Tax deadlines look intimidating from a distance, but for most non-resident founders there are really only two dates to keep in view each year, plus an easy extension if either one gets tight. Here’s the full 2026 picture, broken down by entity type, so you can plan ahead instead of scrambling.
The two dates that matter most
Which deadline applies to you depends on how your company is taxed, not on where you live:
- March 16, 2026 (March 15 falls on a Sunday, so the deadline shifts to the next business day) — multi-member LLCs taxed as partnerships, filing Form 1065 and issuing K-1s to each member.
- April 15, 2026 — C-Corporations filing Form 1120, and foreign-owned single-member LLCs filing their pro-forma Form 1120 with Form 5472 attached.
Not sure which one is you? As a rule of thumb: one owner, no elections made → April 15. Two or more owners, taxed as a partnership → March 16. We confirm your entity’s filing category as part of onboarding, so you’re never guessing.
If you need more time: extensions
Every one of these deadlines has a matching extension, and requesting one is routine — it doesn’t raise any flags and it doesn’t cost you anything beyond the time it buys.
- Form 7004 is the extension request for both 1065 and 1120 filers, and it’s due on the original filing date (March 16 or April 15).
- A multi-member LLC (Form 1065) extension moves the deadline to September 15, 2026.
- A C-Corp or foreign-owned single-member LLC (Form 1120 / 5472) extension moves the deadline to October 15, 2026.
An extension moves your filing deadline — it’s a routine paperwork step, not a sign anything is wrong, and it’s one we can request for you whenever the timeline runs tight.
State-side dates worth knowing
Federal filings aren’t the only date on the calendar. If you formed in Wyoming or Delaware, keep these in mind too:
- Wyoming annual report — due on the first day of your company’s anniversary month each year (so it’s different for every company, based on when you formed). The fee is roughly $62.
- Delaware LLC franchise tax — a flat fee (around $300) due June 1, 2026, with no annual report required.
- Delaware corporation franchise tax + annual report — due March 1, 2026, calculated from either authorized shares or assumed par value.
These state dates run on their own schedule, separate from your federal filing. We track both for you, so nothing depends on you remembering two different calendars.
What we handle for you, and when
Here’s roughly how our year runs alongside yours:
- Weeks before your deadline — we reach out for the year’s transaction details (contributions, distributions, loans, income) so nothing is rushed at the last minute.
- A CPA reviews every return before it’s filed, whether it’s a 1065, 1120, or pro-forma 1120 with 5472 attached.
- We file on time, or file the extension for you if you need more runway — either way, you’re covered by the deadline that actually applies to your entity.
- You get a copy of everything filed, so you always have your own record alongside ours.
A quick founder checklist
- Know your entity type (single-member LLC, multi-member LLC, or C-Corp) — it decides your date.
- Mark March 16 or April 15, 2026 on your calendar, whichever applies to you.
- Send us your year’s transaction summary as soon as it’s ready — earlier is easier for everyone.
- If your state formation includes an annual report or franchise tax, note that date separately (it doesn’t follow the federal calendar).
- If a deadline is going to be close, ask about an extension well before the date — there’s no downside to requesting one early.
None of this needs to live in your head. It’s built into every one of our federal tax plans: we track your specific deadline, prepare your return, get it reviewed by a US-licensed CPA, and file it — or file your extension — on time, every year.
