This page's plumbing invoice bills four lines: a service call or diagnostic, labor, parts and materials, and a permit fee. Separating them is not just tidiness — a client who sees the diagnostic charged on its own, labor billed by the hour, and parts listed at their own cost can tell exactly what they're paying for, rather than working backward from one lump number. It also matches how most plumbing businesses actually track their own costs, since parts and labor come from different sources.
The service call stays its own line even when a repair follows it, since you're paid for showing up and diagnosing the problem whether or not more work happens after. Labor is billed by the hour rather than a flat job rate, and parts get their own line rather than folding into labor so a client can't mistake markup for time. A permit fee only belongs on the invoice when the job actually pulled one — drop the line entirely otherwise.
Add your license number as a note under the business block — many states require a licensed plumber's number to appear on every invoice, and this is where it goes. For work billed to a property manager or landlord rather than the person who lives there, a custom field for the job address keeps the invoice unambiguous about which unit or property the work was done at.
The invoice is the middle step: send the plumbing estimate template first if the client needs a price before you start, convert it to an invoice in one step once they approve it — the lines and numbering carry over — and once it's paid, record the payment on the invoice and issue a receipt for it without retyping anything.
Payment terms and a due date print on the invoice however you set them. Due on receipt is common for a same-day service call; Net 15 or Net 30 fits a larger job billed after the work is complete. Add payment instructions — how you actually want to be paid — so there's no back-and-forth once the invoice lands.