It’s important to figure what it costs you to be in business.
I go do a panel change out, cost me $500 in materials, and I want to make $160/hour, charged a full day because there wasn't enough time to hit another job after, so $1,280 + $500, I charge $1,780, and conclude “I made a good profit”.
We’ll, at the end of the year I count what I spent, and it cost me $5k for GL, $12k for fuel, $6k for truck repairs, $2k in new tools and repairing tools, $250 for the license, on and on, and now I see that it costs me $25k-year, whether I book no jobs, or 100 jobs.
Then there is fixed vs variable overhead. For example, my gl policy remains the same, whether I do no jobs, or $500k in jobs. But if I do $500k in gross sales, my fuel is going to be much higher than if I sat at home going broke.
But both categories are overhead. And in construction, miscalculating overhead is probably the main reason good tradesmen end up going out of business.