How milestone billing works
Each milestone in a contract has an agreed invoice amount attached to it, and a bill is only sent once that specific milestone is confirmed complete. This differs slightly from general progress billing, which is often based on percentage of completion rather than specific deliverables being finished.
Milestone billing works well for projects with clear, distinct phases, like software development or product design, where it is easy to define exactly when a stage is done. It gives the client confidence they are only paying for completed work, and gives the business a predictable, deliverable-based cash flow pattern.
Example
A software vendor agrees to a $90,000 project with three milestones: requirements approval, $20,000, beta release, $40,000, and final delivery, $30,000. After the client approves the requirements document, the vendor invoices the first $20,000. The remaining $70,000 is billed only as the beta and final milestones are actually reached and confirmed.
Milestone billing in QuickBooks Online vs Xero
QuickBooks Online can handle milestone billing using progress invoicing from an estimate, billing specific amounts as each milestone is reached. Xero does not have a built-in milestone feature, so businesses typically issue a series of standard invoices linked back to the original quote as each milestone is completed.
Common mistakes
- An invoice is sent before a milestone is actually confirmed complete by the client, creating a dispute over whether the bill was even earned yet.
- Milestone amounts in the contract are not clearly tied to specific deliverables, so the client and the business disagree over when a bill is actually due.
- A missed or delayed milestone is billed anyway to keep cash flowing, which damages trust with the client once the mismatch is discovered later.
Why it matters
Milestone billing ties cash collection directly to confirmed deliverables, which gives clients confidence they are only paying for completed work. When milestones are billed before they are genuinely finished, a business risks disputes, revenue recognized too early, and damaged client trust. For project-based businesses, keeping a clear log of which milestones are actually done and billed protects cash flow and the client relationship over the life of the project.
Related terms
How LedgerBPO handles milestone billing
We manage milestone billing schedules, confirming each deliverable with your project team before the related invoice goes out. A dedicated accountant keeps a running log of which milestones have been billed and which remain. You get accurate, timely invoicing that matches exactly what has been delivered to the client.