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For a project that takes weeks or months, invoicing only once — at the very end — means carrying the full cost of your time and materials until the last possible moment. Progress invoicing splits the total into payments tied to milestones, so cash comes in as the work does.
How to split the milestones
There's no single right way to divide a project, but a few common patterns work well:
- By phase. Design, then build, then finish — each phase invoiced on completion. Natural for work with clear, sequential stages.
- By percentage complete. 25% at kickoff, 25% at the halfway mark, 50% on delivery — useful when the work doesn't break cleanly into distinct phases but progress is still trackable.
- By calendar. Monthly invoicing for a project of known duration, regardless of exactly what's been completed that month — common for retained, ongoing work rather than a project with a hard endpoint.
Whichever pattern you choose, agree on it — and the amounts tied to each milestone — before work starts, ideally as part of the original quote.
What each progress invoice should show
Every invoice in the sequence should make clear which milestone it covers, the amount for that milestone specifically, and — ideally — the total project value and what's been invoiced so far. A client shouldn't have to dig through old invoices to know where the project stands financially; each new one should make that obvious on its own.
Handle scope changes explicitly
Long projects are the ones most likely to have scope shift partway through. When that happens, don't silently fold the change into the next progress invoice — note it clearly, and if the change is significant, treat it as its own line item or even its own invoice, so it doesn't get lost inside a milestone payment the client was already expecting.
Reconcile at the end
The final invoice should tie everything together: total project value, total already invoiced across all milestones, and — if any — a final balance due. This closing summary is what makes progress invoicing feel organized rather than like a series of loosely connected bills.
Splitting a big project into staged payments isn't just about your own cash flow — a client who sees steady, itemized progress billing tends to trust that the project itself is on track, too.