Why do I have a 2023 Form 1040-ES payment voucher if I am getting a refund?

They print out for everyone, but you can disregard them since you are getting a refund, you paid in enough throughout the year.

"We'll automatically include four 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 you're self-employed or had an uncharacteristic spike in your income this year. For example, you sold 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."