The main idea here is measuring profitability at two different stages of the job. Revenue is the money you bring in from welding work. Direct job costs are the expenses that you can tie directly to a specific job—things like welding consumables, gas, filler materials, direct labor on that job, and any subcontractors who worked on it. Gross profit is what you have left when you subtract those direct costs from the revenue for a job. It shows how efficiently you can cover the job’s immediate costs with the money the job brings in, before considering the bigger, shop-wide expenses. Indirect costs and overhead are the ongoing business costs that aren’t tied to any single job—rent or mortgage on the shop, utilities, insurance, office salaries, administrative expenses, tooling maintenance, depreciation, and similar costs. Net profit is what remains after you subtract those overhead costs from the gross profit. So, gross profit = revenue minus direct job costs, and net profit = gross profit minus indirect costs and overhead. This distinction matters because a job can have good gross profit but still not be truly profitable if overhead is high, whereas managing both layers is essential for a healthy welding business. For example, if a job brings in $100,000 and direct costs are $60,000, gross profit is $40,000. If annual overhead and indirect costs total $25,000, net profit would be $15,000.