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Quarterly estimated tax

Prepayments of federal income tax due four times a year for people with under-withheld income.

Why it matters

Due April 15, June 15, September 15, and January 15. Required if you'll owe $1,000+ at filing. Safe-harbor rules: pay 100% of last year's tax (110% if AGI over $150k) or 90% of the current year's expected tax.

Educational only — not financial, tax, or legal advice.