had an April 15 deadline. Without such wages, the deadline was June 15, 2026.
NRIs, OCIs, foreign-owned businesses, and other cross-border taxpayers with U.S. filing obligations often need specialized support. VJM Global provides U.S.-compliant tax and accounting help, including Form 1040-NR preparation, Form 8833 treaty-benefit claims, and FATCA compliance.
Frequently Asked Questions
What's the deadline to file taxes in Michigan?
The MI-1040 deadline for 2025 returns was April 15, 2026. Check Treasury's website for any special relief or updates.
Can I get an extension for filing my Michigan state taxes?
Yes. Treasury generally grants six months to file, and Form 4 is the current application. Any tax owed is still due April 15.
Does a federal tax extension automatically extend my Michigan MI-1040 deadline?
Yes. A federal extension extends Michigan filing to the federal extended date automatically. Attach a copy of it when paying, and keep your confirmation.
Is the tax payment deadline the same as the filing deadline?
Normally, yes. Both were April 15, 2026. An extension gives more time to file, not to pay, so interest and penalties accrue on any unpaid balance.
What happens if I miss the Michigan tax filing deadline?
File as soon as possible and pay what you can. Michigan charges penalties of up to 25% plus interest. Request a waiver in writing if you have reasonable cause or qualify for disaster relief.
