Quick Answer: Accountants and bookkeepers who understand basic marketing KPIs can provide dramatically more value to small business clients. The marketing metrics that connect most directly to financial outcomes are: customer acquisition cost (CAC), customer lifetime value (LTV), LTV:CAC ratio, marketing spend as % of revenue, and return on ad spend (ROAS). These aren’t marketing metrics — they’re business health metrics that happen to measure marketing efficiency.
The 5 Marketing Metrics Every Advisor Should Know
1. Customer Acquisition Cost (CAC)
Total marketing spend ÷ new customers acquired in that period.
Why it matters financially: CAC determines whether a business’s marketing spend is sustainable. If CAC exceeds the gross profit from a new customer’s first purchase, the business is losing money with every new customer acquired — a financial red flag that bookkeepers are uniquely positioned to identify.
2. Customer Lifetime Value (LTV)
Average revenue per customer per year × average customer retention in years. Or more simply: average purchase value × average purchase frequency × average customer lifespan.
Why it matters financially: LTV determines the maximum defensible CAC. A business where LTV is $3,000 can afford to spend much more to acquire a customer than one where LTV is $200. Understanding LTV changes how you evaluate marketing investment decisions.
3. LTV:CAC Ratio
LTV ÷ CAC. A ratio above 3:1 is generally healthy. Below 2:1 is a warning sign — the business may be acquiring customers at a loss or unsustainably thin margin.
Why it matters financially: This ratio is one of the most reliable indicators of business health and growth sustainability. Businesses with healthy LTV:CAC ratios can invest in growth; those with poor ratios often struggle regardless of revenue growth.
4. Marketing Spend as % of Revenue
Total marketing spend ÷ total revenue × 100. Industry benchmarks vary — generally 5–15% for established SMBs, 15–25% for high-growth businesses.
Why it matters financially: You already have this data in QuickBooks. Tracking this over time reveals whether marketing investment is proportional to revenue, and whether it’s trending in a sustainable direction.
5. Return on Ad Spend (ROAS)
Revenue generated from advertising ÷ advertising spend. A ROAS of 4x means $4 in revenue for every $1 in ad spend.
Why it matters financially: ROAS helps evaluate paid advertising efficiency. However, ROAS requires connecting ad platform data to actual revenue — which requires either a tracking system or the business manually attributing sales to specific campaigns.
Frequently Asked Questions
- How do I get this marketing data for clients?
- Revenue data comes from QuickBooks. Marketing spend comes from QuickBooks expense categories. New customer count and CAC require your client to track new customers — from their CRM, POS system, or simply logging new customers. LTV requires historical data from QuickBooks on repeat purchase patterns. ROAS requires the client to connect their ad platform to their revenue data — which is where tools like Krystl help automate the connection.
Next Steps
- For your top marketing-spending clients: Calculate their current CAC and LTV using available QuickBooks data.
- Add a “Marketing Metrics” section to your client reporting template.
Help your clients connect their marketing spend to their QuickBooks results.
Krystl gives your small business clients a clear view of which marketing investments are creating revenue — connecting the financial outcomes you see in QuickBooks to the marketing decisions that drove them.
Last Updated: May 2026 | Published by DigitalSMB
