Generally considered outdated or discontinued for federal purposes; the last official paper revision was in July 2003.
Historically used to obtain an Electronic Filing Identification Number (EFIN) and ETIN. Download Free 8633 pdf
While the form is no longer accepted for new applications, you can still download archived versions for informational purposes or record-keeping: Download Form 8633 (Archive) from IRS.gov. Accessible Form 8633 version from IRS.gov. Accessible Form 8633 version from IRS
Some states may have used similar numbering for their own forms (e.g., Illinois previously used Form IL-8633-B, which has also been discontinued in favor of an online portal). Where to Find the PDF for Reference All applications to become an authorized e-file provider
However, as of , the IRS no longer accepts paper Form 8633. All applications to become an authorized e-file provider must now be submitted online through the IRS e-file Application. Key Information About Form 8633
IRS Form 8633, the , was previously used by businesses and tax professionals to apply for authorization as electronic filers.