TL;DR
A contractor invoice needs nine things: your business identity with license number, a unique invoice number, issue and due dates, the job address, itemized labor and materials, the total, payment terms, accepted payment methods, and a late-fee line. Copy the template below into any document tool. Bill the day work finishes, state "due on receipt" or Net 15 rather than Net 30, take deposits on anything over about $1,000, and offer a card or ACH option even though it costs 3 percent, because it collapses your wait from weeks to days.
Most contractors lose money after the work is done. The job went fine; the invoice went out a week late, with no due date, no late fee, and "check preferred," and the payment arrived whenever the customer got around to it. The invoice is a cash-flow tool, and the template below treats it like one.
The template
Copy this structure into Word, Google Docs, or your invoicing app. Every field earns its place; the notes after explain the ones people skip.
[YOUR BUSINESS NAME]
License #[STATE LICENSE NUMBER]
[Address] · [Phone] · [Email]
INVOICE #2026-0147
Issue date: [DATE] · Due: [DATE]
Bill to: [CUSTOMER NAME]
Job address: [SERVICE ADDRESS]
Work performed
Labor: [Description of work] — [hours × rate or flat] . . . $0,000.00
Materials: [Itemized or "per attached list"] . . . $000.00
[Additional line items]
Subtotal . . . $0,000.00
Tax ([rate if applicable]) . . . $00.00
Deposit received [date] . . . −$000.00
TOTAL DUE . . . $0,000.00
Terms: Due on receipt. A late fee of 1.5% per month applies to balances outstanding after the due date.
Pay by: card or bank transfer at [payment link] · check payable to [BUSINESS NAME] · Zelle to [number]
Thank you for your business. Photos of completed work attached.
The fields people skip, and why they cost money
The invoice number. Sequential, unique, and formatted with the year (2026-0147). It is how you, your bookkeeper, and the customer reference the bill, it is what the IRS expects to see in order, and a professional numbering scheme quietly says "this business keeps records," which matters if the invoice is ever disputed.
The due date, in bold. An invoice without a due date is a suggestion. "Due on receipt" or Net 15 is normal for residential service work; Net 30 is a commercial-client convention that homeowners will happily borrow if you offer it.
The late fee line. Stating 1.5% per month (18% a year, under most states' caps, though a few set lower limits, so check yours) changes payment behavior even if you never once collect it. It signals the due date is real. One caveat with teeth: a late fee is generally only enforceable when it appeared in your contract or estimate before the work, not when it debuts on the invoice, so put the same line in both.
Your license number. Required on invoices and contracts in several states, and a trust marker in all of them. It separates you from every unlicensed bid the customer collected.
The deposit line. Showing "deposit received −$500" documents the payment history in one place and shrinks the scary number at the bottom.
Getting paid faster: what actually moves the needle
- Invoice the day the work finishes, from the driveway if possible. Every day between completion and invoice reads as "no hurry" to the customer, and collection difficulty grows with distance from the finished job.
- Take cards and ACH, even at 3 percent. A $3,000 check "in the mail" for three weeks costs more than the $90 fee in float, follow-up time, and occasional non-arrival.
- Deposits on any job over roughly $1,000: a third up front, a third at a milestone on bigger work, balance at completion. Deposits also filter out the customers who were never going to pay well.
- One polite reminder at day 3 past due, a phone call at day 10. Most late payment is disorganization, not refusal; the sequence catches it before it ages.
Invoices are step one. A full follow-up system is the raise.
We build the websites and automations that get service businesses paid attention to, from first call to final invoice.
Deposit, progress, and final invoices
Bigger jobs get a billing schedule, not a bigger single invoice. The pattern that keeps cash flow level: a deposit invoice on signing (a third, or enough to cover materials), progress invoices tied to visible milestones ("rough-in complete") rather than dates, and a final invoice that reconciles everything with the deposit and progress lines shown. Same template each time; only the line items change. Never let the final invoice be the first paperwork the customer sees with real numbers on it.
When the template stops being enough
A document template works until volume breaks it, and volume breaks it at around 10 to 15 invoices a month: numbering gets manual, reminders do not send themselves, and nobody knows what is outstanding without a spreadsheet. That is the point where field service software pays for itself; invoicing, reminders, deposits, and card payment come built in. We compared the main options in best field service software, went deep on the one we recommend most in our Jobber review and its real pricing, and if the choice is between two big names, the Jobber vs Housecall Pro breakdown settles it.
Until then, the template above plus discipline about the day-of-completion send covers what software would do, minus the automation.
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