I filed my federal tax return and PA state return but forgot to add form 1099-NT. So what I can do now

I think you mean you didn't file a 1099-INT.

 

If so, wait for the IRS to process the full return.

You may get a tax notice requesting the information.

• You can then call and resolve it

If the return is completely processed you should file an amended tax return

• How do I amend my federal tax return for a prior year?

Thanks for the reply