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How to Calculate The Cost of Working Capital Per GC, Based on Average DSO

Read time: 2 minutes
Published: January 30, 2025

Subcontractors incur more costs from their clients than they realize. When you use your own working capital to fund projects, things like delayed payments increase the interest you pay on your working capital. To that point, each client costs you something in the form of interest, inflation, and even lost opportunities, but subcontractors rarely recognize these costs, let alone know how to quantify them.

In a recent Meetup, construction consultant and fractional CFO Josh Luebker covered an exceptionally important but often overlooked metric: the monthly cost of working capital, by client. To make it easy, we’ve created a calculator to help you measure this important metric. 

Understanding this metric and how to calculate it will help you identify:

  • Which of your customers pay you “well”/with optimal DSO
  • How much your working capital costs you based on average DSO for each client
  • How much you need to add to your bids with each customer to offset the cost of waiting for payment

Once you’ve finished your calculations, you’ll be able to:

  • Critically examine your DSO broken out by each client so that you can determine:
    • Which clients should be prioritized based on hard data
    • Which clients you need to have hard conversations about payment timelines. 
  • Assess some of your best clients through a new lens – how quickly they pay and how DSO affects your working capital costs 

To get started, download the calculator.

Download the Calculator Here

Next, you’ll need to input project-specific DSO for each client on the first tab so you can calculate the average DSO per client. You should be able to find this information in your Quickbooks or calculated from your last project. Then, add information on each of your working capital options—including their average interest rate and monthly balance—to calculate the daily cost of financing both as a dollar amount and as a percentage.

Once you have the daily percent cost of financing, you will multiply that by the customer’s average DSO to determine what percent you need to add to your bids to account for the cost of capital for that particular client. 

You can follow the step-by-step guide for how to do this following the information in the video below. 

As Luebker points out from Billd’s Subcontractor Market Report, subs who account for the cost of capital in their bids are 11% more profitable than those who don’t. Extended DSO can erode profit, and that is why these calculations are so essential to make and act on. If you habitually work with customers who take too long to pay, you may find yourself losing money on jobs, effectively paying your customers to do work for them. 

To get started with making your own insights, download the calculator, get your financial figures ready, and watch the video. You can also see the full Meetup available on demand here.

About Billd: Billd is revolutionizing the way the commercial construction industry thinks about money. We provide subcontractors with purpose-built capital solutions designed for the industry’s unique challenges. Together, we empower businesses to protect their cash for improved predictability and profitability.

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FAQs

How does the monthly cost of working capital calculator help subcontractors?

The calculator helps subcontractors identify:
Which customers pay with optimal DSO (Days Sales Outstanding)
How much working capital costs based on average DSO for each client
How much to add to bids with each customer to offset the cost of waiting for payment

What information do subcontractors need to use the working capital cost calculator?

Subcontractors need to prepare:
Project-specific DSO for each client
Working capital options details (average interest rates and monthly balances)
Average DSO per client (typically found in Quickbooks or from last project)

How can accounting for the cost of capital in bids benefit subcontractors?

According to Billd's Subcontractor Market Report, subcontractors who account for the cost of capital in their bids:
Are 11% more profitable than those who don't
Prevent profit erosion due to extended DSO
Ensure they aren't losing money by effectively working for free
Can make data-driven decisions about client relationships and payment terms

Travis Mayor

Travis is the Director of Strategic Partnerships at Billd. He thrives in guiding subcontractors through the intricate landscape of financial management, offering tailored solutions to enhance cash flow efficiency and maximize profitability. His mission is to empower commercial subcontractors with the knowledge, tools, and resources they need to thrive in today's dynamic business landscape.

Are you ready to unlock more working capital for your business?