Contracted CAC Payback Period

What it measures

The months of gross profit from new contracted bookings needed to cover the sales-and-marketing spend that won those customers. It uses revenue committed at contract signature (New CMRR) rather than revenue recognized in the period, and it applies gross margin so you measure profit recovered, not headline revenue. This is the payback view for businesses run on bookings and ARR rather than recognized P&L revenue.

Why it matters

Your CFO and board care about payback because it tells you whether acquisition spend pays for itself, and how fast. Contracted payback reflects bookings reality — what sales actually closed and what you can forecast — rather than the slower drip of recognized revenue. Use it when you manage the business on billings, bookings, and ARR. Faster payback means capital recycles into the next quarter's growth sooner and the company carries less cash-generation risk; slow or rising payback means you are buying growth you cannot afford.

How to read it

Read this as "months to break even on acquisition spend, using booked new revenue." If payback is 11 months, the gross profit from the new bookings you won this period covers their CAC after about 11 months of those customers staying and paying. Lower is better — a 7-month payback recovers capital faster and de-risks cash than a 14-month one. Compare it to live-MRR payback (CACPP-MOM): if contracted payback is faster, you are recognizing revenue slower than you booked it, which is normal for annual or upfront-billed deals. Watch the trend — a rising number means CAC is climbing, New CMRR is shrinking, or gross margin is compressing, and all three are red flags.

What good looks like

Watch-outs

• Forgetting the gross margin factor. CAC / New CMRR is only the first step; you must divide by Gross Margin % to count profit recovered, not headline revenue. At 60% margin payback is materially longer than at 80% — slipping margins quietly stretch your true payback.
• Confusing bookings with cash. New CMRR is a monthly run-rate, not cash collected. A $120K three-year deal is about $3.33K/month of CMRR, not $120K in month one. Use CMRR for payback and a separate billing schedule for cash-flow forecasting.
• Comparing contracted to live payback without context. Both are stated in months but use different numerators. A rising contracted payback with a stable live payback usually means your billing terms are lengthening or upfront payment is slowing — diagnose the root cause.
• Ignoring cohort churn. Payback of 11 months only holds if customers stay 11 months. If annual churn is 40%, many customers are gone before payback completes — always cross-reference payback against net and cohort retention.

Worked example