When a security guard invoice arrives with a rate higher than the contract rate sheet, the instinct is often to flag it as an error. But according to Jesse Wilson of VendorVariance, a higher rate is not automatically wrong. The real question is whether the contract allowed it, whether the required approval happened, and whether the new rate was billed from the correct effective date.
In a recent interview, Wilson shared practical insights from his approach to reviewing guard invoices. He outlined the common sources of rate discrepancies, the gaps in typical online guidance, and the premature conclusions people tend to draw before checking the agreement.
What usually drives a higher-than-expected rate
Wilson said the first thing he looks for is whether the rate actually changed somewhere else in the agreement. "An amendment, renewal, wage adjustment, annual escalation, or other approved change," he explained. After that, he examines overtime and holiday premiums, supervisor or specialty rates, and any added fees.
"A higher rate is not automatically wrong," Wilson emphasized. "The question is whether the contract allowed it, whether the required approval happened, and whether the new rate was billed from the correct effective date."
This approach shifts the focus from a simple comparison against the original rate sheet to a broader review of the entire contractual framework. For readers new to invoice auditing, it highlights the importance of maintaining a complete and current set of contract documents.
The missing piece in most invoice-checking advice
Much of the online guidance about checking guard invoices focuses on verifying the hourly rate and doing the math. Wilson believes that is only part of the picture. "The bigger issue is often whether the billing is actually supported," he said.
He listed several questions that should be asked: Were the overtime hours authorized? Do the billed hours line up with the schedule or available service records? Was an extra guard approved? Is a vehicle, equipment, or administrative fee already included in the contract rate? Were there credits that should have been applied?
"An invoice can add up perfectly and still not match the agreement," Wilson noted. This point is particularly relevant for organizations that rely solely on arithmetic checks. As Wilson suggests, a mathematically correct invoice may still contain charges that are not supported by the contract or by service records.
For those looking to build a more robust review process, resources on contract compliance and invoice auditing best practices can provide useful frameworks.
The trap of deciding too quickly
When faced with a stack of guard invoices for the first time, Wilson said people tend to make one of two premature judgments. "They tend to decide either that the invoice is wrong because a number looks different from the original rate sheet, or that it must be right because the math works," he said.
Before making either call, Wilson recommends gathering the full agreement, current rate sheet, amendments, renewal terms, and any approvals that affect pricing or staffing. "The important part is establishing what the contract actually allowed during the period being billed," he explained.
He also cautioned against assuming that every discrepancy indicates improper behavior by the vendor. "Sometimes the documentation is incomplete, or the customer has an amendment sitting in another file," Wilson said. "The goal is to identify what deserves clarification and be able to show exactly why."
This perspective underscores the need for a thorough, evidence-based approach to invoice review. Rather than jumping to conclusions, reviewers should focus on gathering the necessary documentation and understanding the contractual context.
Practical takeaways for invoice reviewers
Based on Wilson’s answers, several practical steps emerge for anyone responsible for reviewing security guard invoices:
- Check for amendments and escalations first. A rate change may be legitimate if it was approved through an amendment, renewal, wage adjustment, or annual escalation.
- Verify that billed hours and fees are supported. Look beyond the math to ensure overtime was authorized, hours match service records, and fees are not already included in the contract rate.
- Gather the full contract package before judging. The original rate sheet alone is not enough; you need amendments, renewal terms, and approvals.
- Avoid assuming wrongdoing. Incomplete documentation or misplaced amendments can explain discrepancies. The goal is clarification, not accusation.
For organizations seeking to streamline this process, tools and services like those offered by VendorVariance can help support the comparison of invoices against contract terms. Additionally, general guidance on accounts payable best practices can support a more controlled invoice review workflow.
Wilson’s insights make clear that effective guard invoice auditing requires more than a calculator. It demands a thorough understanding of the contract, attention to supporting documentation, and a willingness to ask questions before drawing conclusions. By following these principles, reviewers can identify genuine discrepancies while avoiding false alarms.