Quarterly Estimated Tax Calculator
For freelancers and self-employed: estimate the quarterly tax payment due to avoid IRS underpayment penalties.
Inputs
Quarterly payment
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Total annual tax
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Self-employment tax
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Federal income tax
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State income tax
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About Quarterly Estimated Tax Calculator
Safe harbor rule
Avoid penalties by paying either: (1) 90% of current year tax, OR (2) 100% of last year tax (110% if AGI > $150k). Many freelancers just match last year for simplicity.
Due dates
Q1: April 15. Q2: June 15. Q3: September 15. Q4: January 15 of next year. Late payments accrue interest plus a small penalty even if you ultimately get a refund.
SE tax
Self-employment tax (15.3%) covers Social Security (12.4% up to $168,600) and Medicare (2.9% unlimited + 0.9% over $200k). This is on top of regular income tax.