EFIN
An EFIN (Electronic Filing Identification Number) is the number the IRS assigns to a firm it accepts as an Authorized IRS e-file Provider.
Updated · Sources
A firm applies for an EFIN by filing an IRS e-file application. It must meet the IRS’s eligibility rules and pass a suitability check, a review of the firm and its principals. Its principals and responsible officials must also be fingerprinted, unless they prove a professional status. That status covers attorneys, CPAs, enrolled agents, officers of public companies, and bank officials bonded and fingerprinted in the last two years. Approval can take up to 45 days.
A firm that e-files its clients’ returns acts as an electronic return originator (ERO). An ERO starts the electronic filing of returns it prepared, or collected from a taxpayer or another ERO. The IRS also accepts other roles, including transmitter and software developer. A firm needs a separate EFIN for each fixed location where it starts e-filing returns.
Paid preparers must generally e-file individual returns, through an authorized provider. A preparer is exempt only if they reasonably expect to file 10 or fewer such returns in the year. For a preparer in a firm, the firm’s returns are counted together. A preparer without an EFIN can have an ERO e-file their returns. The ERO then attests that the preparer signed the return and that the electronic data matches it.
An EFIN belongs to the firm that received it. The IRS bars sharing, renting, leasing or selling one, and a firm that shares its EFIN can face sanctions. A buyer of a business must get its own. An EFIN is also separate from a PTIN, the number each individual paid preparer needs.
Sources
- IRS, Publication 3112 (Rev. November 2025), IRS e-file Application and Participation
- IRS, Become an authorized e-file provider
- IRS, Publication 1345 (Rev. December 2025), Handbook for Authorized IRS e-file Providers of Individual Income Tax Returns
- 26 U.S.C. § 6011, General requirement of return, statement, or list
- 26 C.F.R. § 301.6011-7, Specified tax return preparers required to file individual income tax returns using magnetic media
Reviewed and updated September 2026. General information, not advice for your situation.