What this notice is about We couldn't locate the return you said was previously filed. What you need to do Read the notice carefully to determine the required form we need. If you have a copy of the original return, please re-sign it and send it to us. If you don't have a copy of the return, visit Forms & Instructions to get a new form or call 800-829-3676. Fill out the Contact Information section of the notice, detach it and send it to us with your re-signed copy or completed form so we receive it by the due date on the notice. You may want to Review your records to ensure we didn't send the original return back because of missing signatures or missing information. Frequently asked questions What happens if I don't respond by the due date? We may consider your return delinquent and begin collection enforcement to secure the return. Who do I call for assistance? For assistance with your business return, call 800-829-0115 or for assistance with Form 990-T, call 877-829-5500. 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.