Invoice Generator for Contractors: Get Paid Faster on Every Job

September 5, 2026 · 5 min read

Contractors face unique invoicing challenges. Projects span weeks or months. Clients expect progress billing. Change orders modify the original scope. Retention holdbacks delay final payment. A generic invoice template does not cover these situations — you need an invoicing approach designed for project-based work.

Progress Billing Invoices

For long projects, invoice at milestones or on a regular schedule (weekly, bi-weekly, monthly). Each invoice should reference the total contract amount, previous billings, current billing, and remaining balance. This gives the client a clear picture of where the project stands financially.

Handling Change Orders

When scope changes, document it on the invoice. List the original contract amount, approved change orders with descriptions and amounts, and the revised total. Never bury change order costs in regular line items — transparency prevents disputes.

Retention and Final Invoices

Many construction contracts withhold 5-10% as retention until project completion. Your progress invoices should show the retention amount being held. Your final invoice releases the retention after the client approves the completed work. Track retention carefully — it adds up across multiple projects.

Getting Paid Faster

Invoice immediately upon completing a milestone — delays signal that payment is not urgent. Include your payment terms prominently (Net 15, Net 30). Offer a small discount for early payment (2/10 Net 30 means 2% off if paid within 10 days). Follow up the day after the due date with a polite reminder.

Try It Now

Our free Invoice Generator handles this instantly — no signup, no limits.

Also useful: our Percentage Calculator for related calculations.