Progress Invoicing Basics

When progress billing helps

Long projects strain cash flow if you wait until the end. Progress invoicing lets you bill monthly, by completion percentage, or by deliverable while work continues.

• Long projects and retainers
• Construction and dev sprints
• When delivery spans months

Choose a billing method

Percent-complete billing works for construction and software. Deliverable-based billing fits creative work. Match the method to what clients can approve quickly.

• Hours or % complete
• Deliverables this period
• Cumulative total billed

Show remaining contract value

Each progress invoice should show work completed, amount billed to date, and balance remaining. Transparency reduces disputes on the final invoice.

• Compare to approved estimate
• Note scope changes in writing
• Attach timesheet summary if hourly

Example percent-complete calculation

Consider a $20,000 project that is 40% complete at the first billing point. The earned amount is $8,000. If the client already paid a $2,000 deposit that the agreement applies to this stage, the current amount due is $6,000.

The invoice can show the contract value, completion percentage, earned-to-date amount, prior deposit, current charge, total billed to date, and remaining contract value.

Spell out how the percentage was approved; a number without a deliverable or measurement record is difficult for the client to verify.

Create an approval routine

Agree who confirms progress, what evidence they need, and how quickly they should respond. Useful evidence might include a signed site report, accepted design package, completed ticket list, or monthly time summary.

Send the evidence with the invoice and use the same period dates in both. If part of the work is disputed, separate the undisputed amount where the agreement allows instead of making the whole invoice opaque.

Progress billing works when project records and billing records tell the same story.