A percentage-of-revenue rule treats every business the same. In practice, a service business with strong margins and repeat customers can invest far more per new lead than a low-margin business selling once. Start with your own numbers instead of an industry average.
Start With What A Customer Is Worth
Work out the gross profit on an average customer, then how often that customer returns. That figure sets the ceiling on what you can afford to pay to acquire one. If a new customer produces $600 in gross profit over a year, paying $120 to win one is a strong investment. Paying $500 is not.
- Average sale value, minus direct costs, equals gross profit per sale.
- Multiply by realistic repeat purchases to get customer value.
- Decide what share of that value you are willing to reinvest.
Work Backwards From The Goal
Once you know what a customer is worth, set the target: how many new customers do you need this year? Multiply by your acceptable acquisition cost and you have a budget tied to an outcome rather than a percentage.
This also exposes unrealistic plans early. If the target requires more new customers than your acquisition cost and budget allow, the answer is to adjust the goal, improve conversion, or raise the investment — not to hope a campaign outperforms.
Check Capacity Before You Increase Spend
Advertising that produces more enquiries than a business can answer wastes money twice: once on the media, and again on the goodwill of people who never got a reply. Before increasing budget, confirm that calls get answered, quotes go out quickly and the website makes the next step obvious.
Separate Media Spend From Management
A budget has two parts. Media spend is what platforms and suppliers receive. Management is what it costs to plan, build, negotiate and monitor the work. Keeping them separate is the only way to judge whether the media itself is performing — and it makes every proposal you receive easier to compare.
Leave Room To Test
Hold back a portion of the annual budget for testing a new channel, offer or creative approach. A business that never tests ends up renewing the same media every year by default, which is how budgets drift away from results.
A defensible marketing budget is built from customer value, a clear target and honest capacity — not a percentage someone quoted on a call.