Quarterly Tax Payments: How to Calculate and Never Miss a Deadline
Tax Strategy · 2026-03-20 · 7 min
If you are self-employed or your business does not withhold enough tax, you need to make quarterly estimated payments. Here is how to calculate them and avoid underpayment penalties.
Quarterly estimated tax payments are required when you expect to owe $1,000 or more in tax for the year and your withholding will not cover the obligation. This applies to most self-employed individuals, freelancers, and business owners who take distributions rather than salary. Missing a payment triggers an underpayment penalty, even if you pay the full amount by April.
The safe harbor method is the simplest calculation: pay 100% of last year total tax liability divided by four. If your income is above $150,000, the threshold is 110%. As long as you meet this amount, you cannot be penalized for underpayment, even if your current year liability is much higher.
The current-year method is more accurate but requires ongoing bookkeeping: calculate your actual tax liability based on year-to-date income and pay 25% of the annual estimate each quarter. This avoids overpaying if your income drops, but requires regular financial updates.
The deadlines are fixed: April 15, June 15, September 15, and January 15 of the following year. Note the uneven spacing — Q2 is only two months, not three. Set calendar reminders two weeks before each deadline to calculate and schedule payment. Better yet, use an accounting system that tracks your estimated liability automatically.
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