If you file from a home computer - but -it may not need to be mailed in. PA 8453 states on page 3 of the directions, that under certain conditions, you are supposed to print the form, sign it, and keep it with your tax records. Please see PA-8453- PA Department of Revenue which states:
Any taxpayer filing electronically from a home computer must keep the signed Form PA-8453 and supporting documents for three years after the due date of the return or the date the return was filed electronically, which-ever is later. Taxpayers must make the documents available to the PA Department of Revenue upon request. Do not mail Form PA-8453 and attachments to the PA Department of Revenue unless requested.
So, the correct answer is you need it but probably don't actually need to mail it. See the rest of the instructions in case you are the odd case that needs to mail it.
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