1040ES vouchers are for Pre-paying 2021 taxes...not for your balance due for the 2020 taxes you are filing now.
The 2021 1040ES vouchers are prepared/printed if you owed over $1000 this year, so that you can pre-pay taxes during the coming year and not owe so much next year. OF course, you don't have to use them (the IRS does not know they were prepared).......and you can increase withholding at a W-2 job instead, or ignore them entirely if you are pretty sure that your 2021 tax situation will be such that you won't end up owing so much at tax time next year.
____________*Answers are correct to the best of my knowledge when posted, but should not be considered to be legal or official tax advice.*
