Oct 15

DEADLINE:

Thursday, October 15, 2026 — the last day to file your 2025 return if you're on an extension.

October 15 is the final deadline if you filed an extension

If you requested an extension for your 2025 return, you can't request a second postponement.

Here's exactly what it means for individuals (1040), sole proprietors, and single-member LLCs, and how to get there on time without the scramble.

April came and went, but for many business owners, tax season didn't end there.

If you filed Form 4868 and requested an extension, you only moved your filing deadline to October 15, 2026.

That's the last day to submit your 2025 return, and there is no third

chance.

The good news: there's still time to do it right.

The bad news: every week that passes without your numbers in order makes that Thursday land with more pressure. Below is exactly what this date means, who it applies to, and what you need ready.

0 1 — W H O I T A P P L I E S T O

Is this date for you?

The October 15 deadline applies to anyone who filed a valid extension before April 15, 2026. In practice, that's three groups that file the same way:

• Individuals (Form 1040)

Anyone who requested an extension with Form 4868 has until October 15 to submit their completed 1040.

• Sole proprietors

Your business is reported on Schedule C, which lives inside your personal return. That's why your deadline is the same as the 1040.

• Single-member LLCs

To the IRS, a one-owner LLC is a "disregarded entity": its income and expenses also flow to the Schedule C on your 1040.

If your business is a partnership or an S-Corporation, your calendar is different: those extended returns were already due on September 15, 2026. Calendar-year C-Corporations share the October 15 date. When you're not sure which entity type you are, that's exactly the

kind of thing worth reviewing with us before the clock runs down.

02 — THE COSTLIEST MISCONCEPTION

No tax due doesn't mean no penalty

Most business owners assume that because an S-Corp or Partnership doesn't pay federal income tax at the entity level, a late return is harmless. With individual taxes, the penalty is a percentage of what you owe, so zero owed often means zero penalty. The IRS treats these returns differently.

IMPORTANT

Form 1120-S and Form 1065 are information returns. The late-filing penalty is charged per owner, per month, and it applies even if the business had no income, ran at a loss, or owes no tax at all.

So the deadline isn't really about a payment, it's about handing the IRS the data on time and getting K-1s into your owners' hands. That's why a return with a $0 tax bill can still generate a four-figure penalty.

03 — IF YOU MISS THE DATE

What filing late costs

The failure-to-file penalty runs under IRC §6698 for partnerships and §6699 for S-Corps.

The math is the same for both, and it multiplies by the number of owners:

ITEM: APPROXIMATE COST:

Failure-to-file penalty 5% per month · max 25%

(for not filing)

Failure-to-pay penalty 0.5% per month

(for not paying)

Interest on the balance Daily ~7% annual*

Minimum once you're 60+ days late Around $525

*The IRS sets the interest rate each quarter; in 2026 it has hovered around 7% annually and compounds daily. There is no second extension for individuals.

04 — BEFORE YOU FILE

What to have on hand

Coming in prepared turns a stressful task into a quick one. Here's the base for a 1040 with a Schedule C:

✓ Income forms — W-2, 1099-NEC, and 1099-MISC for the full year.

✓ Business income records — sales, deposits, and invoices collected.

✓ Deductible expenses — receipts and statements sorted by category.

✓ Up-to-date books — ideally with business and personal accounts kept separate.

✓ Last year's return — a useful reference that helps you avoid omissions.

✓ Estimated payment records — what you've already sent the IRS during the year.

The bottleneck is almost never the form itself: it's having the numbers in order. When the bookkeeping is clean, preparing the return is a matter of hours, not weeks.

One advantage of being in Florida: the state has no personal income tax, so most residents don't file an individual state return. Even so, if you earned income in another state, you may still have to file there. Better to confirm it than to assume.

05 — QUICK TIPS

So you don't leave it to the last day

• Don't wait until the 15th. If there's an error or a system rejection, you'll want room to fix it.

• File electronically (e-file) and pay online whenever you can; it's faster and leaves a record.

• Keep your confirmations: the e-file acknowledgment and payment receipt are your proof.

• Review your estimated payments for the year so the final balance doesn't surprise you.

AUREI · BOOKKEEPING & FINANCE

Reach October 15 with your numbers ready

At Aurei we get your bookkeeping in order so filing your return is fast and surprise-free. Direct communication, clear pricing, and a team that actually responds, without the distance of a traditional firm. Let's talk before the deadline tightens.

This article is for informational purposes and reflects general federal rules for the 2025 tax year. It is not tax, accounting, or legal advice for your specific situation. Dates and penalties may vary due to individual circumstances, disaster declarations, or other IRS exceptions. Consult a professional about your particular situation.