If your address of record sits in a federally declared disaster area with an open IRS postponement, the September 15 estimated tax installment is not due on September 15. In Indiana it is due February 1, 2027 (IRS, IN-2026-01). In the covered Michigan counties it is due November 2, 2026 (IRS, MI-2026-02).
You do not apply for this. The IRS applies it to you.
Tax Disclaimer: This article summarises published IRS disaster relief announcements and is not tax advice. Confirm your own county against the IRS announcement for your area before relying on a postponed date.
The rule that decides whether it reaches you
Every announcement carries a disaster start date, and that date is the hinge. The IRS wording is the same in each one. In Michigan: “Estimated income tax payments originally due on or after April 10, 2026, are postponed through Nov. 2, 2026, and affected taxpayers will not be subject to penalties for failure to pay estimated tax installments as long as such payments are paid on or before Nov. 2, 2026” (IRS, MI-2026-02).
In Indiana the same sentence runs from August 11, 2026 through February 1, 2027 (IRS, IN-2026-01).
So there are two questions, in this order. Did the disaster start on or before September 15, 2026? And is the postponed deadline after September 15, 2026? Two yeses and your Q3 installment has moved.
Areas with a postponed deadline still ahead of September 15
These are the open 2026 announcements whose new deadline falls after the Q3 date, taken from the IRS master list (IRS, Tax relief in disaster situations).
| Area | New deadline | Announcement |
|---|---|---|
| Indiana (21 counties) | Feb 1, 2027 | IN-2026-01 |
| Washington | Feb 1, 2027 | WA-2026-03 |
| Douglas County, Washington | Feb 1, 2027 | WA-2026-02 |
| Nebraska (five separate declarations) | Feb 1, 2027 | NE-2026-03 to NE-2026-07 |
| West Virginia | Feb 1, 2027 | WV-2026-01 |
| Mississippi (Tropical Storm Arthur) | Feb 1, 2027 | MS-2026-03 |
| Northern Mariana Islands (Super Typhoon Bavi) | Feb 1, 2027 | NMI-2026-02 |
| Mississippi (severe storms) | Nov 2, 2026 | MS-2026-02 |
| Michigan (37 counties) | Nov 2, 2026 | MI-2026-02 |
| Wisconsin | Nov 2, 2026 | WI-2026-02 |
| Northern Mariana Islands (Super Typhoon Sinlaku) | Nov 2, 2026 | NMI-2026-01 |
| Crow Tribe, Montana | Sep 28, 2026 | MT-2026-04 |
| Fort Peck Tribes, Montana | Sep 28, 2026 | MT-2026-03 |
| San Carlos Apache Tribe, Arizona | Sep 28, 2026 | AZ-2026-01 |
| Louisiana (Tropical Storm Arthur) | see announcement | LA-2026-02 |
Most of these are county lists rather than whole states. Michigan’s covers 37 named counties and Indiana’s covers 21, so a state appearing in that table is not the same as your county appearing in it. Open your area’s announcement and read the county list before you change what you were going to do on Tuesday.
What “automatic” actually means
“The IRS automatically identifies taxpayers located in the covered disaster area and applies filing and payment relief” (IRS, IN-2026-01). It runs off the address of record on your last return. No form, no election, no phone call.
That cuts both ways. If you moved into a covered county this year and the IRS still has your old address, the system does not know. And if you live outside the area but your business records or your preparer are inside it, the relief is available and it is not automatic: “affected taxpayers who reside or have a business located outside the covered disaster area should call the IRS Special Services toll-free number at 866-562-5227 to request this tax relief” (IRS, IN-2026-01).
If a penalty notice arrives anyway for a period the postponement covers, that is a phone call to the number on the notice, not a payment.
Postponed is not forgiven, and the money question stays open
The announcements postpone the date and waive the failure-to-pay-estimated-tax penalty. They do not reduce the tax.
Which turns the decision into cash flow. Holding the money until February 1 is free of penalty, and it is the right answer if the disaster cost you real money and you need the liquidity. It is not automatically the right answer otherwise: a postponed Q3 and a postponed Q4 land on the same February date as your 2026 return, and three payments arriving at once is how people end up on a payment plan in the spring. If that is where this is heading, the installment agreement mechanics are worth reading before you get there rather than after.
If you do choose to pay on the original schedule, nothing about the relief stops you. Work out the number first, because a postponement is not a reason to guess at it: two routes get you there, and the faster one reads a single line off your 2025 return. The 1099 tax estimator runs the same chain on your own figures, and the safe harbor penalty calculator prices what a genuinely late installment would have cost had the postponement not applied.
Your state has its own answer
Federal postponement does not move a state deadline. Some states conform automatically to federal disaster relief, some announce their own, and some do neither.
That matters more than usual this quarter, because several states want a third instalment on September 15 at thresholds well below the federal one, and one large state wants nothing at all. We laid that out in the state estimated-tax deadline piece. Check your state revenue department directly for disaster conformity; it is not safe to assume.
The bottom line
Three checks, in order, and each one can end the exercise:
- Is your county in an open announcement on the IRS disaster relief list?
- Did that disaster begin on or before September 15, 2026?
- Is the postponed deadline after September 15, 2026?
Three yeses and Tuesday is not your deadline, and no penalty accrues as long as you pay by the postponed date. Anything less than three and September 15 stands exactly as it did, along with everything that decides whether you owe a payment at all.
One more thing worth doing even if the relief does reach you. Confirm your address of record is current, because that single field is what the automatic relief runs on, and it is also what decides whether the notice about it ever arrives.
