An EFIN is a number assigned by the Internal Revenue Service to preparers that are accepted into the fed/state e-file program. To become an authorized IRS e-file provider, preparers must submit an application and undergo a screening process (this is not the same as your EIN or PTIN). Your tax office must have an EFIN to offer Advent Refund Products.
To learn more, visit http://www.irs.gov/pub/irs-pdf/f8633.pdf
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