The standard answer is “5 to 10 percent of revenue”, and it is close enough to be quoted everywhere and vague enough to be useless. It says nothing about whether you are growing or holding, what your margins are, or how long a customer stays with you. This is how to get to a number you can actually defend — and, more importantly, how to split it once you have one.
Key takeaways
- Holding steady: 5–8% of revenue. Growing: 10–15%. New or launching: 15–20%, funded from capital rather than revenue.
- Percentage of revenue is a sanity check, not a method. The real number comes from your customer acquisition cost multiplied by how many customers you need.
- Your website is infrastructure, not a campaign. Budget it separately — spending on ads that land on a slow, unconvincing site is the most common way small businesses waste money.
- Split roughly 60% into what is working, 30% into scaling it, 10% into experiments you are willing to lose.
- If you cannot measure it, you cannot budget it. Call tracking and form attribution cost almost nothing and change every decision that follows.
What we’ll cover
1. The benchmarks, and what they hide
| Situation | Share of revenue | Why |
|---|---|---|
| Established, defending position | 5–8% | Enough to stay visible and keep existing channels warm |
| Actively growing | 10–15% | Buying share costs more than holding it |
| New business or new market | 15–20% | No brand recognition, no referral base — every customer is paid for |
| High-margin services (agencies, professional services, software) | Toward the top of each range | Margin absorbs it; competition is fierce |
| Low-margin retail and trades | Toward the bottom | Every dollar spent is a dollar that had to be earned several times over |
Two things these ranges hide. First, they are percentages of revenue, which is the wrong denominator for a low-margin business — 10% of revenue can be most of your profit. Sanity-check against gross profit as well. Second, they say nothing about customer lifetime value. A dental practice where a patient stays eleven years can rationally spend far more to acquire one than a business selling a one-off $400 job, even at identical revenue.
2. Building the number from the bottom up
The percentage is a check. This is the calculation.
- Pick a growth target in customers, not dollars. “Twenty percent growth” is not actionable. “Eighteen new clients this year” is.
- Work out what a customer is worth. Average sale value × how many times they buy × how many years they stay, minus the cost of delivering it. This is your gross customer lifetime value.
- Decide what you are willing to pay for one. A common benchmark is a 3:1 ratio of lifetime value to acquisition cost. If a customer is worth $3,000 in gross profit, spending up to $1,000 to win one is defensible.
- Multiply. Eighteen customers × $1,000 is an $18,000 annual budget. That is your bottom-up number.
- Compare it to the benchmark. If $18,000 is 4% of revenue, you are probably under-investing. If it is 30%, either your target is unrealistic or your acquisition cost needs to come down before you spend more.
The value of doing it this way is that it tells you why the number is what it is, which means you know what to change when it stops working.
3. How to split the budget
A workable default for a small business, once you have a number:
| Bucket | Share | What goes in it |
|---|---|---|
| Proven channels | ~60% | Whatever is already producing customers you can trace. Protect this first. |
| Scaling what works | ~30% | More of the same channel, or the obvious adjacent one. SEO and content usually live here. |
| Experiments | ~10% | New channels, new formats, new audiences. Budget to lose it; some of it will pay for everything else. |
If you are new and have no proven channel yet, the split is temporarily meaningless — spend the first few months deliberately buying information about which channel works for you, then apply the split once you know.
Paid versus organic
Paid advertising buys traffic immediately and stops the moment you stop paying. SEO and content take three to six months to produce anything and then keep producing at no marginal cost. Neither is better; they solve different problems. Most small businesses we work with run paid to cover the gap while SEO matures, then shift the ratio as organic starts carrying its share. If your budget is genuinely small, choose one and do it properly — a half-funded campaign in two channels beats nothing but loses to a fully funded campaign in one.
4. Why the website sits outside the marketing budget
This is the mistake that costs the most. A website is not a campaign; it is the place every campaign lands. Treating the build as marketing spend means it competes annually with advertising, which is how businesses end up driving paid traffic to a site that takes eight seconds to load and never says what it costs.
Budget it as a capital item with a three-to-four year life, the same way you would a vehicle or a fit-out. Then budget separately for keeping it alive — hosting, a care plan, and periodic content work. If your conversion rate doubles because the site actually works, every marketing dollar after that is worth twice as much, which is a better return than any channel optimisation you will run this year. Our web design pricing is published for exactly this reason: you cannot plan a budget around a number nobody will tell you.
5. What things actually cost in San Diego
| Item | Typical San Diego cost |
|---|---|
| Custom small-business website (capital) | $6,000–$7,500 one-off |
| Hosting and care plan | $90–$360 / month |
| Local SEO retainer | $750–$3,000 / month |
| Google Ads management fee | $500–$1,500 / month, plus ad spend |
| Google Ads spend, local services | $1,000–$5,000 / month to be competitive |
| Social media management | $800–$2,500 / month |
| Content: one researched article | $300–$900 |
| Brand identity | $2,800–$12,000 one-off |
| Professional photography, half day | $800–$2,000 |
| Email marketing platform | $20–$150 / month |
Two notes on the ads line. The management fee and the ad spend are different things, and any proposal that blurs them is worth questioning. And in competitive San Diego categories — legal, dental, home services — a Google Ads budget under about $1,000 a month tends to buy too few clicks to learn anything, which makes it worse value than spending nothing.
