What this notice is about We sent you this notice to confirm that you registered for an IRS online service. What you need to do If you didn't initiate this registration when accessing one of our online services, immediately call the number on your notice to disable your account. If you requested an activation code by mail, to complete your registration you must: Visit online services to activate your account. Sign in with the username and password you created. Enter your activation code from the notice you received. If you already completed your registration, no action is necessary. Frequently asked questions What happens if someone else used my personal information to register online at IRS? If you didn't initiate this registration, immediately call the number on your notice. Once we verify your identity, we'll disable your online account. Reference Tools Publication 1, Your Rights as a Taxpayer Full list of tax forms and instructions Need Help? You can authorize someone to contact the IRS on your behalf. See if you qualify for help from a Low Income Taxpayer Clinic. If you can’t find what you need online, call the IRS number at the top of your notice or letter.