What this notice is about Someone used your personal information to access an IRS online service. What you need to do If you accessed this service, you don't need to do anything. If you did not access this service, please immediately call the number on your notice. Frequently asked questions What happens if someone else used my personal information to access IRS online services? Immediately call the number on your notice. Once we verify your identity, we'll disable your online account. If you have questions related to the child tax credit, you can find more information at Advance Child Tax Credit Payments in 2021. Reference Tools Publication 1, Your Rights as a Taxpayer Publication 17, Your Federal Income Tax 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.