I made some unexpected capital gain later this year. And my regular tax withheld from paycheck does not seem to be enough. I am concerned I will underpay the tax this year. I wonder how should I make one time payment to the IRS? Is this called estimated tax payment?
If so, which form should I choose to pay for? 1040? or 1040ES? And how should I file this with TurboTax later next year? Do I get a form to import to TurboTax?
