@LP1968 - you can reduce your Sept 15 estimated payment by the amount of your 2021 refund that you are requesting be rolled to the 2022 tax return.
What @fanfare means is that when the IRS calculates whether or not you owe a penalty for 2022 (and the whole idea of the estimated payments is to avoid that!), the IRS will credit the 2021 refund as being received on April 15, 2021 and not on the day you settled your 2021 tax return - that is to your benefit.
