If you did not receive a stimulus payment during 2020 but you qualify according to your tax return, it will be added. Or if you already received the EIP but qualify for more (due to a drop in income or addition of a dependent) the new amount will be added. On the other hand, if you received a payment but now qualify for less (because of an increase in income) you do not have to repay the amount.
But if you received a payment previously and the amount was correct, it will have no effect on your tax return. It is not taxable, and it is not an offset of any kind.
