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Most likely it was the Form PA-8453, you don't need to mail it in, unless your State requests it. You should keep it with a copy of your tax return.
Do not mail Form PA-8453 and attachments to the PA Department of Revenue unless requested. 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
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