Agency Retainer Margin Calculator

Retainer margin is the profit left after delivery cost, expressed as a percentage of the fee. The math is simple but most agencies skip it: take the monthly fee, subtract the cost of the hours your team puts in (hours multiplied by your blended cost rate), and divide the result by the fee. A 5,000 dollar retainer that consumes 40 hours at a 65 dollar blended cost rate costs 2,600 dollars to deliver, leaving 2,400 dollars of profit and a 48 percent margin.

The number agencies get wrong is the blended cost rate. It is not what you bill the client and it is not just salary divided by hours. It is the fully loaded internal cost per hour: salary, payroll taxes, benefits, software, and a share of overhead, divided by realistic billable hours. Use a true loaded rate and the margin you see here will match what actually lands in the bank.

Most healthy agencies target a gross delivery margin of 50 to 60 percent on retainers, which leaves room for account management, sales, and the overhead that delivery hours alone do not capture. A margin above 50 percent gives you slack for the inevitable extra requests. Between 25 and 50 percent is workable but tight, and you need to police scope carefully. Below 25 percent, a single busy month can push the account into a loss.

If the calculator shows a thin margin, you have three levers: raise the fee, reduce the hours through better process or automation, or lower your delivery cost. The worst option is to do nothing and absorb the gap, because retainers compound. An unprofitable account does not just lose money, it ties up capacity you could spend on a profitable one.