What should I do if someone from the IRS "calls" me?

The IRS will not call you or email about anything; they will mail you something first.

According to the Treasury Inspector General, here's what you should do: 

If you get a call from someone claiming to be with the IRS asking for a payment, here’s what to do:

• If you owe Federal taxes, or think you might owe taxes, hang up and call the IRS at 800-829-1040. IRS workers can help you with your payment questions.
• If you don’t owe taxes, fill out the “IRS Impersonation scam” form on TIGTA’s website, www.treasury.gov/tigta or call TIGTA at 800-366-4484.
• You can also file a complaint with the Federal Trade Commission at www.FTC.gov. Add “IRS Telephone Scam" to the comments in your complaint.