A manufacturing client called me frustrated. Revenue had been flat at $9M for 18 months despite significant marketing investment.
“We’re getting plenty of leads. The marketing is working. We just need to close more of them.”
I looked at the numbers and saw a different story.
The marketing wasn’t working. It was destroying value.
The Problem Most Businesses Have
Marketing is treated as a creative or tactical function. “We need leads” becomes “launch campaigns” without anyone connecting it to financial outcomes.
Here’s what I see constantly:
- Marketing spend increasing year over year
- Activity metrics improving (website traffic, leads, inquiries)
- Revenue staying flat or growing slower than marketing spend
- No one can explain the ROI
The disconnect: Marketing is measured by marketing metrics (leads, impressions, engagement). Finance is measured by financial metrics (revenue, profit, cash).
They live in separate worlds. No one connects them.
That’s expensive.
The Five Financial Metrics Every Marketing Investment Needs
1. Customer Acquisition Cost (CAC)
What it is: Total marketing and sales cost divided by number of new customers acquired.
Formula: CAC = (Marketing Spend + Sales Costs) ÷ New Customers Acquired
Why it matters: You need to know what you’re paying for each customer.
That $9M manufacturer?
- Marketing spend: $240K annually
- Sales costs (salaries, commissions, travel): $180K
- New customers acquired: 112
- CAC = $420K ÷ 112 = $3,750 per customer
Is that good or bad? You can’t tell without the next metric.
2. Customer Lifetime Value (LTV)
What it is: Total gross profit you’ll generate from a customer over the relationship.
Formula: LTV = Average Order Value × Gross Margin % × Number of Purchases × Average Customer Lifespan
Simplified version: LTV = Average1 Annual Revenue per Customer × Gross Margin % × Average Years They Stay
For that manufacturer:
- Average customer annual spend: $80K
- Gross margin: 28%
- Average customer relationship: 3.1 years
- LTV = $80K × 0.28 × 3.1 = $6,944
Now we can compare: CAC of $3,750 vs. LTV of $6,944.
Seems okay—spending $3,750 to acquire $6,944 in gross profit.
But wait.
3. LTV:CAC Ratio
What it is: How much value you get for every dollar spent acquiring customers.
Formula: LTV:CAC Ratio = Customer Lifetime Value ÷ Customer Acquisition Cost
Benchmarks:
- Below 1.0 = You’re losing money on every customer
- 1.0 to 2.0 = Barely profitable customer acquisition
- 3.0 to 4.0 = Healthy
- Above 5.0 = Possible to grow faster (you’re leaving opportunity on table)
That manufacturer: $6,944 ÷ $3,750 = 1.85:1
They’re acquiring customers at barely profitable economics. And that assumes:
- Every customer stays exactly 3.1 years (many don’t)
- They maintain 28% margin (many don’t due to price pressure)
- Operating costs to service them are covered (they’re not accounted for in gross margin)
When we dug deeper:
- 40% of customers were single-purchase only (LTV closer to $2,200)
- Another 30% stayed less than 18 months
- Only 30% were truly long-term customers with healthy LTV
Blended reality: They were losing money on 70% of acquired customers and barely breaking even on the rest.
4. Payback Period
What it is: How long until you recover your CAC from gross profit.
Formula: Payback Period = CAC ÷ (Monthly Revenue per Customer × Gross Margin %)
Why it matters: The longer the payback period, the more working capital you need to fund growth. Long payback periods make growth expensive and risky.
That manufacturer:
- CAC: $3,750
- Average monthly revenue per customer: $6,667
- Gross margin: 28%
- Monthly gross profit per customer: $1,867
- Payback Period = $3,750 ÷ $1,867 = 2.0 months
Two months to payback—not terrible.
But when 40% of customers are one-and-done, you never recover CAC on those at all.
5. Marketing ROI by Channel
What it is: Return on investment for each marketing channel separately.
Formula: Marketing ROI = (Revenue from Channel – Cost of Channel) ÷ Cost of Channel
Why it matters: Not all marketing performs equally. Some channels generate positive ROI. Others destroy value. If you only look at overall marketing spend, you miss this.
