Nope, can't direct deposit on an amended return.  I agree, annoying, but that's what we've got for now.  The check itself actually shouldn't delay it that much, the wait time for processing the amended return is what will take a long time...even when e-filed.  I always tell these clients 1) not to watch the mailbox, 2) the gov't is a great bank and pays nice interest, BUT 3) that interest is taxable in the year received, so upload a copy of the check before cashing it (because I don't trust them to recognize and keep and give me the 1099-INT next Jan).