No, there is no need to amend your tax return.
Letter 6475 shows the Economic Impact Payment you received in 2021. When filing your return in TurboTax, you would have been asked how much payment you had received. TurboTax, would have provided you with the amount you should have received based on the information you had entered. If you clicked on Yes, that means you agree with the amounts you received are same as the one TurboTax is suggesting and this would have had no further impact on your tax return.
However, if you clicked on No, it would have asked you to manually type in the amounts you received and this amount should tie with the Letter 6475 you received. Also, this amount should be the total of what you and your wife received. If you entered the correct amounts you received and this total ties to what you have on your Letter 6475 and what your wife has on her own Letter 6475, then no change is needed.
However, if the amounts you entered don't tie with the amounts listed on Letter 6475, then this will cause delays to your refund. You don't need to amend your return and the IRS will adjust the amounts accordingly. However, due to this, your refund will now be delayed and it will take extra time for the IRS to process your return.
