Important: To avoid the 5 percent per month underpayment penalty, the amendment must be made on the quarterly return for the period of the under remittance. But be aware, if you end up having to amend your federal return, you will need to amend your PA return.This is the easiest way to electronically fill out the forms and prevent losing any information that you've entered. Services allows you to electronically submit requests for a variety of support services. Services uses a series of questions to complete documents. The PA-65 Corp must be amended if a partnership amends federal Form 1065. DECEDENTS, ESTATES AND FIDUCIARIES. Chapter. 1. The following forms can be printed and submitted to your county DRS. Read the descriptions to determine which forms are appropriate for your needs. Affidavit. Commonwealth of Pennsylvania (or State of ______).