Yes, you may prepay federal taxes by filing Form 1040ES with the IRS which is used for estimated tax payments. Estimated taxes are generally filed by self employed individuals who have no tax withheld from their checks, or by anyone who receives an untaxed amount of money that they will need to report at the end of the year. These estimated payments are generally filed quarterly. The date for the first quarterly filing has already passed, however, you can simply make payments for the remaining three quarters.
I am giving you a link to Form 1040ES with the instructions for using the form.
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