Is it too late to claim refund for 2021 tax returns?

[lnk-fr]

I paid but haven't filed yet though for 2021...

[BillM223]

Did the comments above answer your questions?

Yes, you have until April 15th to file your 2021 return, unless you actually filed an extension (Form 4868) for your 2021 return in which case, you have until October 15, 2025 to file your 2021 return.

HOWEVER, as noted above, if you are not expecting a refund, then you don't really have a due date, but you are motivated to file in order to stop the amount of interest that you will owe the IRS. The longer you don't file, the more interest you will owe.

File your return as soon as you can, and if the IRS determines that you owe interest, then they will send you a bill for it.

But just get it done, before the IRS really notices that you haven't filed and sends you a grumpy letter.

[lnk-fr]

"Yes, you have until April 15th to file your 2021 return, unless you actually filed an extension (Form 4868) for your 2021 return in which case, you have until October 15, 2025 to file your 2021 return."

What do you mean by "actually filed an extension"? is there any way to get an extension without filing for it?
In my case, I read that submitting an Extension Payment on IRS.gov counts as filing Form 4868,  and it reflects this on my account. 

[KeshaH]

The deadline to file a 2021 return for a refund is today, April 15, 2025.

The due date for filing an original return to claim a refund is three years from the return's original due date. Filing an automatic 6-month extension does not extend the refund expiration date.

The reference to "3 years before you filed the claim plus any extension of time you had to file you return" above is related to the amount of refund you can claim, not the deadline to claim the refund. 

You and the IRS can agree in writing to extend the deadline, but this usually happens if you're being audited for a return you actually filed and the IRS needs more time to complete the audit.