How to invoice like a professional contractor
Contractors get paid faster when invoices are clear, itemized, and sent quickly. Follow these basics on every job:
- Invoice promptly. Send the invoice the day the work is finished, not at the end of the month. Fresh work gets paid first.
- Itemize labor and materials separately. "Replaced water heater, parts and labor" invites disputes. Listing each line item with quantity and rate shows exactly what the client paid for.
- Put payment terms in writing up front. State Net 15, Net 30, or due-on-receipt on every invoice, plus your late-fee policy. Verbal agreements are hard to enforce.
- Number every invoice. Sequential invoice numbers (INV-2026-0001, INV-2026-0002) keep your books clean and make follow-ups easy.
- Reference the job. Include the job site address or PO number so the client can match the invoice to the work, especially for property managers and general contractors.
- Follow up in writing. If a payment is 7 days late, send a polite reminder referencing the invoice number and the late-fee terms you stated.
Frequently asked questions
Is this contractor invoice generator really free?
Yes. The generator on this page is free with no sign-up, no account, and no watermarks. Everything runs in your browser, so your business and client data never leaves your device.
What should a contractor invoice include?
Your business name, address, and phone; the client's name and job-site address; a unique invoice number; the invoice date and due date; itemized line items with quantities and rates; subtotal, tax, and any discount; and your payment and late-fee terms.
How do the trade templates work?
Click a trade (plumbing, electrical, HVAC, landscaping, or general contracting) and the generator prefills common line items with realistic descriptions, quantities, rates, and typical payment terms for that trade. Edit, add, or remove anything to match the actual job.
Can I charge a late fee on an overdue invoice?
In most states, yes, as long as the late-fee policy was disclosed before or at the time of billing. This tool lets you pick a policy (for example 1.5% per month after 30 days) and prints it on the invoice. Check your state and local rules for any limits on late fees.
How do I save the invoice as a PDF?
Click "Print / Save as PDF" and choose "Save as PDF" in your browser's print dialog. The print stylesheet hides the form and outputs just the invoice on a single clean page.