Strategy, Legal & Operations

Progress billing: Definition, benefits, and how to implement

Explore what progress billing is and which industries rely on it most. This article will walk you through how progress billing works and how to implement it smoothly in your law firm.

October 3, 20255 min read Share

If you’ve ever worked on a project that takes weeks—or even months—you know the waiting game can be brutal.

You put in the hours, deliver results, but can’t bill until everything is wrapped up.

Meanwhile, cash flow gets tighter, and managing expenses feels like juggling fire.

That’s where progress billing can help.

Instead of waiting until the very end, this method lets you invoice your clients as portions of the project are completed.

It’s like breaking one giant invoice into smaller, manageable chunks—keeping your revenue steady and your clients informed.

In this guide, we’ll break down the progress billing meaning, show you which industries rely on it most, and walk you through how to implement it smoothly.

Here’s what we’ll cover:

What is progress billing?

At its core, progress billing is an invoicing method where you bill clients based on the percentage of work completed instead of waiting until the project is fully done.

Think of it as a pay-as-you-go approach.

You finish a phase, send the invoice, and keep the project moving—without waiting months for a lump-sum payment.

It’s a lifesaver for industries where projects stretch out over time.

Which industries use progress billing?

Not every business needs progressive billing, but for industries with long-term contracts and phased deliverables, it’s a game changer.

You’ll see progress billing in accounting most often in:

• Construction and engineering.
• Architecture and design.
• Consulting and legal services.
• Software development.

For these industries, it’s not just about billing—it’s about keeping projects financially healthy from start to finish.

Common progress billing features

If you’re new to progress billing, there are a couple of common features you’ll come across that you should be understand.

Schedules of values

This is basically a detailed breakdown of all the project components and their associated costs.

Scheduled of values is like the billing blueprint, making sure everyone—contractor, client, consultant—is on the same page about what’s been done and what’s being billed.

Percentage retained

Another common progress billing feature is percentage retained (or retention).

Clients will often hold back a portion of payment until the project is 100% complete.

Why? It protects them from paying in full for work that isn’t finished or doesn’t meet quality standards.

Retention ensures accountability while keeping trust intact.

Benefits of progress billing

So why go through the trouble of setting up progress billing?

Simple—it offers a ton of advantages, like:

• Improved cash flow: payments roll in during the project, not just at the end.
• Reduced financial risk: no scary, giant invoices that clients hesitate to pay.
• Enhanced transparency: clients can track progress and see exactly where their money is going.
• Better project management: milestone-based billing keeps everyone motivated to deliver on time.

It’s no wonder progress billing has become the preferred approach for so many project-based businesses.

What’s included when progress billing for a project?

A progress billing sample invoice usually includes:

• Project name and contract details.
• Schedule of values.
• Percentage of work completed.
• Amount previously billed.
• Current billing amount.
• Retention amount.
• Total billed to date.

This format keeps billing cycles clear, professional, and consistent. No confusion, no messy back-and-forth emails.

Progress billing example

Let’s bring this to life with an example.

Imagine a construction firm takes on a $500,000 commercial build.

After finishing 25% of the work, they send a progress billing invoice for $125,000.

With a 10% retention, the client pays $112,500 right away.

The remaining $12,500 gets paid when the project is complete.

See how it works? It spreads payments out fairly while protecting both the firm and the client.

Progress billing challenges

Of course, no system is perfect. Progress billing does come with a few hurdles, such as:

• Complex tracking: you need accurate documentation to prove progress.
• Client disputes: if clients question the percentage of completion, payments can stall.
• Retention management: keeping tabs on withheld amounts can get tricky.

Luckily, efficient legal accounting and billing software takes most of the headache out of these challenges.

How to implement progress billing

Ready to try progress billing in your business? Here’s a simple roadmap:

1. Define project milestones: break your project into measurable phases.
2. Create a schedule of values: assign costs to each piece.
3. Track progress accurately: use tools to monitor percentage completion.
4. Invoice regularly: send bills as each milestone is hit.
5. Manage retention: clearly spell out retention terms in the contract.

Automation tools like Sage Timeslips make this even easier, combining time tracking, billing, and reporting into one system.

Progress billing and cost overruns

Now, what happens when projects go over budget? Cost overruns can throw a wrench into your billing plan.

To stay on track:

• Monitor budgets closely.
• Communicate changes early.
• Adjust billing schedules when necessary.

Using software that tracks both time and expenses helps you stay proactive—and avoids unwelcome surprises when invoicing.

Manage progress billing with Sage solutions

If you want to simplify the whole process, Sage Timeslips is a great place to start.

With customizable billing templates, integrated time tracking, and robust reporting, Sage makes it easy to:

• Automate billing workflows.
• Track progress in real-time.
• Handle retention and cost overruns.
• Ensure compliance and transparency.

Whether you’re in construction, consulting, legal, or software, Sage gives you the flexibility and control you need to make progress billing work for you.

Final thoughts

So, what is progress billing really about?

It’s not just splitting up invoices—it’s about protecting your cash flow, reducing risk, and building stronger client relationships.

By breaking payments into phases, you create a billing system that’s fair, transparent, and efficient.

And with software like Sage Timeslips, you can automate the process, save time, and keep your projects on budget.

In other words, progress billing isn’t just good for your finances—it’s good for your business.