No. You do not have to mail in Form PA-8453. Keep a copy with your records. Pennsylvania says:
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.
See: Instructions for PA-8453.
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