Quarterly Estimated Tax Calculator
Calculate quarterly estimated tax payments for self-employed, freelancers, and 1099 workers. Includes SE tax, federal income tax, and 2025 IRS due dates.
Reviewed for accuracy by Marcus Webb and the Blueprint Dynamics editorial team (last updated July 2026). Our calculators use primary-source formulas and are cross-checked against IRS publications, Fannie Mae guidelines, and Federal Reserve data. Learn more about our methodology.
For self-employed, freelancers, and 1099 contractors — 2025 tax year
Quarterly Estimated Tax Payment
$3,599
Due: April 15 / June 16 / Sep 15 / Jan 15
Annual tax breakdown
Uses 2025 standard deduction ($15,000). State income taxes not included.
Who needs to pay quarterly estimated taxes
The IRS requires quarterly estimated tax payments from anyone who expects to owe at least $1,000 in federal taxes for the year after subtracting withholding and credits — and whose withholding will cover less than 90% of their current-year tax or less than 100% of last year's tax (110% if prior-year AGI exceeded $150,000). This applies to self-employed individuals, freelancers, independent contractors, business owners, investors with significant dividend or capital gain income, and anyone with substantial income that isn't subject to employer withholding.
2025 quarterly due dates
Q1 (income earned January 1 – March 31): due April 15, 2025. Q2 (income earned April 1 – May 31): due June 16, 2025. Q3 (income earned June 1 – August 31): due September 15, 2025. Q4 (income earned September 1 – December 31): due January 15, 2026. Note that Q2 covers only two months of income but is due only two months after Q1 — the unusual cadence catches many new self-employed people off guard.
How to calculate each payment
Method 1 — Annualized income: Estimate your annual net self-employment income, calculate your total expected tax (SE tax + income tax), divide by four, and pay that amount each quarter. This is most accurate but requires estimating income you haven't earned yet. Method 2 — Safe harbor: Pay exactly 100% of last year's total tax liability divided into four equal payments (25% each quarter). If your prior-year AGI exceeded $150,000, pay 110% of last year's liability. The safe harbor method completely eliminates underpayment penalties regardless of how much your income grows — a major advantage for businesses with rapidly growing revenue.
Underpayment penalties
Missing a quarterly payment or underpaying triggers an IRS underpayment penalty — currently 8% annualized on the underpaid amount for each quarter it was short. This penalty is calculated separately for each quarter, so a large Q4 payment cannot retroactively fix an underpayment in Q1. The penalty accrues from each quarterly due date until either the deadline or the date you pay the tax, whichever comes first. It appears on your tax return as a separate line and is not deductible.
State estimated taxes
Most states with an income tax also require quarterly estimated tax payments, generally mirroring the federal schedule and threshold. State underpayment penalty rates and safe harbor rules vary — California, for example, requires 30% of annual liability in Q1 (not the standard 25%), and its safe harbor threshold is different from the federal rules. Check your state's department of revenue for state-specific due dates and requirements.
Worked example
Freelancer with $100,000 expected net SE income. SE tax: $14,130. Income tax (after SE deduction and standard deduction, single filer): approximately $13,500. Total expected federal liability: $27,630. Quarterly payment using annualized method: $6,908 each quarter. Using safe harbor (prior-year liability was $22,000): pay $5,500 per quarter and owe the difference at filing — no penalty regardless of actual income.