Historically used to obtain an Electronic Filing Identification Number (EFIN) and ETIN.
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 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. Download Free 8633 pdf