What it means
For non-finance managers, understanding progress billing is essential when dealing with long-term projects, large contracts, or custom manufacturing. When a project takes months to complete, waiting until the very end to get paid can create massive cash flow problems.
You would still need to pay your staff, buy materials, and cover overhead costs during that time. Progress billing solves this by breaking the total contract price into smaller, manageable chunks.
In practice, you agree with your client beforehand on a schedule of payments. This might be tied to calendar dates, physical milestones like finishing the foundation of a building, or the percentage of completion.
As each milestone is met, you issue an invoice for that specific portion of the work. This keeps money flowing into your business regularly, reducing the financial strain of funding a large project out of your own pocket.
From an accounting perspective, progress billing requires careful tracking. You must match the revenue you invoice with the actual costs incurred to ensure your profit margins remain accurate.
If you bill too much too quickly, you risk annoying your client. If you bill too slowly, you risk running out of cash.
Finding the right balance helps maintain a healthy relationship with your client while keeping your business financially secure.
In practice
Real-world examples.
Example
A custom software agency building a digital platform for a client splits a ten thousand pound project into four progress payments of two thousand five hundred pounds tied to key design and coding milestones.
Example
An interior design firm renovating a local office charges a medium-sized enterprise in three stages: a deposit upfront, a second payment halfway through, and the final balance upon completion.
Example
A manufacturing business creating custom machinery for a large factory uses progress billing to request twenty percent upfront, fifty percent upon delivery of parts, and thirty percent after installation.
Think of it
“Imagine paying for a custom three-course meal at a high-end restaurant. Instead of paying only when the entire meal is eaten, you pay for the starter, then the main course, and finally the dessert as each plate arrives at your table.
Formula
Calculation
Total Contract Price x Percentage of Work Completed = Amount Billed to Date. Subtract any amounts already billed previously to find the current invoice total. For example: A fifty thousand pound project is forty percent complete. Total billed so far is twenty thousand pounds. If previous invoices total fifteen thousand pounds, the current invoice is five thousand pounds.Case study
Seen in the real world.
Apex Fitout, a commercial interior design company, secured a sixty thousand pound contract to refurbish a local community centre. The project was scheduled to last three months, involving heavy upfront costs for materials and labour. Without progress billing, Apex would have faced severe cash flow pressure, struggling to pay wages and suppliers before receiving a single lump sum at the end.
Instead, Apex agreed to a progress billing schedule with the client. They divided the project into three milestones: a twenty percent deposit upon signing, forty percent after completing the structural demolition and wiring, and the remaining forty percent upon final handover.
When the demolition phase finished, Apex issued an invoice for twenty-four thousand pounds. This steady stream of income allowed Apex to pay their subcontractors on time without drawing on emergency credit. The project finished on schedule, and the final invoice was settled smoothly. By using progress billing, Apex maintained a healthy cash buffer and delivered the project without financial stress.
Watch out
Common mistakes.
- Failing to clearly define the billing milestones in the initial contract, leading to disputes over when payments are actually due.
- Forgetting to subtract previously billed amounts, which results in accidentally double-billing your client.
- Falling behind on issuing invoices as work progresses, which defeats the cash flow benefits of the method.
Questions
People also ask.
How do I calculate the percentage of completion?
You can calculate it by comparing the costs incurred so far against the total estimated costs for the entire project, or by evaluating physical progress against the project scope.
Is progress billing only for construction companies?
No. While common in construction, it is widely used in software development, manufacturing, consulting, and any industry involving long-term projects and high costs.
What happens if a client refuses to pay a progress invoice?
Clear contracts should outline your right to pause work until overdue payments are settled, protecting your business from taking on further unpaid risk.
From the founder's library
Take it further with the book.
Build your financial confidence beyond this definition. Shihan's full-length guide, Accounting Fundamentals, takes the same plain-English approach and turns it into a complete, practical playbook for non-finance managers, business owners and students - with chapter-end quiz answers and presentation slides included.
25% off with code MMHQ25, applied at checkout. Priced in USD - checkout may show the equivalent in your local currency.
View the book and save 25%Related