Most marketing budgets are set by feel — last year’s number plus a little, or whatever a competitor seems to be spending. There’s a better anchor: what a customer is actually worth to you.
Customer acquisition cost (CAC) is what it costs, all-in, to win one new customer. Put it next to customer lifetime value — the profit that customer generates over the time they stay with you — and you have the only budget rule that matters: you can afford to spend up to a fraction of lifetime value to acquire a customer and still come out ahead.
Once you know that number, everything downstream gets easier. A channel isn’t “too expensive” because the clicks cost more; it’s too expensive only if its CAC exceeds what a customer is worth. A cheap channel that brings low-value customers can quietly lose money while looking efficient on a report.
This is why every Precision Profit Plan starts with your customer economics before it recommends a single tactic. We estimate what a customer is worth in your market, work back to a defensible CAC target, and then judge every channel against it, month by month. The budget stops being a guess and becomes a consequence of the math.