When we analyzed that manufacturer’s spend by channel:
Google Ads:
- Spend: $84K
- Revenue attributed: $340K
- Gross profit: $95K
- ROI: 13% (barely positive after channel costs)
Trade Shows:
- Spend: $112K
- Revenue attributed: $180K
- Gross profit: $50K
- ROI: -55% (massive value destruction)
SEO Agency:
- Spend: $44K
- Revenue attributed: $520K
- Gross profit: $146K
- ROI: 232% (excellent)
The revelation: SEO was generating strong returns. Trade shows were destroying value. Google Ads was marginal.
Overall marketing “worked” (generated leads and some revenue), but two-thirds of the budget was wasted or value-destructive.
What We Changed
Once we had financial clarity on marketing performance:
Immediate actions:
- Stopped all trade show participation (saved $112K)
- Cut Google Ads spend by 60% (kept only highest-performing campaigns)
- Doubled SEO investment to $88K
- Redirected $80K to sales enablement and customer retention
Refined targeting:
- Analyzed which customer segments had highest LTV
- Focused all marketing on acquiring those specific customers
- Implemented qualification criteria (minimum order size, industry fit)
- Sales team empowered to decline poor-fit prospects
Results in 12 months:
- Marketing spend down from $240K to $168K
- New customers acquired: 71 (down from 112)
- But average LTV per customer: $11,200 (up from $6,944)
- Revenue up to $10.2M
- Marketing ROI: 4.2:1 (vs. previous 0.9:1)
Key insight: They didn’t need more leads. They needed better customers acquired more efficiently.
Why Marketing and Finance Must Work Together
Here’s the pattern I see in most established businesses:
Marketing’s perspective: “We generated 450 leads this quarter, up 35% from last quarter. The campaigns are working.”
Finance’s perspective: “We spent $65K on marketing this quarter and revenue is flat. What are we getting for this money?”
Both are looking at the same investment through completely different lenses. Neither has the full picture.
What should happen:
Marketing and finance should be reviewing these five metrics together monthly:
- What did we spend on marketing?
- How many customers did we acquire?
- What’s the CAC?
- What’s the LTV of those customers?
- What’s the ROI by channel?
When marketing and finance speak the same language—customer economics—you make better decisions.
The Questions You Should Be Able to Answer
If you’re investing in marketing, you should know:
About acquisition:
- What does it cost to acquire a customer?
- Is that cost increasing or decreasing over time?
- Which channels deliver customers most cost-effectively?
About value:
- What’s the lifetime value of an acquired customer?
- How long until we recover acquisition costs?
- Which customer segments have the highest LTV?
About returns:
- What’s our LTV:CAC ratio overall?
- What’s our ROI by marketing channel?
- Are we creating or destroying value with marketing spend?
Most business owners can’t answer these questions. They’re spending tens or hundreds of thousands on marketing with no idea whether it’s working financially.
That’s not marketing. That’s expensive hope.
The Quick Audit
This week, answer these questions:
- How much did you spend on marketing last year (all in—advertising, agencies, events, salaries)?
- How many new customers did you acquire?
- What’s your customer acquisition cost? (Spend ÷ New Customers)
- What’s the average gross profit from a customer over their lifetime?
- Is #4 greater than #3 by at least 3×?
If you can’t answer these questions, you’re flying blind.
If you can answer them and your LTV:CAC ratio is below 3.0, your marketing isn’t working financially—even if it’s generating leads.
Next month:
Break down your marketing spend by channel. Calculate ROI for each channel separately.
I guarantee you’ll find that some channels are working and others are destroying value. You just can’t see it when you only look at aggregate spend.
This quarter:
Build a simple dashboard tracking these five metrics monthly. Review them with your team.
When everyone understands customer economics, decisions get better fast.
The Uncomfortable Truth
Most marketing spending in established businesses is waste.
Not because marketers are bad at their jobs. But because no one is connecting marketing activity to financial outcomes.
You launch campaigns, generate leads, stay busy—and have no idea whether you’re creating or destroying value.
After more than 25 years as a chartered accountant, here’s what I know:
The businesses that grow profitably don’t spend more on marketing than their competitors.
They spend smarter. They know their customer acquisition costs. They know their lifetime values. They kill channels that don’t work and double down on channels that do.
Marketing without financial analysis is just expensive activity.
Marketing with financial discipline becomes a profit engine.
Which one are you running?
If you’re spending money on marketing but can’t clearly explain the ROI, email me at richard@coumans.com.au. We can build you a simple framework to see what’s actually working.
You don’t need sophisticated analytics or expensive consultants. You just need to connect your marketing spend to your customer economics.
Most businesses are shocked by what they find when they finally look.
