Why Invoice Matters in Recruitment

An invoice is not an administrative formality in staffing. It is the mechanism through which the firm converts completed work into revenue, and its accuracy, timing, and terms directly affect cashflow. A permanent placement fee that takes 45 days to invoice because of missing candidate start date confirmation costs the firm six weeks of working capital on that transaction. Across a desk billing £500,000 annually, poor invoicing discipline can create a persistent cashflow gap that restricts the firm's ability to fund payroll, contractor payment runs, or growth.

In contract and temporary staffing specifically, invoicing runs weekly or bi-weekly in most markets, covering contractor hours at the agreed charge rate. The invoice must accurately reflect timesheet data, any approved overtime, and the correct VAT or tax treatment. An error that requires a credit note and re-invoice can delay payment by 30 days or more with some clients, and in the US market, incorrect invoices submitted to large enterprise accounts with automated PO-matching systems are often rejected outright rather than queried.

How Invoicing Works in Staffing

Invoicing in staffing firms takes three forms depending on the placement type.

For permanent placements, the invoice is typically raised when a start date is confirmed, for the agreed placement fee. The fee structure varies: contingency recruitment invoices on start date, retained search invoices in two or three stages (retainer on engagement, shortlist delivery, acceptance). Payment terms in the UK market typically run 30 days from invoice date; in the US market, 30 to 60 days is common for enterprise clients, though smaller clients often pay faster. Rebate provisions, where the fee is partially refunded if the candidate leaves within a defined period (typically 8 to 12 weeks), should be reflected in the invoice terms and the firm's revenue recognition accounting.

For contract and temporary placements, invoices are generated weekly from approved timesheets. The charge rate (the rate billed to the client) is always higher than the pay rate (the rate paid to the contractor or temporary worker), with the margin covering the firm's operating costs and profit. Invoices in this model are high-volume and lower-value individually, which makes automated invoicing from the timesheet system essential. Manual invoice generation at scale introduces errors and delays that compound quickly across a large book of business.

For retained or project-based work, invoicing follows milestones defined in the contract. A search firm retained to fill six director-level roles might invoice 30% on engagement, 30% on shortlist delivery per role, and 40% on placement per role. These milestones must be tracked and invoiced promptly at completion; missed milestone invoicing is a common cashflow leak in boutique retained search firms.

Payment terms and credit control are a direct function of invoicing discipline. Firms that invoice accurately on time, with the correct purchase order references, correct legal entity names, and correct VAT registration numbers, get paid faster because their invoices move through client accounts payable systems without manual intervention. Firms whose invoices arrive late, without PO references, or with data errors create work for the client's AP team, which delays payment and often damages the relationship.

Invoice in Practice

A finance director at a 35-person staffing firm specialising in IT contract placements reviewed the firm's debtor book in Q2 and found that 22% of outstanding invoices were more than 45 days overdue. A root cause analysis showed that most delays traced to two issues: invoices raised without the client's current PO number (a requirement for two major enterprise accounts), and timesheets approved by client hiring managers who were not the same person as the accounts payable contact, creating a verification bottleneck. The firm implemented a pre-invoice checklist requiring the consultant to confirm the current PO number and the AP contact before any invoice was raised. Within one quarter, the proportion of invoices overdue beyond 45 days dropped from 22% to 8%.