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Tax planning guide

Estimated taxes, in plain English

People with income that is not fully covered by withholding may need to make estimated tax payments during the year. Form 1040-ES is the IRS worksheet for estimating and paying individual estimated tax.

A sensible workflow
  1. Track income and expenses as they happen.
  2. Separate business activity from personal spending.
  3. Estimate annual income, deductions, credits, and tax.
  4. Compare withholding and prior-year obligations.
  5. Review the result with a qualified professional before paying.

Estimated tax planning is personal: filing status, other income, credits, withholding, state rules, and safe-harbor provisions can all change the result. A calculator on this site cannot determine what you owe.

Use the current IRS instructions rather than an old blog post, and keep a copy of each payment confirmation with your records.

Source: IRS: About Form 1040-ES and 2026 Form 1040-ES PDF.

Keep your source records organized.
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