What is IRS Code Lookup?
You have a letter from the IRS with a code in the top right corner.
Type that code here and you get what the letter is, the date that matters and the choices it gives you.
A licensed tax professional is a call away if you want help acting on it.
An LT11 dated March 3, 2026, for example, gives you until April 2, 2026 to ask for a hearing, so the clock may already be running on yours. Find the date at the top of your letter before you type the code.
Who answers when I call?
A licensed tax professional goes over your notice with you
Most letters carry a date to act before, like the 30 days on an LT11. A licensed tax professional reads the code, the date and the amount with you and names your choices before that date. Call with the letter in your hand.
Call 855-964-5291What happens when you call
- You call during business hours and say which letter you have.
- A licensed tax professional asks for the date, the amount and the tax years on the letter.
- You hear your options for this notice and decide what to do. Nothing is filed without your yes.
A licensed tax professional answers, not the IRS. The call costs nothing, and you give up nothing by calling. IRS Code Lookup is a private tax help service.
Where do the answers come from?
Each answer links the irs.gov page it comes from, and every page shows when it was last checked.
Is this the IRS?
No. We are a private tax help service, not the IRS, and not a law firm, a tax preparer or an accounting firm. We never take payments for the IRS and never ask for your Social Security number.
Who runs IRS Code Lookup?
IRS Code Lookup is run by IRS Notice Code, 55 E 11th St #1OTH, New York, NY 10003. Email contact@irs-notice-code.com.
Last checked October 2026
What to do now
- Find the code in the top right corner of your letter.
- Type it in the code box and read your briefing.
- Call if you want a licensed tax professional to go over it with you.