How to Calculate Your AP Financial Leakage (With a Step-by-Step Framework)
Why You Need a Number, Not a Guess
"We probably have some overpayments" is not actionable. "We estimate $1.2 million in potentially recoverable overpayments based on our vendor spend and category mix" gets a CFO's attention.
Here is the step-by-step framework.
Step 1: Segment Your Vendor Spend by Category
Break annual vendor spend into:
- Freight & Logistics
- Staffing & Contingent Labour
- Facilities Management
- MRO & Indirect
- Direct Materials
- Professional Services
Rough numbers are sufficient at this stage.
Step 2: Apply Category-Specific Leakage Rates
| Category | Conservative | Mid-Case | Upside |
|---|---|---|---|
| Freight & Logistics | 0.5% | 1.5% | 4.0% |
| Staffing & Contingent Labour | 0.3% | 1.0% | 2.0% |
| Facilities Management | 0.5% | 1.5% | 3.0% |
| MRO & Indirect | 0.3% | 0.8% | 1.5% |
| Direct Materials | 0.1% | 0.3% | 0.5% |
| Professional Services | 0.2% | 0.5% | 1.0% |
Step 3: Apply Risk Multipliers
| Risk Factor | Adjustment to Estimate |
|---|---|
| No recovery audit in last 24 months | +50% |
| ERP migration in last 24 months | +75% |
| M&A event in last 24 months | +100% |
| Major contract renewal in last 12 months | +25% |
| AP team turnover in last 12 months | +20% |
| Strong contract-level verification controls | -30% |
Step 4: Produce a Range
Apply conservative, mid-case, and upside rates to each spend category, then sum across categories and apply risk multipliers.
"Based on our $200M in vendor spend, category mix, and two recent contract renewals, we estimate $500K-$3M in potentially recoverable overpayments."
Step 5: Validate With a Pilot
Your estimate is based on benchmarks, not your actual invoice data. The only way to know your true leakage rate is to run a verification. Start with one vendor in your highest-estimated-leakage category and compare actual findings against the benchmark prediction.
Haulr can turn your estimate into an actual number in days.