Your Tax Deadline Moved to November 2. Don’t Use All of It.
If you have been operating on the assumption that your extended business return is due September 15, check your county first. Following the severe storms, tornadoes, and flooding that began April 13, 2026, the IRS postponed most federal filing and payment deadlines for affected Wisconsin taxpayers to November 2, 2026 under FEMA disaster declaration 4923-DR.
That covers our entire service area. It also means four deadlines that normally arrive in an orderly sequence now land on the same day — three weeks before Thanksgiving, with the year almost gone.
First, Does This Apply to You?
Twenty-one counties and the Oneida Indian Reservation qualify, including every county we work in most: Racine, Kenosha, Milwaukee, Waukesha, and Washington. The full list also covers Bayfield, Brown, Buffalo, Iowa, Jackson, Jefferson, Juneau, Kewaunee, Manitowoc, Marathon, Outagamie, Rock, Sauk, Vernon, Waupaca, and Winnebago.
Relief is automatic. The IRS applies it based on the address of record on your return, so if you live or run your business in one of those counties, there is nothing to file to claim it — our Racine and Kenosha clients are covered by default.
Three situations need a phone call instead of an assumption. If you moved into the area recently and the IRS still has your old address, if you live or operate outside the area but your books and records are inside it, or if you are a relief worker affiliated with a recognized organization, you may qualify but the system will not know it. The IRS disaster hotline is 866-562-5227. If a notice arrives because the relief was never applied to your account, that is exactly what IRS representation and audit defense is for.
What Actually Moved
The governing rule is straightforward: any federal deadline falling on or after April 13, 2026 and before November 2, 2026 is postponed to November 2.
| Filing or payment | Normally due | Now due |
|---|---|---|
| 2025 partnership & S-corp returns (extended) | Sep 15, 2026 | Nov 2, 2026 |
| Q3 2026 estimated tax payment | Sep 15, 2026 | Nov 2, 2026 |
| 2025 individual returns (extended) | Oct 15, 2026 | Nov 2, 2026 |
| 2025 C-corp returns (extended, calendar year) | Oct 15, 2026 | Nov 2, 2026 |
| Q3 2026 payroll tax returns (Form 941) | Oct 31, 2026 | Nov 2, 2026 |
| Q1 & Q2 2026 estimated tax payments | Apr 15 / Jun 15 | Nov 2, 2026 |
If you never filed or extended your 2025 individual return at all, that one moved too. Our tax due dates page carries the standard calendar; this year, for these counties, read it with November 2 in mind.
Not Sure Which Deadlines Are Yours?
Yes — Wisconsin Follows, and Without Interest
This is the question we have been asked most this month, and the answer is good news. Wisconsin does not make you chase a separate extension. Department of Revenue guidance is explicit: “Any extension granted by federal law or by the Internal Revenue Service extends the date for filing the corresponding Wisconsin return.” Your Wisconsin return rides along to November 2.
Better still, the usual cost of an extension disappears. Wisconsin normally charges 1% per month — 12% a year — on tax still owed during an extension period. Under Wis. Stat. § 71.03(7)(f), taxpayers who qualify for a federal extension because of a presidentially declared disaster are not charged that interest.
There is one thing you must do to get it. Enter “03” in the Special Conditions box on the front of the Wisconsin return, and write the name of the federally declared disaster on the line provided. Miss that box and you invite a state notice on a return that was actually filed on time. It belongs on the checklist for every affected return we prepare this fall — see our tax preparation services for how we handle it.
The Part Nobody Is Talking About
Every article you will read about this relief describes it as breathing room. It is — but only if you understand what got stacked up behind the new date.
Three quarters of estimated tax now land on one day. Q1, Q2, and Q3 2026 estimates all fell inside the postponement window. If you deferred them on the strength of the relief, November 2 is a single payment covering nine months of income. Then Q4 arrives January 15, 2027 — ten weeks later. That is two substantial payments inside one quarter, and the cash has to be there for both.
Your K-1 and your 1040 are now due the same day. In a normal year the partnership or S-corp return lands September 15, which gives you a month to build the individual return around the K-1 it produces. Both dates are now November 2, and there is no gap left between them. Wait until late October and you are closing a business return and the individual return that depends on it in the same week.
It quietly eats your year-end planning window. The decisions that actually change a tax bill — retirement plan setup, equipment timing, distribution and reasonable-compensation levels, Roth conversions, entity elections — have to be made while there is still year left to work with. If your compliance work runs to November 2, you start planning in November with seven weeks on the clock and a holiday in the middle of them.
What the Postponement Does Not Cover
One important thing did not move, and it is the one the IRS is least forgiving about.
Deposit relief was far narrower than the filing relief, and it expired months ago. Penalties were abated only on payroll and excise tax deposits due on or after April 13 and before April 28, 2026, and only if the deposit was actually made by April 28. Your ongoing payroll tax deposits are not postponed and never were. Do not let “everything moved to November” turn into a payroll deposit problem.
The Casualty Loss Election Worth Running Both Ways
If you took storm damage that insurance did not cover, you have a genuine election worth money. A disaster-related casualty loss can be claimed on your 2026 return or, by election, on your 2025 return — whichever year the deduction is worth more against your actual income and brackets. Those two answers are frequently not close.
If you claim it, write 4923-DR on the return. And run the comparison before you choose; this is not an election to make by default, and it is one of the few places this storm season can work in your favor.
What to Do in September
- Confirm your county qualifies, and that the address the IRS has on file actually puts you inside it.
- Total your Q1–Q3 2026 estimates and set the cash aside for a single November 2 payment.
- Get your bookkeeping closed through August now — not in the last week of October.
- Contractors and manufacturers: bring WIP and job costing current. The same numbers that drive your extended return drive every year-end decision that follows it.
- Farm operations should pair this with normal harvest-season planning rather than treating it as a separate exercise.
- If you had uninsured storm damage, ask us to price the loss in both 2025 and 2026 before the return is finalized.
- Remember the Wisconsin Special Conditions code “03” on the state return.
- Put year-end planning on the calendar for October, while there is still a year to plan.
File Before November 2 — Not On It.
The clients who come out of this well will treat November 2 as a backstop rather than a target: returns wrapped in October, estimates funded, and a planning conversation happening while there is still time to act on it. The clients who treat it as six extra weeks will spend the last week of October doing three months of work, then walk into December with no moves left.
If you are not sure which deadlines are yours, or you want the casualty loss election run both ways, that is a short conversation and it is better had now.
