IRS LT26 Notice: File Your Missing Tax Returns Now
The IRS asked you to file tax returns and didn't get a response. Send the completed returns to the address on the notice within 10 days of the notice date.
Published by the Law Offices of Darrin T. Mish, P.A.•Updated February 21, 2026
General information only, not legal advice. Using this page does not create an attorney-client relationship. This information may be incomplete or out of date and is provided without any guarantee; follow the instructions and deadline on your own notice. Full terms and disclaimer
File the missing returns listed on the notice and send them to the address on the notice within 10 days.
Deadline calculator
Estimate your LT26 deadline
Estimate only. If your notice shows a specific respond-by date, that date controls. Some deadlines run from the mailing date, and a statewide holiday where the IRS office is located can also extend a deadline. Mail early, keep proof of mailing, and if a deadline matters, have a professional confirm it. Terms and disclaimer
See it explained
LT26 in plain English
LT26: what it means, in 30 secondsA 30-second overview from tax attorney Darrin T. Mish: what this notice is, the deadline, and your first move.
What This Notice Means
The IRS previously contacted you to file federal tax returns and didn't receive a response. LT26 tells you that you must file those returns immediately. The notice lists which returns are missing, and you may need to file for more than one year.
LT26 is not a refund or offset notice. It is about unfiled returns.
What to Do
Read the notice and identify every missing return.
Prepare and file each one.
Send the completed returns to the address on the notice within 10 days of the notice date.
If You Already Filed
If it has been more than 10 weeks since you sent the returns, contact the IRS at the toll-free number on the notice.
If You Don't Think You Have to File
Use the IRS "Do I Need to File a Tax Return?" tool for each year involved. If it shows you aren't required to file but the notice says you are, call the number on the notice.
If You're Due a Refund
You may still be required to file even if you're owed money back. To get the refund, you must file within three years of the original due date of the return, or within two years of the date you paid the tax, whichever is later. Wait too long and the refund is gone.
If You Can't Pay When You File
File anyway, and pay what you can to reduce interest and penalties. You can set up an installment agreement for the rest. If you owe less than $50,000, the Online Payment Agreement tool is the fastest route. Otherwise, call the number on the notice or send Form 9465, Installment Agreement Request.
If you received an LT26 and have years of unfiled returns to deal with, call us at (813) 229-7100.
This letter has a clock on it. Don’t run it out alone.
Free consultation with Darrin T. Mish, a Tampa tax attorney licensed since 1993 and admitted to the U.S. Tax Court. Bring the letter.