Agency Charge-Out Rate Calculator

What A Charge-Out Rate Needs To Cover

An agency charge-out rate is not the same as worker pay. The client fee has to cover the worker’s gross pay, employer on-costs, paid non-billable time, supervision, recruitment, payroll, insurance, systems, training, compliance checks and the agency’s target margin. If the charge-out rate is based only on hourly pay plus a small markup, the quote can look attractive but fail once holiday, admin time and unfilled client hours are counted.

This calculator starts with gross hourly pay and turns it into an annual employment cost. It then spreads that cost across the hours that can actually be billed to clients. Utilisation is the key input: a person paid for 1,950 hours a year will not usually deliver 1,950 billable hours once annual leave, bank holidays, sickness, training, supervision and internal work are included. A lower utilisation percentage raises the charge-out rate even if pay stays the same.

Margin, Markup And VAT

The target margin input is margin on the client fee. If cost per billable hour is GBP 30 and the target margin is 25%, the fee is GBP 40, because GBP 10 is 25% of the GBP 40 selling price. That is different from adding a 25% markup, which would produce GBP 37.50 and a lower margin. This distinction matters when a finance team compares desk profitability across recruiters, consultants, support staff or contractors.

VAT is shown separately because it is not profit. A VAT-registered agency may need to add VAT to the invoice, but the VAT-inclusive amount should not be used to judge staff margin. The calculator therefore leads with the fee before VAT and then gives the VAT-inclusive view for quote checks.

Worked Example: Support Worker Agency Rate

A worker is paid GBP 18 per hour for 37.5 hours a week across 52 paid weeks. Employer on-costs are entered at 18%, overheads are GBP 6,500 a year, utilisation is 72%, and the target margin is 28%. Annual pay is GBP 35,100. On-costs add GBP 6,318, making the employment cost GBP 41,418 before overheads. With overheads included, the cost base is GBP 47,918. Billable hours are 1,404. The cost per billable hour is therefore about GBP 34.13. To reach a 28% margin, the charge-out rate needs to be about GBP 47.40 before VAT.

If utilisation falls to 60%, the cost is spread over fewer client hours and the required fee rises sharply. That does not mean the worker has become more expensive; it means idle time, travel, training or unfilled bookings are being carried by fewer billable hours. This is why agencies should test a realistic low-utilisation case before agreeing a long contract.

Rate Checks Before Sending A Quote

• Check that gross hourly pay is above the correct National Minimum Wage or National Living Wage rate for the worker.
• Use actual employer on-costs where possible, including pension, payroll costs, insurance and employer National Insurance.
• Include non-billable paid time such as holiday, training, supervision, onboarding and internal meetings in utilisation.
• Keep VAT outside margin calculations so the sales team does not mistake VAT for income.
• For contractors, umbrella workers or off-payroll roles, check status and contract terms before using an employee-style cost model.

When This Calculator Works Well

Use it for employee-style agency roles where the agency controls the pay rate, carries employer on-costs and sells staff time to a client as an hourly or day rate. It suits temporary staffing, managed service teams, field staff, healthcare support roles, admin staff, education support, industrial teams and consultancy delivery where billable utilisation can be estimated.

When You Need A Different Model

Use a specialist model for permanent placement fees, success fees, retained search, fixed-price projects, IR35 assessments, umbrella arrangements, apprenticeships, commission-only sales roles or roles with complex travel and accommodation recharges. Those cases may depend on contract risk, payment terms, replacement guarantees, statutory checks or project scope rather than a single hourly charge-out rate.