In the IRS e-file program, the Electronic Filing Identification Number (EFIN) identifies the tax firm authorized to prepare and originate electronic returns, and the Electronic Transmitter Identification Number (ETIN) identifies the party that actually transmits those returns to IRS systems.1Internal Revenue Service. IRS e-Services IRS e-file Application Process Most preparers only ever deal with the EFIN. The ETIN generally sits with the software company that carries returns to the IRS on the firm’s behalf.
Which Number You Actually Need
The EFIN is the firm’s authorization to participate in e-file. Every electronically filed return carries it, and any compliance issue on those returns traces back to the firm that owns the number.2Internal Revenue Service. FAQs About Electronic Filing Identification Numbers (EFIN) You need one to file client returns electronically. You need a separate EFIN for each physical office location where transmissions happen, and the number cannot be transferred if you sell the practice; the new owners have to apply for their own.3Internal Revenue Service. How to Maintain, Monitor and Protect Your EFIN
The ETIN is a different job. It identifies the technical channel that delivers return data to the IRS. If you file through commercial tax software, the software company holds the ETIN and you don’t need one. You only need your own ETIN if your firm builds or operates its own transmission software and sends returns directly to the IRS. In that setup, the EFIN covers your role as preparer and originator, and the ETIN covers your role as transmitter.
Principals and Responsible Officials
Every e-file application has to identify at least one Principal and at least one Responsible Official, and the IRS holds both personally accountable.4Internal Revenue Service. IRS Publication 3112 – IRS e-file Application and Participation
A Principal is someone with ownership or legal authority over the business, such as an owner, partner, or corporate officer, and is authorized to act for the business in legal and tax matters. A Responsible Official runs day-to-day e-file operations at a specific office location and is on the hook for program compliance there. In smaller firms one person often fills both roles.
Both must clear the IRS suitability check on their personal tax history. Outstanding tax debts and unfiled returns are common reasons applications get denied. If a Principal or Responsible Official later falls out of compliance, the IRS can revoke the firm’s e-file privileges entirely.
How to Apply
The application lives on the IRS e-Services portal and requires an ID.me account for identity verification. You’ll need a Social Security number or ITIN and a valid government-issued photo ID such as a driver’s license, state ID, or passport.5Internal Revenue Service. Creating an Account for IRS.gov Once you’re verified, the e-file application opens inside the portal.
The application asks for the firm’s legal name, Employer Identification Number, business structure, and office address. Everything has to match what other federal agencies already have on file for you. Small discrepancies can trigger a rejection before the suitability review even starts.
Applicants who aren’t already licensed professionals must complete fingerprinting through an IRS-authorized vendor, at no charge; the scheduling link appears on the application summary page after submission.6Internal Revenue Service. Become Authorized as an IRS E-file Provider in Just a Few Simple Steps CPAs, attorneys, and enrolled agents may be exempt if they provide proof of current credentials. The application also asks about past professional misconduct or legal issues involving firm leadership. Concealing something the background check will surface anyway is one of the fastest routes to a permanent bar from the program.
After submission, the IRS runs a suitability check that looks at credit, tax compliance, criminal background, and any prior e-file compliance history.7Internal Revenue Service. Tax Pros: Apply to Be an IRS Authorized E-file Provider in a Few Simple Steps Approval can take up to 45 days. You can track progress in the e-file Application Summary tool inside e-Services, and the IRS will send a formal letter if it needs more information or finds a problem. Plan the application well before filing season so there’s room to fix anything that comes up.
If the Application Is Denied
You have 30 calendar days from the date of a denial letter to submit a written response requesting administrative review to the IRS office named in the letter.8Internal Revenue Service. IRS Internal Revenue Manual 8.7.13 – E-file Cases The IRS will either withdraw the denial or sustain it in a second letter. A sustained denial can be appealed to the IRS Office of Appeals, again within 30 days, with detailed reasons and supporting documentation. Miss either deadline and the right to review or appeal on that application is gone.
Keeping the EFIN Active and Protected
Getting approved is only the start. The IRS expects the e-file application to stay current, and you have to update it within 30 days of any change: new or departing principals, a new address, a new phone number, or a new office location.3Internal Revenue Service. How to Maintain, Monitor and Protect Your EFIN Skipping updates can lead the IRS to inactivate your EFIN without warning.
EFIN theft is a real risk. Criminals who steal one can file fraudulent returns under your firm’s credentials and leave you to clean up. If you suspect your EFIN has been compromised, report it to your local IRS Stakeholder Liaison right away. The toll-free line cannot accept third-party reports of tax-related identity theft.9Internal Revenue Service. Data Theft Information for Tax Professionals The Stakeholder Liaison notifies IRS Criminal Investigation and internal teams so fraudulent returns can be blocked.
Sanctions for Non-Compliance
The IRS sorts infractions into three levels.10Internal Revenue Service. IRS Internal Revenue Manual 3.42.10 – Authorized IRS E-file Providers Level one covers minor or self-corrected procedural issues and usually draws a written reprimand. Level two covers violations that hurt return quality or voluntary compliance, or repeated level-one issues that continue after the IRS flags them; the standard penalty is a one-year suspension from e-file. Level three covers fraud, association with known criminals, monetary crimes, deliberate misrepresentation on an application, or continued level-two behavior after warning. Level three can bring immediate suspension, and expulsion at this level can be permanent with no opportunity to reapply.
A proposed sanction can be answered in writing within 30 days, with supporting documentation explaining why it should be withdrawn.8Internal Revenue Service. IRS Internal Revenue Manual 8.7.13 – E-file Cases If the IRS affirms the sanction, you have another 30 days to appeal to the Office of Appeals. The same rule applies as with application denials: miss the deadline, lose the review.
How the EFIN Fits With the PTIN
The EFIN isn’t the only number a tax professional needs. Anyone who prepares or assists in preparing federal tax returns for compensation must also hold a valid Preparer Tax Identification Number (PTIN). The PTIN identifies the individual preparer; the EFIN identifies the firm. They aren’t interchangeable. A sole practitioner needs both: a PTIN for personal preparer identification and an EFIN for the firm’s e-file authorization.
Losing one doesn’t automatically take the other with it. A firm can have its EFIN revoked while individual preparers keep their PTINs, though the reputational fallout usually follows both. Keeping every credential current and in good standing is the simplest way to avoid disruption during filing season.