Revenue Control in T&M and Cost-Plus Construction Billing

Why Revenue Leakage Is Common on Cost-Reimbursable Projects

Revenue Leakage Often Starts Before the Invoice Is Created

Time-and-materials (T&M) and cost-plus contracts give contractors flexibility and are well suited for projects with potentially changing scope, such as complex capital projects. These flexible contracts can , but only if contractors enforce strict construction revenue controls.

Undisciplined billing processes result in construction revenue leakage, delayed cash flow, excessive administrative burden, and strained client relationships. Why does revenue leakage happen, and how can contractors prevent it?

Revenue leakage is associated with underbilling, yet the issue occurs before invoicing begins. This is because labor, equipment, materials (LEM), and subcontractor costs are not fully captured or transferred into the billing workflow. When information is missing, invoices can’t accurately reflect incurred costs or the correct contract rates, increasing the risk of revenue leakage.

Teams maintain accuracy more reliably in a single system, as fewer touchpoints reduce the potential for mistakes. When field activity, payroll, and billing data are maintained in disconnected systems, earned revenue and billed revenue are more likely to drift apart.

Using a single system, or one that integrates the back office and the field, means information is captured in the moment, making it more likely to be accurate. When LEM data is delayed in reaching the back office, earned revenue increases, but billed revenue does not. When the two are out of sync, there’s a greater chance that some work will never be recorded, leading to underbilling and revenue leakage.

Contracts for complex capital projects can be worth hundreds of millions of dollars or more, so small missed billing items may seem insignificant. However, missing small billing items across multiple billing cycles can add up and create . Contractors lose revenue on T&M and cost-plus contracts when they don’t promptly and accurately record all incurred costs.

In T&M and cost-plus contracts, construction revenue leakage often begins before invoicing due to incomplete cost capture, where small gaps accumulate into underbilling and lost revenue.

Payroll Accuracy Does Not Always Equal Billing Accuracy

In a T&M or cost-plus project, payroll may be accurate: hours worked, correct classification, pay rate, and overtime calculation. Yet the customer invoice may still be off. Paying labor the right amount does not guarantee that labor is billed correctly.

T&M and cost-plus contracts often include client-specific billing rates, craft classifications, overtime rules, and markup structures that differ from payroll. Billing workflows must account for the contract’s complex rules to ensure payroll data and client billing align. Teams need to focus on what they are contractually entitled to bill rather than the amount the work costs them. When the two are misaligned, the results typically include billing delays, underbilling, and revenue leakage.

To minimize these risks, billing teams need visibility into whether billable rates align with approved contract structures before invoices are submitted. By relying on payroll actuals, contracted rates, and approved markups to generate invoices, teams can identify discrepancies before invoices are issued, reducing the risk of billing errors and revenue leakage. The invoice process becomes more efficient, and delays are minimized.

In addition to the revenue-related benefits, accurate, timely invoices can strengthen the relationship between the two parties by giving both confidence that the contract is being fulfilled.

Accurate payroll does not guarantee accurate billing: invoices must apply the contract’s billing rates, classifications, and markups on top of payroll actuals.

Centralized Rate Governance Prevents Underbilling on Cost-Reimbursable Projects

On complex capital projects, general contractors oversee multiple subcontractors and often manage hundreds of billing rate tables across clients, projects, regions, and union agreements. When billing rates are managed in spreadsheets or across disconnected systems, ensuring the correct rates are billed is very difficult. The end result is revenue leakage due to underbilling, billing disputes, and time-consuming reconciliation efforts.

Ensuring construction billing accuracy becomes more challenging when third-party markups on subcontractors, materials, and other reimbursable costs must be applied to invoices. Because markup rules and cost recovery terms vary by project and client contract, manually maintaining construction billing accuracy is complex and error-prone. These costs must be calculated consistently and applied transparently to ensure invoices reflect the contractual agreement. Otherwise, general contractors risk losing revenue on T&M projects and facing billing disputes and payment delays because they can’t substantiate their numbers.

Centralized governance helps contractors maintain billing consistency while protecting margins. A centralized approach enables teams to effectively manage the various rates, markup schedules, and contract-specific billing requirements. It keeps contract-based rates and cost-recovery rules consistent across the organization. As a result, the risk of revenue leakage is reduced, billing disputes are minimized, and payment delays are lessened. Instead, companies gain billing accuracy, improved contract compliance, and full capture of billable revenue.

With centralized governance, teams can justify their T&M and cost-plus construction billing as they have . Accurate and accessible billing data improves transparency, reduces disputes, and strengthens collaboration across teams.

Centralized rate governance reduces billing disputes and payment delays while improving billing accuracy on cost-plus and T&M projects.

How Contractors Can Catch Billing Gaps Before Invoice Submission

To minimize construction revenue leakage in T&M and cost-plus construction contracts, general contractors need visibility into what work has been completed, what costs are billable, and what work has not yet been invoiced. Unlike fixed-price contracts, T&M and cost-plus billing is tied to recorded effort and incurred costs rather than to construction milestones, making accurate and timely cost capture essential.

When billable hours, equipment usage, and material consumption are not captured and approved promptly, contractors lose visibility into revenue. The gap leads to delayed payments and increases the risk of revenue leakage.

Validating billable work as close as possible to when it occurs reduces the potential for revenue leakage. Teams should confirm that labor and other chargeable costs align with the contract terms before they are included in an invoice package. Earlier validation allows teams to identify potential issues with the invoice, such as missing documentation, unsupported charges, and incorrect cost coding, when corrections are still quick to make. By addressing these issues before the invoice is generated, teams reduce the risk of missed revenue, rejected invoices, and delayed payment cycles while improving billing accuracy.

Strong revenue control depends on connected workflows that validate billing accuracy before invoices reach the client. When teams use disparate systems for field operations, project controls, and accounting, billing discrepancies often surface after an invoice is submitted. The late discovery can lead to underbilling, lost revenue, or payment delays.

By implementing effective revenue controls, contractors can be confident they are submitting complete, accurate invoices that are properly documented and aligned with contract requirements. This helps ensure billable revenue is captured and minimizes leakage.

For T&M and cost-plus contracts on capital projects, teams need to capture a large volume of data to create accurate invoices; when that information is stored in spreadsheets, paper records, or disparate systems, manual processing is time-consuming and error-prone. Contractors who use integrated digital tools to capture billable information and validate charges have greater visibility into unbilled work, reduce the risk of underbilling, and improve revenue control.

Strong revenue control over T&M and cost-plus contracts requires timely capture of billables, supported by integrated software systems that improve visibility, consistency, and billing accuracy.