April 15 is not only the deadline for filing your 2020 tax return, it’s also the deadline for the first quarterly estimated tax payment for 2021, if you’re required to make one.
You may have to make estimated tax payments if you receive interest, dividends, alimony, self-employment income, capital gains, prize money or other income. If you don’t pay enough tax during the year through withholding and estimated payments, you may be liable for a tax penalty on top of the tax that’s ultimately due.
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