EFIN Protection: Guard Your E-File Number
Your EFIN is one of your most valuable business assets. Criminals who steal it can file thousands of fraudulent returns in your name.
By the Numbers
What EFIN Protection Guide Covers
Credential Security
Secure your EFIN, PTIN, and e-Services login with strong passwords and MFA.
Filing Activity Monitoring
Monitor your EFIN for unauthorized filing activity throughout the year.
Application Security
Secure the IRS e-Services application and restrict access to authorized personnel only.
Employee Access Controls
Limit who can access filing credentials and maintain an access log.
Renewal Security
Protect the annual EFIN renewal process from social engineering attacks.
Theft Response Plan
Know exactly what to do if your EFIN is compromised or used fraudulently.
How to Get Started
Audit Current Access
Identify everyone who has access to your EFIN and e-Services credentials.
Implement MFA
Enable multi-factor authentication on all IRS e-Services and tax software accounts.
Monitor Filing Activity
Regularly review your filing statistics for unexpected spikes or unusual patterns.
Secure & Document
Store credentials securely, document access policies, and train staff on EFIN security.
Your EFIN is Your Business Lifeline
Losing your EFIN to theft can shut down your practice. Our security plan covers EFIN protection protocols.
Frequently Asked Questions
An Electronic Filing Identification Number (EFIN) is assigned by the IRS to authorized e-file providers. Criminals can use stolen EFINs to submit fraudulent returns and steal refunds, making it extremely valuable on the dark web.
Through phishing emails impersonating the IRS, malware on tax preparation computers, social engineering of firm employees, and compromised e-Services login credentials.
Watch for unexpected rejection of returns, IRS notices about returns you did not file, unusual changes to your e-Services account, or communications from the IRS about suspicious filing activity under your EFIN.
Immediately contact the IRS e-Help desk, file a complaint with the Treasury Inspector General, report to local law enforcement, change all credentials, and notify your professional liability insurance carrier.
Protect your tax practice from cyber threats
Schedule a free consultation to assess your firm's security posture.