Extension

You can file your taxes and they won't be rejected just because you didn't file an extension.

 

If you have a balance due you will be subject to penalties and interest on the balance due.

 

Here are a few links with more details

 

https://ttlc.intuit.com/community/file-with-turbotax/discussion/extension/01/3390239#M33968

 

https://turbotax.intuit.com/tax-tips/tax-extensions/filing-an-income-tax-extension/L5GIzgJaS

 

https://turbotax.intuit.com/tax-tips/irs-letters-and-notices/guide-to-irs-tax-penalties-how-to-avoid-or-reduce-them/L7Unetw5B#GoTo-Common-tax-penalties