The tax ID number is locked at the time you purchase it -- in other words, when you e-file or print. To fix it, you'll have to make a copy of the tax return. You can then contact Intuit to give you a credit so you don't pay twice for the same return. Here's an article on the subject: https://proconnect.intuit.com/community/file-actions/help/ssn-or-ein-appears-grayed-out-and-can-t-be...