When you started your return in some versions of TurboTax, the software assumed that you did not receive any stimulus payments. So it started your return with both of the stimulus payments added to your refund.
When you then told TurboTax that you have received the payment or payments, it deducted that amount from your refund so that it was not a double payment.
There is no tax on the stimulus payments, but in some cases the refund goes down by the amount of stimulus payments have already been received.
[edited 2/1/2021 | 07:55 pm PST]
