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Estimated tax penalty

Varies

Can You Write Off Estimated Tax Penalty?

Short answer: No: the underpayment penalty isn't deductible, and you avoid it by paying 100% of last year's tax (110% over $150,000 AGI).

Pay quarterly by April 15, June 15, September 15, and January 15.

Records to keep: Keep receipts, 1099s or W-2s, a mileage log, and a note of the business purpose. W-2 employees should ask about employer reimbursement.