How Growing Contractors Can Calculate Working Capital Needs and Price Jobs for Profit

Key Takeaways 

• Growth can drain cash faster than it creates profit. More backlog means more payroll, materials, and project costs must be funded before payment arrives. 

• Working capital should influence every bid. Jobs with longer payment cycles or higher upfront costs need enough margin to cover the cost of carrying that work. 

• The goal is not simply to charge more. Contractors can protect customer relationships by pricing based on project risk, cash demands, and payment timing rather than applying broad price increases. 

Growing contractors can be profitable on paper and still run short of cash. As backlog increases, more money may be tied up in payroll, materials, mobilization, and receivables before customers pay. Billd’s 2026 National Subcontractor Market Report found that subcontractors waited an average of 51 days for payment after submitting a pay application. That makes working capital planning an important part of both growth and pricing strategy.

What Counts as Working Capital for a Contractor? 

Working capital is current assets minus current liabilities. Cash and receivables contribute to the calculation, while accounts payable, accrued payroll, and short-term obligations reduce it. Contractors should also remember that banks and sureties may exclude certain assets, including some inventory, prepaid expenses, related party receivables, and past due receivables, when evaluating adjusted working capital. 

How Much Working Capital Does a Growing Contractor Need? 

The amount of working capital a growing contractor needs depends on overhead, backlog, mobilization costs, and the payment cycle. One practical construction finance framework evaluates three demands together: 

• Approximately three months of overhead 

• A mobilization reserve of roughly 10% of active backlog 

• Enough capacity to carry receivables through the normal payment period 

For example, a contractor starting a $600,000 project may need roughly $40,000 to $80,000 for equipment, materials, labor, and insurance before receiving the first project payment.  When several projects mobilize simultaneously, those upfront costs can quickly consume available cash. As a practical planning benchmark, contractors can consider maintaining mobilization reserves equal to roughly 10% of active backlog, then adjust that target based on project mix, payment terms, overhead, and the timing of major expenses. 

These are planning benchmarks rather than a universal formula. The larger the projects and the longer the collection cycle, the more financial capacity the business may need. 

Why Does Backlog Increase the Need for Working Capital? 

Backlog, or the amount of work a contractor has committed to complete and must finance before collecting payment, increases working capital needs because contractors often spend money well before they receive revenue. Working capital can help determine how much backlog a contractor can support without placing excessive strain on financial resources. For many small and mid-size trade contractors, a common planning approach is to estimate supported backlog at roughly 10 times available working capital.  

Owners should monitor whether growth is causing: 

• Higher payroll and material commitments 

• More simultaneous project mobilizations 

• Larger receivable balances 

• Greater dependence on credit to cover routine expenses 

How Should Contractors Account for Working Capital When Pricing Jobs? 

Contractors should include the cost of carrying project expenses when evaluating whether a bid will produce an adequate margin. This is increasingly important as labor and material costs rise and customers take weeks to pay. 

The Sixth Annual National Subcontractor Market Report found that subcontractors pricing the cost of capital into bids reported average profit margins of 14.6%, compared with 11.7% for those that did not. Those contractors were also more likely to report year-over-year growth. 

Price According to Cash Demands 

An across-the-board price increase is not the only way to strengthen margins. Contractors can evaluate each project based on its expected payment timing, upfront costs, supplier terms, and capital requirements. 

Projects with longer collection periods or heavier early spending may require a greater margin to offset the additional cash burden. Working with predictable collections and lower capital requirements may allow for more competitive pricing. This project-specific approach can help owners protect profitability without unnecessarily increasing prices for every customer. 

Build Capacity Before Adding Volume 

Profitable growth should strengthen working capital rather than continually consume it. Owners can support that goal by improving billing speed, retaining appropriate earnings, negotiating supplier terms, and avoiding the use of operating cash for large long-term asset purchases.  

Working capital should therefore be reviewed before adding significant backlog, not after cash becomes tight. Connecting financial capacity with pricing decisions gives contractors a clearer picture of which jobs support sustainable growth and which may create more cash pressure than their margins justify. 

If you are planning to take on larger projects, build a backlog, or adjust pricing, consulting with your CPA can help you assess whether your working capital is sufficient to support growth and identify opportunities to strengthen cash flow and profit margins.

Bill Keyser, CPA

I help businesses fill in the gaps to increase profitability and growth.

See Full Bio