Apply 2020 refund to 2021 estimate

[Derf]

Where do you apply 2020 refund to the 2021 estimated quarterly taxes as requested on the 1040es?

[Just-Lisa-Now- · Accepted solution]

On the 1040ES worksheet is a box to apply the refund to 2021.   

If you double click on Line 36 of the 1040, it should take you there.