The 1040ES vouchers are optional to use. You are not required to use them. If you expect to owe at least $1000 next year then making estimated quarterly payments helps you to avoid a big tax bill and a possible underpayment penalty at tax time next year. But you can ignore them or shred them if you want to. They are not sent to the IRS---so you can relax. They were not generated due to a bug or a mistake.
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