Should you be making estimated tax payments?
During the tax year you must prepay a substantial amount of the taxes you'll owe for that year, or you risk being hit with an underpayment penalty. If you're an employee, that's usually not a problem. Your employer will withhold taxes from each paycheck. You can adjust the amount withheld so that it covers your total tax bill, even if you have extra income from moonlighting or investments. But if you're self-employed or retired, you might need to make estimated tax payments.