The IRS normally sends correspondence in the mail. They mail millions of letters to taxpayers every year. Keep these important points in mind if you get a letter or notice:
If you don’t agree, it’s important that you respond. Follow the instructions on the notice for the best way to respond to us. You may be able to call us to resolve the issue. Have a copy of your tax return and the notice with you when you call. If you choose to write to us, be sure to include information and any documents you want us to consider. Also, write your taxpayer identification number (Social Security number, employer identification number or individual taxpayer identification number) on each page of the letter you send. Mail your reply to the address shown on the notice. Allow at least 30 days for a response.