Progress Invoicing, A Practical Guide for Small Businesses

TL;DR: Progress invoicing means billing a client in stages as work is completed, rather than waiting until the whole project is done. It shortens the gap between doing work and getting paid, reduces risk, and is standard in construction, consulting, and project-based services.

What is progress invoicing?

Progress invoicing (also called milestone or staged billing) is invoicing a client at agreed points during a project instead of only at the end. Each invoice covers the portion of the total value matching work completed.

When to use it

Progress invoicing fits when:

• The project spans weeks or months
• You carry significant upfront costs (materials, labour)
• The contract is large enough that waiting until completion strains your cash
• Industry practice supports staged billing (construction, consulting, design, IT)

How to structure progress invoices

• Percentage-based, a fixed share at each stage (e.g. 25% at start, 25% halfway, 25% at practical completion, 25% at handover).
• Milestone-based, invoice when specific deliverables complete (design signed off, build complete, testing passed).
• Time-based, invoice at regular intervals (weekly, fortnightly, monthly) for work done in that period. Common in consulting.

"Staged billing is the single easiest cash-flow win for a project business, and most owners under-use it. Bill the milestone the day you hit it, don't wait for the project to wrap to start the payment clock."

Shane, Head of Growth, FundTap

Best practices

• Define milestones in the contract, agree invoicing stages before work starts.
• Invoice promptly, send the moment a milestone is reached.
• Describe the work clearly, detail what each invoice covers.
• Track progress vs billing, keep invoicing aligned with actual completion.
• Use retention clauses where standard, a 5–10% retention is common in construction.

Progress invoicing and your cash position

Staged billing shortens the gap between work and payment, but clients may still pay on 30–60 day terms. If you need the cash sooner, FundTap lets you fund progress invoices as soon as they're issued, with the advance in hours instead of weeks (median first fund: 3 days from sign-up; FundTap data, 2026). The selective model means you fund only the milestone invoice you need to, and FundTap's loss rate sits at 0.71% (FundTap, BNZ presentation 2025).

See how FundTap works → Rated 5★ on Google (117 reviews) · 4.9★ on the Xero App Marketplace (107 reviews).

Frequently asked questions

What is progress invoicing?

Billing a client in stages as work is completed rather than at project end. Each invoice covers the portion of total value matching the work done.

What's the difference between progress invoicing and milestone billing?

They're the same idea. Milestone billing is the deliverable-based version of progress invoicing (invoice when a specific stage is signed off).

When should I use progress invoicing?

On projects spanning weeks or months, with significant upfront costs, or where the contract value is large enough that waiting until completion strains your cash.

How do I structure progress invoices?

Use percentage-based stages, deliverable milestones, or regular time-based intervals. Agree the structure in the contract before work begins.

What is a retention clause?

A portion (commonly 5–10% in construction) the client holds back until final completion or a defects period ends, to ensure the work is finished to standard.

Can I fund a progress invoice with invoice finance?

Yes. With FundTap you can fund a progress invoice as soon as it's issued and receive the advance within hours, rather than waiting 30–60 days for the client to pay.