Most founders only know about April 15, but there’s more to startup taxes than just 1120

If you’re a Delaware C-Corp, you’ve probably heard about Form 1120 due on April 15.

But that’s just one piece of the puzzle. A lot of founders breathe easy after filing a tax extension in April.

But the IRS doesn’t forget 😅

If you’re a Delaware C-Corp and filed Form 7004, your corporate tax return is still due:

🗓️ October 15, 2025 - Final deadline for extended 1120

Plus, more deadlines are coming up.

We built TaxHero 2.o to make all of this less painful. Answer a few questions and get a tax calendar for your startup in 10 seconds.

Try it free: taxhero.vc

Curious, what tax or finance task do you always end up Googling at the last minute?