Do you mean the 1040ES vouchers? Those are optional. You are not required to make quarterly payments if you do not want to. If you expect to owe at least $1000 at tax time next year, then using those to make estimated payments during the year can help you avoid a big tax bill or an underpayment penalty. But the IRS is not requiring you to use them. You can toss them out if you do not want to use them.