Start With Goals, Not a Percentage
The common advice to spend a fixed percentage of revenue is a starting reference, not an answer. A business holding steady has very different needs from one trying to double in a year, and a new brand with no awareness needs to invest differently than an established one with steady referrals.
Work backwards from the goal instead. If you want a certain number of new customers, and you have a rough sense of what a customer is worth and how efficiently a channel converts, you can size a budget that actually maps to the outcome you want — rather than a number that just feels safe.
Know Your Margins and Customer Value
The two numbers that should anchor every budget decision are your profit margin and what a customer is worth over time. A business with healthy margins and high lifetime value can afford to invest more aggressively to acquire a customer, because that customer pays back over months or years.
If you don't know these numbers reasonably well, that's the first thing to fix — before increasing spend. Pouring more money into acquisition without understanding the economics underneath is how budgets feel busy but never quite pay off. A good agency will push on these numbers early, because they shape everything downstream.
Split Between Foundation and Growth
It helps to think of spend in two buckets. The foundation includes things like your website, brand, SEO, and local presence — assets you own that keep working over time. Growth includes paid search, social ads, and campaigns that drive results while you're actively funding them.
Underinvesting in the foundation is a common mistake. Paid traffic sent to a weak website or unclear brand simply converts worse, which means every dollar of ad spend works harder than it should. Getting the foundation right first usually makes the growth budget go further.
Where a Retainer Fits
Beyond media spend, there's the cost of the work itself — strategy, creative, execution, and management. With an agency this typically takes the form of a monthly retainer, separate from the ad budget you put toward platforms like Google or Meta.
CMG Media works with a select number of clients on monthly retainers as a long-term growth partner, which means the budget buys sustained, coordinated effort rather than scattered one-off projects. The right level depends on scope and goals, and an honest conversation about both should come before any number is quoted.
Key takeaways
- Skip the universal percentage — size your budget from real goals, margins, and customer value.
- Know your profit margin and customer lifetime value before increasing spend; they anchor every decision.
- Split spend between foundation assets you own and growth channels that run while funded.
- Separate media spend from the cost of the work itself; a retainer covers strategy and execution.