After you file

do you have an online account with the IRS. if real, the IRS noticed some suspicious activity with regard to the account. if not, the notice may be fake.

if real, you got this notice because your personal information was used to access an IRS online service.

What you need to do
If you accessed this service: you don't need to do anything.
If you did not access this service: immediately call the number on your notice

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Comparing Real and Fake IRS Communications
It’s essential to understand the differences between legitimate IRS correspondence and scam attempts. Here are some key points to help you recognize genuine IRS communications:

Reason for contact: A genuine IRS letter will provide a clear reason for contacting you.
Timeline: Legitimate IRS notices provide a timeframe for responding, usually around 30 days, and outline the steps you need to take to address the issue.
If you’re unsure whether a letter or other correspondence is genuinely from the IRS, you can call the designated IRS hotline at 800-829-1040 to verify the communication’s authenticity.