CAC payback period is how many months it takes a company to earn back, through gross margin, what it spent to acquire a customer, a measure of how quickly customer acquisition spending is actually recovered.
A shorter payback period means a company can reinvest recovered cash into acquiring the next customer sooner, part of why it matters as much as the LTV-to-CAC ratio itself: two companies with the same ratio can have very different cash needs if one recovers CAC in three months and the other in three years.
Payback period is especially important for a company relying on paid acquisition channels to grow, since a long payback period means a lot of cash tied up in customers who haven't yet paid back what they cost to acquire, directly affecting how much runway growth spending actually consumes.
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