The distinction between direct job costs and overhead determines whether you know which jobs actually make money. Most trades businesses mix everything together and end up guessing at profitability. Setting up the right categories takes effort upfront but pays off every time you price a job or review your margins.

Parts and materials need two categories minimum. Parts used on billable jobs are direct costs that you recover in your pricing. Parts used for warranty work or callbacks are a separate expense because you’re not billing for them. Mixing these together hides how much warranty work is actually costing you, and that number is usually higher than owners expect.

Truck stock is inventory sitting on wheels. When a tech pulls a part, it should move from inventory to a job cost. This requires tracking discipline. Job tickets need to list parts used with quantities. At minimum, do regular truck counts and reconcile what’s on the truck versus what was purchased minus what was billed out. The difference reveals waste, theft, or warranty parts that didn’t get recorded. Skilled trades businesses in the Houston area often skip this step and lose thousands annually without realizing it.

Fuel can be tracked as direct job cost or overhead depending on your preference and how your routes work. If techs drive to multiple jobs per day across The Woodlands or Greater Houston, allocating fuel to specific jobs gets complicated. Most trades businesses treat fuel as overhead unless they have long-haul service calls where fuel is significant enough to matter for pricing.

Tools break into two categories. Hand tools, drill bits, blades, and consumables under a certain dollar amount get expensed as supplies. Larger equipment like power tools, diagnostic equipment, or specialty tools above $2,500 should be capitalized and depreciated. This affects your taxes and gives you a clearer picture of true operating costs versus capital investment.

Labor needs the same treatment. Hours spent on billable jobs are direct costs. Hours spent on callbacks, warranty work, travel, training, or shop time are overhead. If your payroll system or job tracking doesn’t separate these, you’re flying blind on actual job margins.

The practical implementation usually involves job management software that ties parts and labor to specific work orders. QuickBooks alone won’t do this well without a field service add-on or manual tracking. Some businesses use paper job tickets that get entered weekly. Others use apps that sync directly. The method matters less than consistency.

If your books currently lump everything into generic expense categories, bookkeeping cleanup and catch-up services can restructure your chart of accounts and recategorize historical transactions. Going forward, having proper job costing categories gives you the numbers you need to price work correctly and identify which jobs are worth taking.