How Is Customer Lifetime Value Used in Marketing?
LTV is the foundation of smart marketing investment. Learn how to use LTV to set budgets, choose channels, and evaluate campaigns.
Key Takeaways
- LTV tells you the maximum you should spend to acquire a customer
- LTV:CAC ratio drives channel selection and budget allocation
- LTV by channel reveals which channels bring in your best customers
- LTV-based bidding in paid advertising outperforms single-purchase value optimisation
LTV as the budget anchor
Customer Lifetime Value (LTV) is the foundation of rational marketing budget-setting. If you know a customer generates £240 of gross profit over their relationship with you, you can invest up to some fraction of that £240 to acquire them and still be profitable. Without an LTV estimate, marketing budgets are set arbitrarily — too much in some channels, too little in others.
Setting the CAC ceiling
A common rule of thumb is that Customer Acquisition Cost (CAC) should not exceed one-third of LTV, giving a 3:1 LTV:CAC ratio. If LTV is £240, a CAC ceiling of £80 is a reasonable starting point. This ceiling defines the maximum you are willing to bid in paid advertising or invest in sales effort per customer acquired.
LTV by acquisition channel
LTV varies significantly by acquisition channel, and this is one of the most powerful marketing insights available. Customers acquired through organic search often have higher LTV than those acquired through discount promotion. Referral-acquired customers often have higher LTV than paid social customers. Calculating LTV by acquisition cohort, tagged by channel, tells you which channels bring in your best long-term customers.
LTV-based bidding
In paid advertising platforms (Google, Meta), most businesses optimise for first-purchase conversion value. Platforms increasingly support LTV-based bidding — optimising to acquire customers with the highest predicted lifetime value rather than highest immediate purchase value. Businesses that implement LTV bidding typically see a reduction in volume but an increase in customer quality.
Payback period
CAC payback period is the time it takes to recoup the cost of acquiring a customer from the gross profit that customer generates. If CAC is £80 and the customer generates £20 gross profit per month, the payback period is 4 months. For subscription businesses, investors scrutinise CAC payback carefully — a payback period under 12 months is generally considered healthy.