The One Ratio That Tells You Whether to Hire That Ad Agency

The One Question to Ask Before You Sign

If you're a contractor thinking about hiring an ad agency, there's one question you need to ask before you sign anything:

"For every dollar I spend with you — consulting, ad spend, admin time, all of it — how much revenue does that produce for clients in my industry?"

Not a vague answer. Not "it depends." A number. A ratio.

If they can't give you one, walk away. If they give you one, you need to know whether it's good enough. That's what this post is about.

The Framework Most Business Owners Have Never Seen

Alex Hormozi recently laid out a framework that finally puts specific numbers on what I've been telling clients for years. The required LTV:CAC ratio — the minimum return you need on every dollar of customer acquisition cost — depends on how many human touchpoints are involved in your business model.

Here's the breakdown:

Human Touchpoints	Min Ratio	Business Model Example
0 Humans	3:1	Paid ads → Checkout → Software delivers. Fully automated. About 5% of businesses qualify.
1 Human	6:1	Ads → Salesperson closes → Software delivers. One layer of human inconsistency doubles the ratio.
2 Humans	9:1	Ads → Salesperson books → Crew delivers. This is where most trade contractors live.
3 Humans	12:1	Manual outreach → In-person sales → Custom service delivery. Everything is human-driven.

That word — minimum — matters. These aren't targets. These are the floor. Below these numbers, you're spending into a loss.

Why the Old 3:1 and 4:1 Benchmarks Were the Bare Floor

In the original version of this post, I shared that an owner-operator with recurring revenue needs at least a 3:1 ratio on ad spend, and a business with employees doing the labor needs at least 4:1.

That was true — and it's still true as an absolute survival minimum. Here's the math:

• $1 goes to overhead
• $1 goes to labor
• $1 goes to client acquisition cost

At 3:1, you break even in year one. The only way you make money is if the client comes back for year two. Which means your service has to be good enough to earn repeat business.

At anything below 3:1, every new client you acquire costs you money. I've watched that play out hundreds of times across thousands of tax returns. It leads to cash crunches, then debt, then worse.

But here's what Hormozi's updated framework makes explicit: 3:1 was always the ratio for a business with zero human involvement. A SaaS product. A digital download. Not a plumber answering the phone and sending a tech to someone's house.

For the way most contractors actually operate — with a salesperson and a service crew — the real minimum is 9:1.

That's a fundamentally different number. And it explains why so many contractors who "tried advertising" concluded it doesn't work. They were measuring against the wrong benchmark.

What This Means for Hiring an Ad Agency

When an ad agency pitches you, they'll often talk about cost per lead. Maybe they'll mention ROAS — return on ad spend. Those numbers are incomplete.

What you need is the all-in ratio: total revenue generated divided by total cost of acquisition, including the agency's fees, the ad spend itself, your team's time handling leads, and the cost to close and fulfill.

Then you need to compare that ratio against the right benchmark for your business model.

If you're an HVAC company running paid ads through a call center that books appointments for your techs — that's two human touchpoints. You need 9:1.

If you're a roofing company doing door-to-door canvassing, in-home sales presentations, and full crew installations — that's three human touchpoints. You need 12:1.

If the agency can't demonstrate that their clients in your industry hit these ratios, they're not the right agency. Period.

The Dirty Secret Behind "Advertising Doesn't Work"

I've processed over 100,000 tax returns in 25 years. Most small business owners spend almost nothing on advertising. When you ask them why, they say the same thing: "It doesn't work."

They're not wrong about the outcome. They're wrong about the diagnosis.

The problem was never that advertising doesn't work. The problem is twofold:

First, they didn't extract enough revenue per dollar of ad spend because they were benchmarking against the wrong ratio — or no ratio at all.

Second, their service wasn't good enough to generate repeat business. And without repeat business, even a perfect first-transaction ratio won't save you, because your LTV collapses to a single transaction.

That's the real secret behind successful marketing for service businesses: your service has to be good enough that clients come back in year two. That's how LTV compounds. That's how the ratio starts working in your favor. That's the only way this works.

Try It Yourself

We built an interactive calculator based on Hormozi's framework at mozi-rules.vercel.app. Select where humans are involved in your business — attraction, conversion, delivery — and it tells you exactly what ratio you need.

Then compare that to what your current marketing is actually producing.

If you want us to run these numbers against your real P&L, book a CFO diagnostic. We'll map the LTV:CAC framework to your actual data and tell you exactly where you stand.