Information For...

For you and your family
Standard mileage and other information

Forms and Instructions

Individual Tax Return
Instructions for Form 1040
Request for Taxpayer Identification Number (TIN) and Certification
Request for Transcript of Tax Return


Employee's Withholding Allowance Certificate
Employer's Quarterly Federal Tax Return
Employers engaged in a trade or business who pay compensation
Installment Agreement Request

Popular For Tax Pros

Amend/Fix Return
Apply for Power of Attorney
Apply for an ITIN
Rules Governing Practice before IRS

Understanding your LT18 Notice

We have not received a response from you to our previous requests for overdue tax returns.

What you need to do

  • Mail your return to the address on the letter within 10 days from the date on the letter.
  • If you’ve already filed, call the telephone number listed on the letter.
  • If you’re not required to file, call the telephone number listed on the letter.

You may want to

Call us for assistance at the toll-free telephone number listed in the top right corner of your letter.

Answers to common questions

What if I already filed the return? If it’s been over 10 weeks since you mailed it, send a signed copy of it to us again.

What if I had no employees during the tax period shown on the letter? Please contact us with that information.

Printable samples of this notice (PDF)

How to get help