Need more time to file your taxes? Understanding the tax extension rules 2026 is critical if you want to avoid penalties and interest.
You’re not alone—and filing a tax extension can be a smart move.
But here’s what most business owners get wrong…
👉 A tax extension gives you more time to file—not more time to pay.
What a Tax Extension Actually Does
A tax extension allows you to delay filing your return (typically until October).
However:
- Your payment is still due April 15
- The IRS expects you to estimate what you owe
- You should send payment with your extension
The Biggest Mistake Business Owners Make
Many people assume:
“I’ll just file an extension and pay later.”
That mistake can cost you.
👉 If you don’t pay enough by April 15:
- You may face late payment penalties
- You’ll likely incur interest on the unpaid balance
How Much Should You Pay With an Extension?
The best-case scenario:
👉 Pay 100% of what you expect to owe
If you can’t:
👉 Aim to pay at least 90% of your total tax liability
This can help reduce or avoid certain penalties (though interest may still apply).
Why Filing an Extension Is Still a Smart Move
Extensions are not a bad thing—in fact, they’re often the better option.
Filing an extension can help you:
- Avoid rushing and making mistakes
- Wait for missing documents (K-1s, 1099s, etc.)
- File a more accurate return
- Work with a tax advisor on strategy
👉 Accuracy is almost always better than speed.
Watch the Full Breakdown
I explain this in a quick video here:
👉 https://youtube.com/shorts/m8uHj94Dg54?si=C-MhT_igy5KfJTSN
Don’t Overpay (or Underpay) Your Taxes
If you’re unsure how much to send with your extension, don’t guess.
👉 Take my Financial Literacy Quiz:
https://go.gundersonsbookkeeping.com/financialliteracyquiz
Or book a Discovery Call and we’ll help you estimate it correctly.
Final Thoughts
A tax extension is a tool—not a delay tactic.
Use it wisely:
- File later ✔️
- Pay on time ✔️
That’s how you avoid unnecessary penalties and keep more of your money.