Waiting on my W-2C. Can I file with my existing W-2?

[mvillain]

Situation

-my current W-2 has only one thing wrong with it. My employer put my 401K contributions as traditional, even though I double checked with my 401K that everything is going into Roth.

Question

Can I file with my current W-2?  or do I have to file for an extension, cause my employer said that it might take longer than April 15th for the W-2C to arrive. 

Cause I have looked up online that the extension, only extends the filing but not the payment. But how will I know how much I owe?

[DoninGA]

Your contributions to the employer sponsored retirement plan, either 401(k) or Roth 401(k), are not entered on a tax return.  The contributions are only reported on the W-2.  You do not need to amend your 2024 tax return.

[mvillain]

Even though on block 12a it reflects as code D instead of code AA?