Those 1040ES vouchers are optional to use. If you expect to owe at least $1000 at tax time next year, using the vouchers or making estimated quarterly payments can help you avoid a big tax bill or an underpayment penalty next year. You are not required to use them. Sounds like you are changing your W-4 withholdings instead, so if you want to just toss out the 1040ES vouchers, that is fine.
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