When working with Kimball Construction on your project, understanding Progress Invoice Amounts is essential. These invoices reflect the percentage of work completed and help maintain a steady cash flow. But what should you expect? How do these amounts change over time? Let’s break it down.

How Progress Invoice Amounts Are Calculated

Each invoice is typically based on a percentage of project completion. The calculation follows a straightforward formula:

(Total Contract Price) × (Percentage of Work Completed) = Invoice Amount

For example, if your total contract is $500,000 and 20% of the work is done, the Progress Invoice Amount would be $100,000.

Additionally, some invoices may include costs for stored materials, retainage (a small percentage withheld until project completion), and any approved change orders.

The Typical Pattern of Progress Invoice Amounts

In most construction projects, invoices follow a bell curve pattern. Here’s what that means:

Early Stages (Months 1-3): Lower invoices due to planning, permitting, and initial mobilization.
Middle Stages (Months 4-9): Higher invoices as work accelerates—materials arrive, labor increases, and major tasks are completed.
Final Stages (Months 10-12): Lower invoices as finishing touches are added, with final payments including retainage release.

Graph: Typical Progress Invoice Amounts Over 12 Months

This visual helps illustrate how Progress Invoice Amounts fluctuate throughout a project.

Why Do Progress Invoice Amounts Vary?

Several factors can affect invoice amounts, including:

✔ Project Complexity – More intricate projects require specialized labor, which can impact the billing schedule.
✔ Material Deliveries – If large orders arrive in certain months, invoices may spike.
✔ Weather Delays – Seasonal slowdowns can shift the invoicing curve.
✔ Change Orders – Any modifications to the original contract can increase or decrease invoices.

What You Should Expect Each Month

Here’s a rough timeline of what your Progress Invoice Amounts might look like:

Keep in mind, every project is unique. Kimball Construction will provide a detailed invoicing schedule specific to your job.

Final Thoughts on Progress Invoice Amounts

Understanding Progress Invoice Amounts helps you manage your budget and expectations. Since invoices follow a predictable pattern—low at the start, peaking in the middle, and tapering off at the end—you can plan ahead with confidence.

At Kimball Construction, we ensure transparency in invoicing, so you always know what to expect. If you have any questions about your project’s progress invoices, don’t hesitate to reach out.

Ready to start your project? Contact Kimball Construction today!