Thanks a lot. I appreciate the help you've given me. My understanding is that to process ITINs, I must first submit my return with my family, apply for the ITINs, and mail the full package (including the other documents) to the IRS address. The IRS letter deadline is September 20, 2024. ITIN processing will take place in 7 weeks. Since I will be receiving my husband's and son's ITINs after the IRS letter deadline, I'm not sure how this will impact me.
Then I have to file my amended return and mail it, along with a letter of explanation, to the office that delivered the deficiency notice after the ITIN is received.
