TurboTax can help you calculate and print out forms 1040-ES so you can mail in your estimated payments. See:
The postmark date is used to determine if the estimated tax payment is paid on time. Additional payment options are available at the IRS Payment website
Taxes are pay-as-you-go. This means that you need to pay most of your tax during the year, as you receive income, rather than paying at the end of the year.
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