How the IRS describes quarterly estimated taxes
IRS documents describe quarterly estimated taxes as periodic payments made during the year toward income tax and, where applicable, self-employment tax. These payments are intended to cover tax on income that is not subject to regular withholding.
What IRS Documents Describe:
IRS publications and instructions explain that estimated tax applies to income such as self-employment income, interest, dividends, capital gains, rental income, and other income not fully covered by withholding. IRS guidance frames estimated tax as part of the “pay-as-you-go” tax system, where tax is paid throughout the year rather than only when a return is filed.
IRS materials explain that individuals use Form 1040-ES, Estimated Tax for Individuals, to calculate and submit estimated tax payments. The form and its instructions describe an Estimated Tax Worksheet used to project expected income, adjustments, credits, and total tax for the year. IRS documents explain that the calculated annual amount is typically divided into multiple payments during the year.
IRS guidance also discusses that estimated tax payments are generally made in four installments across the tax year. The due dates and methods of payment are described in Form 1040-ES instructions and related IRS publications. IRS documents further explain that making sufficient estimated payments, combined with any withholding, is relevant to determining whether an underpayment applies.
IRS materials emphasize that estimated tax rules and thresholds may vary by year and circumstance, and direct readers to review the instructions applicable to the specific tax year involved.
Where to Find Details:
IRS publications and resources that explain quarterly estimated taxes include:
  • Form 1040-ES, Estimated Tax for Individuals
  • Instructions for Form 1040-ES
  • IRS Publication 505, Tax Withholding and Estimated Tax
  • IRS Publication 334, Tax Guide for Small Business
  • IRS Estimated Tax FAQs (IRS.gov)
Related IRS Explanations
Further reading (official IRS-based guide):
👉 Full 1099-K explanation for self-employed workers (taxguidehq.com)
Disclaimer
“This information is based on official IRS publications and is provided for educational purposes only. It is not tax or legal advice. Tax situations vary, and individuals should consult the IRS or a qualified tax professional for guidance specific to their circumstances.”
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Mark Moran
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How the IRS describes quarterly estimated taxes
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