Calculate and schedule quarterly estimated tax payments (Form 1040-ES) for self-employed individuals. Covers self-employment tax calculation (15.3%), income tax estimation, safe harbor rules (100%/110% of prior year), payment deadlines, and underpayment penalties. Trigger on "estimated taxes", "quarterly taxes", "1040-ES", "how much should I pay quarterly", "self-employment tax", "avoid tax penalty".
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Receiptor-AI/bookkeeping-skills72026年6月3日 更新