When I entered it, it does not give me an option to enter my wife's separate from mine.
It asks "Does this match the amount on Letter(s) for you and" your spouse?
"Enter the exact payment amounts you received-if they aren't exact, the IRS may delay your return. If you or " your spouse "got multiple payments for either round, enter the total, or 0 if you didn't get a payment."
"Enter your total thrid-round payment (issued March '21 - May '21) as it appears on your Letter 6475 from the IRS."
