Net LTV (sometimes called Contribution LTV)

Net LTV, or contribution LTV in the convention used here, estimates lifetime revenue minus a defined set of costs attributable to serving a customer. It adjusts gross LTV for the resources consumed by the relationship. The word “net” is not a complete specification: some organizations subtract acquisition cost as well, while others leave it outside for a separate comparison. State the cost boundary before using the number.

Define which contribution is being estimated

Start with revenue under a stated treatment of refunds and credits, then identify costs included in the estimate. These might include product delivery, hosting, payment processing and support. Costs already included in cost of goods sold must not be subtracted again. Refunds already deducted from revenue must likewise not be counted a second time. Accounting presentation and managerial contribution analysis answer related but different questions; the LTV worksheet should reconcile to its chosen definitions.

For a simple model with constant ARPU, a stable margin and a compatible expected lifetime, contribution LTV is ARPU × lifetime × contribution margin. At 50 per month, 20 expected active months and 70% margin, this gives 700. If the 70% is specifically gross margin, the result is a gross-profit LTV. It represents a broader contribution LTV only if the intended attributable costs are all inside that margin.

Consider an illustrative lifetime-revenue estimate of 1,000 after revenue adjustments. Subtract 300 of product-delivery costs to get 700. If separately attributable processing and support costs are 35 and 32 and were not already included, the contribution estimate becomes 633. The difference is caused by the cost boundary, not by a computational discrepancy. Label both quantities so they are not treated as interchangeable.

A lifetime margin can hide the timing of costs

Costs can change with tenure. Onboarding may make early months expensive, while expansion or heavy usage can make later months expensive instead. There is no universal declining cost curve. Estimate revenue and costs by period when their timing changes the decision, and account for the probability the customer remains active in each period.

For an illustrative customer who stays 20 months and generates 50 per month, assume costs are 65% of revenue in months 1–3, 40% in months 4–6, and 26% in months 7–20. Contributions are 52.50, 90 and 518 across those periods, totaling 660.50. A flat 70% margin gives 700 over the full relationship, but doubles the first three months’ contribution from 52.50 to 105. Even a modest lifetime-total discrepancy can conceal a large early-period difference.

With an acquisition outlay of 200, the flat model accumulates 35 per month and crosses 200 in month six. The staged example accumulates 142.50 by month six, 179.50 by month seven and 216.50 by month eight, so it crosses in month eight. These are contribution-payback calculations under the stated timing assumptions. Actual cash payback also depends on billing, collection and payment timing. A lifetime total alone cannot determine it.

Compare with acquisition cost consistently

For an LTV:CAC ratio, specify a pre-acquisition contribution numerator and a compatible CAC denominator, or explicitly explain another convention. Subtracting CAC inside LTV and then interpreting the ratio as if LTV were pre-CAC mixes definitions. Compare the same customer population, currency and horizon, and distinguish forecasts from realized contributions.

A ratio such as 3:1 is a heuristic used in some contexts, not a universal profitability threshold. Required returns depend on overhead, uncertainty, time to recover cash, growth costs and capital constraints. Contribution does not equal company profit: unallocated development, administration and other costs may remain. A positive customer contribution therefore does not establish that the business as a whole is profitable.

Make the forecast inspectable

Report the included cost list, forecast horizon, discounting convention and assumptions about retention, revenue and cost by tenure. Separate value already observed from the remaining forecast. If an average margin is used, explain why it represents the forecasted customer mix; a margin from surviving mature accounts may misrepresent a new acquisition cohort. Show sensitivity to plausible changes in those assumptions alongside payback when acquisition decisions depend on the result.

References

• Stripe, Customer lifetime value — estimation inputs and business interpretation