Your agency says your campaigns are performing well. They send you a monthly report packed with graphs, percentages, and green arrows. Everything looks healthy.
But you have a nagging feeling. Leads are flat. Sales conversations aren’t happening. Something isn’t adding up, and you can’t put your finger on it.
Relying on the person running your ads to tell you if they’re working is like asking a student to grade their own exam. It’s a built-in conflict of interest. A proper B2B marketing audit, done independently, strips away the spin and shows you what’s actually happening.
Here is how to run your own audit without hiring a consultant or needing a marketing degree.
Why Your Agency’s Audit Is Always Going to Be Biased
This isn’t about bad agencies. Most agencies genuinely believe they’re doing solid work. The problem is incentive structure.
An agency that audits its own performance has every reason, conscious or not, to frame results positively. They pick the metrics that tell a good story. They compare to benchmarks that make average look strong. They highlight what’s working and bury what isn’t.
Think about it this way. If you asked an accountant to audit their own books, you’d laugh. If a restaurant reviewed its own hygiene standards, you’d be sceptical. But somehow, in B2B marketing, we accept self-assessment as standard practice.
Here’s what happens in most agency reporting:
- Vanity metrics lead the conversation. Impressions, reach, click-through rates. Numbers that sound impressive but don’t connect to revenue.
- Attribution gets fuzzy. “This campaign influenced 40 leads” could mean anything from a direct conversion to someone seeing an ad once three months ago.
- The baseline keeps shifting. Last quarter’s poor performance is rebranded as a “positive trend” this month.
- Bad news comes with a cushion. “This channel isn’t working” becomes “We’re still in the optimisation phase.”
It’s not necessarily a lie, but it is a filtered version of reality. At five or six figures per quarter in marketing spend, you need the raw data.
The Value of Looking at Your Marketing From the Outside
When someone with no financial stake in your current strategy reviews it, the conversation changes. Questions that an agency would never ask themselves suddenly become obvious.
An independent marketing audit asks things like:
- Is this channel actually generating revenue, or just activity?
- Are we reaching the right decision-makers, or just accumulating followers who will never buy?
- Does our messaging match what our actual customers say when they choose us?
- Are we spending money to compensate for a broken sales process?
Your agency won’t raise these. It isn’t malicious. They just won’t suggest you stop paying them for a specific service, even when it isn’t delivering.
René Spijker at Spijker & Co puts it simply: diagnose the problem before you pick a direction. Know what’s actually working before you plan next quarter’s campaigns or increase ad spend. And get that answer from someone who doesn’t profit from the status quo.
This doesn’t mean firing your agency. It means separating the roles of execution and evaluation. The people doing the work shouldn’t be the only ones grading it.
How to Run Your Own B2B Marketing Audit (Without Agency Spin)
You can do this yourself. Close the agency’s slide deck and open your own numbers.
Use this marketing audit checklist to get started.
1. Start With Revenue, Not Marketing Metrics
Pull your actual revenue data for the last 12 months. Not marketing-qualified leads. Not website traffic. Revenue.
Map it against your total marketing spend. Calculate your overall marketing efficiency ratio: total revenue divided by total marketing cost.
If your agency has been reporting fantastic results but revenue is flat or declining, you’ve already found a disconnect. Write that down. Just look at the numbers first.
2. Trace Your Last 10 Customers Back to Their Source
Pick your 10 most recent customers. For each one, answer: how did they actually find you?
Don’t rely on your CRM attribution. Call them. Send a quick email. Ask: “What made you reach out to us in the first place?”
You’ll often find that the channel your agency credits for the lead isn’t what the customer remembers. Maybe the agency says it was a LinkedIn campaign. The customer says a colleague recommended you and they Googled your name.
This one exercise usually reveals more than any monthly report.
3. Audit Your Messaging Against Actual Customer Language
Open your website. Read your homepage, your key service pages, your ads. Write down the core claims you’re making.
Now pull up five recent customer testimonials, reviews, or sales call transcripts. Write down why customers say they chose you.
Compare the two lists. If your marketing says “We drive digital transformation for B2B enterprises” but your customers say “They helped us figure out why our leads dried up,” you have a messaging gap. Fix this before you spend another euro on ads.
4. Review Every Active Marketing Channel Against One Question
For each channel you’re currently spending money or time on (LinkedIn, Google Ads, email, content marketing, events), ask one question: in the last 90 days, how many of our new customers came directly from this channel?
Not leads. Not MQLs. Customers.
Any channel that can’t point to at least one paying customer in the last quarter deserves serious scrutiny. That doesn’t mean you kill it immediately, but you should stop treating it as a given.
5. Check What Your Competitors Are Actually Doing
This isn’t about copying. It’s about context.
Look at three direct competitors. What channels are they active on? What messaging are they using? Where are they showing up that you’re not?
Then look at three competitors who are growing faster than you. What are they doing differently? Are they on platforms you’ve ignored? Are they saying something you haven’t been willing to say?
If your agency hasn’t shared competitive intelligence with you in the last six months, ask yourself why. Good marketing requires knowing the playing field. A quick LinkedIn search and 30 minutes on competitor websites will tell you more than most agency “market analysis” decks.
6. Evaluate Your Sales-Marketing Handoff
Marketing and sales need to be connected. If they’re not, you’re leaking money at the handoff.
Ask your sales team three questions:
- Are the leads coming from marketing ready for a conversation, or do they need educating first?
- What’s the most common reason prospects say no?
- If you could change one thing about the leads you receive, what would it be?
If your sales team answers these questions differently from your marketing team (or your agency), you’ve found another gap that reports won’t show you.
Start Your Audit This Week
Don’t wait for the next quarterly review. Don’t wait until you’re frustrated enough to switch agencies. Start this week with one exercise.
Open a spreadsheet. List your last 10 new customers in one column. In the next column, write down how they found you, based on what they actually told you, not what the CRM says. In a third column, note which marketing channel your agency would have credited.
Compare those two columns. The difference between what the report says and what the customer says is where your money is leaking.
If the gap is small, good. You have an honest agency or a well-tracked funnel.
If the gap is wide, you now know which questions to bring to your next agency meeting. And those questions will carry weight, since they’re grounded in real customer data rather than gut feeling.
Block two hours next Friday. Lock the door. Do this alone, with your own data, without anyone from your agency in the room. That’s the whole point of an independent audit: independence.
Frequently Asked Questions
At minimum, once a year. If you’re spending more than €5,000 per month on marketing, every six months gives you better control over performance and spend.
Yes. The real value in an audit comes from knowing your specific business and your buyers. Technical marketing knowledge helps, but the questions above focus on business outcomes, not platform expertise.
Yes. A confident agency welcomes external scrutiny. If your agency reacts defensively to an independent audit, that tells you something worth knowing.
A review checks performance within an existing strategy. An audit questions whether the strategy itself is the right one.
When your internal audit reveals gaps you can’t explain, when you’re about to make a significant investment in marketing, or when you’ve been with the same agency for more than two years without benchmarking their performance independently.
Stop Grading Your Own Homework
Agencies are incentivised to show you the green arrows. It’s your job to go looking for the red ones.
If you want an independent eye on your B2B marketing, without the spin, without the upsell, book a free marketing audit with Spijkerenco. René will tell you what’s working, what’s not, and what to do about it.
