Why did 1040-ES estimated tax vouchers print out? Do I need them?
We'll automatically include 4 quarterly 1040-ES vouchers with your printout if you didn't withhold or pay enough tax this year. We do this to head off a possible underpayment penalty on next year's taxes.
You may get these vouchers if had an uncharacteristic spike in your income this year, for example you sold a bunch of stock or took a large distribution from your retirement plan.
You're not required to make estimated tax payments; we're just suggesting it based on the info in your return. If you feel they're not needed for next year's taxes, you can shred them.