Acquisition Growth

Reducing your CAC without sacrificing volume

A systematic process to audit where your acquisition spend is inefficient, identify your highest-leverage channel, and restructure spend for better returns.

6 steps

75 min total

Growth

Track progress as you complete steps

Reducing customer acquisition cost with data

Step 1 of 6

Audit your current acquisition spend

15 min

Before you can optimise, you need an accurate picture of what you are spending and where. Most founders have a rough idea of their ad spend but significantly undercount acquisition costs by excluding salaries, agency fees, and their own time.

Total Acquisition Spend = Ad spend + Agency/freelancer fees + Sales team fully-loaded cost + Tools + (Founder hours x hourly rate)

Action items

List every acquisition channel you have spent money or time on in the last 90 days

Pull the exact spend for each channel (ad accounts, invoices, payroll)

Estimate your own hours per week spent on acquisition and assign a cost

Add up total acquisition spend across all channels

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Step 2 of 6

Calculate channel-level CAC

20 min

Blended CAC is a health metric. Channel-level CAC is where the decisions are. Break your total spend and total customers down by the channel that sourced them. The differences will almost always surprise you.

Channel CAC = Channel spend in period / New customers attributed to that channel

Action items

Pull new customer counts by acquisition channel for the last 90 days

Check your CRM, analytics, or ask customers directly how they found you.

Calculate CAC for each channel: spend divided by customers

Record both the CAC and the average deal size or LTV for each channel's customers

A high-CAC channel is not automatically bad if the LTV is proportionally higher.

Important

Always compare CAC to LTV within each channel, not just CAC in isolation. A channel with a CAC of 400 producing customers with an LTV of 2,000 is better than a channel with a CAC of 150 producing customers with an LTV of 300.

Step 3 of 6

Score each channel across three dimensions

10 min

With your channel data assembled, score each channel on the three dimensions that determine where to invest more and where to cut.

Efficiency

How does the CAC:LTV ratio compare across channels? Which produces the most value per euro spent?

Scalability

Can you spend 3x more in this channel and maintain similar efficiency? Or is it already near saturation?

Payback period

How quickly does the average customer from this channel recover their acquisition cost? Shorter is better for cash flow.

Action items

Score each channel 1-5 on efficiency, scalability, and payback period

Identify your highest-scoring channel (most efficiency, most headroom, shortest payback)

Identify your lowest-scoring channel (this is the cut candidate)

Step 4 of 6

Identify your two highest-leverage optimisation points

15 min

CAC can be reduced from two directions: spending less to acquire the same customers, or converting a higher percentage of the spend into customers. Diagnose which lever applies to your top channel before you make any budget changes.

Targeting inefficiency

You are reaching the right people but spending too broadly. Narrowing targeting often reduces spend by 20 to 40% with minimal impact on volume.

Creative or message fatigue

High impression counts with declining click rates. New creative almost always reduces cost per click.

Landing page conversion rate

Traffic is arriving but not converting. A 1% improvement in conversion rate can reduce effective CAC significantly.

Lead quality mismatch

Leads are coming in but they do not qualify. The issue is messaging attracting the wrong people, not volume.

Action items

Review your top channel's cost-per-click and click-through rate trend over 90 days

Review your landing page conversion rate for the same period

Identify whether your primary waste is happening before the click (targeting/creative) or after it (landing page/follow-up)

Choose your two priority optimisations based on where the biggest waste is occurring

Step 5 of 6

Cut or reallocate inefficient spend

10 min

With your analysis complete, make the budget changes. Cut or reduce the lowest-scoring channel. Reallocate that spend to your highest-scoring channel, or to the specific optimisation tests you identified in Step 4.

Action items

Pause or reduce spend on your lowest-scoring channel by at least 50%

Reallocate that budget to your highest-scoring channel

Set up one specific test per optimisation priority identified in Step 4

One new creative. Or one landing page variant. Or refined targeting parameters. Test one variable at a time.

Patience required

Allow at least 3 to 4 weeks after making changes before evaluating results. Acquisition metrics lag behind spend changes. Cutting a channel and immediately measuring the impact will produce misleading data.

Step 6 of 6

Set a 30-day CAC target and tracking cadence

5 min

Define the number you are working toward, and the cadence at which you will track progress. A target without a review schedule is just a wish.

Action items

Set a specific CAC target for 30 days from today

Make it a 15 to 25% improvement on current blended CAC. Aggressive but achievable.

Schedule a weekly 30-minute review of channel-level CAC during the test period

Define what a successful outcome looks like before you begin

Example: reduce blended CAC from 180 to 140 without reducing new customer volume by more than 10%.

Playbook complete.

Run the Growth Audit again to see how your score has moved since you started this playbook.

Audit my score Next: Churn Diagnosis