Pay per lead marketing buys defined inquiries rather than paying customers. Compare billed leads, accepted leads, credits, selling costs, wins, and customer contribution using one reconciled cohort.
Pay per lead marketing charges a business for defined inquiries rather than completed sales. Judge the arrangement by the cost of accepted leads, the customers those leads become, and the contribution those customers generate. The quoted lead price is only the first line of the calculation.
The contract should define a billable lead: the required contact information, relevant service or product, territory, duplicate policy, and any exclusivity terms. Keep that contractual definition separate from your sales team's definition of an accepted prospect. A billable inquiry can satisfy the supplier's terms without becoming a good opportunity for your business.
For a concrete example of the charging distinction, Google's Local Services Ads documentation says advertisers pay for valid leads and describes contact events that can qualify. It does not define a lead as a completed customer sale. Other agreements need their own reading; do not copy a platform's rules into an unrelated supplier contract.
This is a buyer-economics review. The finance question is whether a purchased cohort produces enough customer contribution after qualification and selling costs. The general customer acquisition cost calculation owns the broader formula; here, the task is to build the bridge from purchased inquiries to that customer denominator.
Start with one row per supplied lead. Include supplier lead ID, delivery date, source, billed amount, business acceptance status, rejection reason, credited amount, assigned salesperson, opportunity ID, and customer ID if won. Add recorded follow-up cost and customer contribution from the relevant finance exports.
Do not divide this month's lead invoice by this month's new customers unless the customer records really belong to those leads. Tag a delivery cohort and follow it through a stated cutoff. Open opportunities should stay visible rather than being treated as final losses.
The marketing owner reconciles delivery volumes and disputes. Sales operations owns duplicate resolution, acceptance, and win status. Finance confirms supplier credits, loaded selling costs, and the contribution definition. One owner should approve the combined report so that an accepted lead does not mean different things in different departments.
Consider an illustrative US commercial-services company. The two source cohorts below are fully worked through, and every won customer has completed its first 12 months. Contribution is recorded revenue less the agreed delivery and service costs, before these acquisition costs and central overhead.
For this example only, every rejected lead received a full credit at its quoted price. That is an explicit assumption, not a promise about supplier refund policies.
| Measure | Source A | Source B | Total |
|---|---|---|---|
| Billed leads | 300 | 200 | 500 |
| Quoted lead price (USD) | 40 | 55 | — |
| Gross charges (USD) | 12,000 | 11,000 | 23,000 |
| Rejected and credited leads | 60 | 20 | 80 |
| Credits (USD) | 2,400 | 1,100 | 3,500 |
| Net lead spend (USD) | 9,600 | 9,900 | 19,500 |
| Accepted leads | 240 | 180 | 420 |
| Sales follow-up cost (USD) | 3,600 | 2,700 | 6,300 |
| Total acquisition cost in scope (USD) | 13,200 | 12,600 | 25,800 |
| New paying customers won | 24 | 36 | 60 |
| First-year contribution before acquisition (USD) | 18,000 | 21,600 | 39,600 |
The sequence matters. First subtract credited rejections from billed leads to reach accepted leads. Then subtract recognized credits from charges, add follow-up cost, and divide by the appropriate outcome.
| Calculated measure | Source A | Source B | Total |
|---|---|---|---|
| Net spend / accepted lead (USD) | 40.00 | 55.00 | 46.43 |
| Acquisition cost / accepted lead (USD) | 55.00 | 70.00 | 61.43 |
| Wins / accepted leads | 10.0% | 20.0% | 14.3% |
| Acquisition cost / new customer (USD) | 550.00 | 350.00 | 430.00 |
| Contribution less acquisition cost (USD) | 4,800 | 9,000 | 13,800 |
Dollar ratios are rounded to two decimals and rates to one decimal. For Source A, net spending is 12,000 - 2,400 = $9,600; acquisition cost in scope is 9,600 + 3,600 = $13,200. Dividing by 240 accepted leads gives $55.00, while dividing by 24 customers gives $550.00.
Source B has the higher lead price but the lower acquisition cost per customer. Its accepted-lead win rate is higher, and it produces more total contribution after acquisition spending. The total customer cost is 25,800 / 60 = $430.00; do not average the two source-level customer costs.
The volume bridge must close: 500 billed leads equal 80 rejected leads plus 420 accepted leads. Every accepted lead needs one disposition at the cutoff. A won opportunity must map to a new customer rather than a second contact at an already counted account.
The cost bridge must also close: $23,000 of gross charges less $3,500 of credits equals $19,500 of net lead spend. Adding $6,300 of follow-up cost produces $25,800. Reconcile that to the selected supplier and payroll-cost records without counting the same selling time twice.
Check credit statements as well as invoices. Google's automated lead-credit documentation notes that an original lead charge can remain on the invoice even when a credit is applied to the account balance. A business rejection and an accounting credit need separate evidence.
Finally, reconcile the $39,600 of contribution to the customers and observation window in the cohort. Gross profit margin explains the goods-cost boundary; customer contribution may subtract additional service costs. Use the same boundary for both sources before ranking them.
The first action may be better qualification or faster follow-up, rather than a different supplier. Hold Source A's acquisition spending at $13,200 and change only wins from 24 to 36. Its accepted-lead win rate becomes 36 / 240 = 15.0%, and acquisition cost per customer becomes $366.67. That sensitivity identifies what sales improvement would have to deliver; it is not a forecast.
Keep later service costs visible through customer lifetime cost. A source can look strong at acquisition and still attract accounts that require expensive support. Use cost per action when the immediate question is inquiry production, then move to customers and contribution before increasing the budget.
Covirage is not affiliated with Google.
Bring your lead-delivery, supplier-credit, opportunity, and customer-contribution exports with the cohort and cost boundaries stated. Covirage maps the columns, its tools compute and check the lead-to-customer economics, and the external AI model explains the results with every figure traced to its rows. Create a free Covirage account and bring a sample of your own data.
See customer profitability for the contribution questions that follow the lead purchase.
No. A lead is an inquiry or prospect meeting the agreed criteria; a sale is a later customer outcome. Your business usually still bears qualification and selling work. Match lead records to customer records to see what the purchased inquiries actually produce.
Remove rejected leads from the accepted-lead denominator. Reduce spending only for credits actually recognized under the agreement. A sales rejection does not automatically mean the supplier owes a refund, so keep billing status and business acceptance status in separate columns.
Identify them separately from exclusive leads and compare their accepted-lead win rate, selling effort, and contribution over the same observation period. A shared lead is not automatically uneconomic. The question is whether the customers it produces justify the total cost your business incurs.