What is the maximum CAC I can afford?
Most CAC guidance uses a generic LTV ratio. For Indian D2C, your real ceiling is set by COD, RTO and return drag before marketing even enters the picture.
"Maximum CAC" usually gets answered with a generic LTV formula — some multiple of customer lifetime value. For a lot of Indian D2C sellers, that answer is dangerously optimistic, because it skips the single biggest cost most LTV formulas don't model at all: orders that never become revenue.
The question maximum CAC actually answers
Maximum CAC is the most you can spend to acquire one order — not one sale, one order placed — and still break even, before any further marketing cost. The distinction matters because ad spend drives orders placed, and some share of every order placed cancels, comes back as RTO, or gets returned after delivery. Your ad spend already paid to generate those orders; the cost of acquiring a lost order is still a real cost.
That's why maximum CAC divides by dispatched orders, not realized sales — dividing by realized sales alone would overstate what you can actually afford.
A worked example
The maximum this seller can afford to spend per order is ₹87. If they're actually spending something like ₹150 per order on ads today — a perfectly ordinary CPA for a ₹999 fashion product — they're losing money on every single order the campaign generates, independent of how the campaign is performing on the ad platform's own metrics.
Why this isn't a budget number
Maximum CAC doesn't depend on your monthly order volume — scaling orders up or down doesn't change the per-order ceiling, because every cost line it's built from scales with order volume too. It's a unit-economics number, not a spending plan. If your actual CPA is above this ceiling, more volume makes the problem bigger, not smaller.
What to do with this
- Calculate your real maximum CAC before setting a CPA target on any ad platform.
- If your maximum CAC is negative, the problem is upstream of marketing — product cost, fees, or RTO/return rate need to change first.
- Compare your calculated ceiling against your actual blended CPA (not just the best-performing campaign) to see your real headroom.