6. Where small businesses waste it
- Spreading a small budget across five channels. Nothing gets enough to work, and you learn nothing about any of them.
- Paying for traffic to a site that does not convert. Fix the destination before buying more visitors.
- Retainers with no defined deliverables. If the contract does not say what gets published or fixed each month, you are buying reports.
- Rebuilding the brand instead of finding customers. Brand work matters, but it is rarely the binding constraint on a business that needs revenue this quarter.
- Cancelling SEO at month four. It is a three-to-six month investment by nature; stopping at month four means paying the entire cost and collecting none of the return.
- No call tracking. Without it, half your results are invisible and you will cut the channel that was working.
7. Measuring it properly
You need four numbers, reviewed monthly:
- Cost per lead, by channel. Total spend on that channel divided by leads it produced.
- Lead-to-customer rate, by channel. Cheap leads that never close are not cheap.
- Customer acquisition cost, by channel. The first two combined. This is the number that decides where next quarter’s money goes.
- Payback period. How many months until a customer has repaid what you spent to acquire them. Under twelve months is comfortable for most small businesses; over eighteen constrains how fast you can grow.
The infrastructure for this is cheap: a call tracking number per channel, form submissions tagged with their source, and a single field in whatever you use to track jobs recording where the customer came from. Add “how did you hear about us?” to your intake and actually record the answer — it catches the word-of-mouth and offline effects that analytics will always miss.
FAQs
What percentage of revenue should a small business spend on marketing?
Five to eight percent of revenue if you are established and defending your position, ten to fifteen percent if you are actively trying to grow, and fifteen to twenty percent for a new business with no referral base — funded from startup capital rather than from revenue that does not exist yet. Treat those as sanity checks rather than as the method. For a low-margin business, check the figure against gross profit too, because ten percent of revenue can quietly be most of your profit. The number that actually matters is built from the bottom up: how many customers you need, what one is worth over their lifetime, and what you are therefore willing to pay to acquire one. If that calculation and the benchmark disagree sharply, one of your assumptions is wrong and it is worth finding out which.
Should I spend on SEO or Google Ads first?
If you need customers this month, ads. If you can wait a quarter, SEO gives you a better long-run cost per customer. Ads buy traffic immediately, let you test which messages and services actually sell, and stop producing the day you stop paying. SEO takes three to six months to show meaningful movement and then keeps delivering at no marginal cost per visitor, which is why the economics improve every month you stay with it. The common sequence for a small business is to run modest paid campaigns to cover the gap while SEO matures, then shift the ratio as organic traffic starts carrying its share. What does not work is funding both at half strength: in a competitive San Diego category that usually buys too little of either to learn anything reliable from.
Is a website part of the marketing budget?
Budget it separately, as a capital item with a three-to-four year life, in the same category as a vehicle or a shop fit-out. A website is not a campaign; it is the place every campaign lands. When the build competes for the same annual pot as advertising it tends to lose, and you end up paying for traffic that arrives at a slow, unconvincing site — which is the single most common way small businesses waste marketing money. What does belong in the ongoing marketing budget is what keeps the site working: hosting and a care plan, new content and landing pages, and periodic conversion improvements. It is also the highest-leverage line item you have, because doubling your conversion rate doubles the value of every marketing dollar you spend afterwards.
How long before marketing spend pays for itself?
Paid advertising can produce enquiries within days, but judge it over ninety days rather than ninety hours — the first month is mostly buying data about which keywords, audiences and messages work. SEO and content typically show early signals at two months, meaningful ranking movement at three to six, and a compounding return after that. Brand and reputation work pay back over years and resist clean attribution entirely. The number worth tracking is payback period: how many months until a customer has repaid what you spent acquiring them. Under twelve months is comfortable for most small businesses. Beyond eighteen, growth becomes cash-flow constrained, because you are funding acquisition long before the revenue arrives — which is a financing problem rather than a marketing one. If you do not know your payback period today, calculating it is the highest-value hour you will spend on marketing this quarter.
How do I know if my marketing agency is worth the money?
Ask for three things and judge the answers. First, what specifically will be published, built or fixed this month — a retainer with no named deliverables is a reporting subscription. Second, what the cost per lead and cost per customer is by channel, not just impressions, clicks and rankings, which can all improve while enquiries do not. Third, what they would stop doing if the budget were cut by a third; a good answer shows they know which activities are actually producing. Then check that management fees and ad spend are itemised separately, because blurring them hides the real cost of the service. Give any channel a fair window before judging it — ninety days for paid, six months for SEO — but expect clear reporting from month one. An agency that cannot tell you which channel produced your last ten customers is not measuring the thing you are paying them to improve.
Written by the Lenzit team in San Diego. We plan and run marketing for San Diego small businesses, and build the websites it all depends on. See advertising & marketing or book a call.
