07/16/2026
Q3 estimated taxes are due September 15. That feels far away. It isn't.
If you're an HVAC, plumbing, or electrical contractor with a strong summer, your Q3 number is bigger than your Q2 number. Summer is when the trades make most of their year. The tax bill that comes with it follows.
The move now, not in September:
Pull your year-to-date P&L through the end of June. Look at the gross profit. If it's already past what you projected for the full year, you're behind on estimates. Send something before the September deadline so the meter stops.
A few rules of thumb:
If your business income jumped 25% or more from last year, last year's safe harbor number won't protect you in April. The bigger the jump, the bigger the catch-up.
Self-employment tax adds 15.3% on top of your income tax. If you're forecasting in your head, don't forget that piece.
If your Q1 and Q2 payments together cover roughly half of last year's total tax bill, you have room. If they don't, Q3 is where you fix it.
The penalty for skipping a quarter compounds until you actually pay. Better to overpay in September than write a panic check in April.
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