When are quarterly taxes due?

Quarterly estimated taxes are due April 15 (Q1), June 15 (Q2), September 15 (Q3), and January 15 of the following year (Q4). If the date falls on a weekend or holiday, the deadline is the next business day. Missing deadlines triggers underpayment penalties.

What is the safe harbor rule?

The safe harbor rule protects you from underpayment penalties if you pay either 90% of current year tax or 100% of prior year tax (110% if AGI exceeds $150k). Many self-employed people use the prior year method for predictability, then settle up at tax time.

Do I need to make quarterly payments?

Yes, if you expect to owe $1,000 or more in taxes after withholding and credits. This typically applies to self-employed individuals, freelancers, contractors, landlords, investors, and anyone with significant non-wage income. Employees with side income may need to adjust W-4 instead.

Quarterly Tax Calculator - Free Tax Calculator

How to Use the Quarterly Tax Calculator

This free quarterly tax calculator helps you quickly calculate quarterly payment due. Simply enter your values in the fields above and click "Calculate" to see your results instantly.

Understanding Your Results

After entering your information, the calculator will display your results including quarterly payment due, estimated annual tax, safe harbor payment, total remaining (3 quarters). Each result is calculated using standard formulas used by financial professionals and experts in the field.

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