The $100K LinkedIn Ads mistake: Audience Network left on

The mistake I keep finding

Last week I audited a LinkedIn Ads account spending $50,000 a month. I found the same thing I see far too often: LinkedIn Audience Network was turned on.

It had been running for months, eating up almost the whole budget, and driving zero meaningful conversions. Nobody had noticed, because the dashboard looked great. Cheap impressions, cheap clicks, lots of activity.

This is such an easy thing to miss, whether you manage the account yourself or work with an agency. It is not a strategy problem. It is a checkbox.

What LinkedIn Audience Network actually is

Audience Network (LAN) extends your campaign beyond LinkedIn, onto partner apps and websites. Your ad stops appearing in the LinkedIn feed next to a post from someone your buyer knows, and starts appearing as a banner in a mobile game or a news app.

It is switched on by default when you create a sponsored content campaign. That is why it is so common: you have to go and turn it off, campaign by campaign. In the Kiin Labs panel, 46% of 1,069 advertiser accounts had Audience Network on in at least one campaign during the year, and it took 8% of all spend (how to optimize LinkedIn Ads).

Why the numbers look good and the results don't

Audience Network makes your reporting look better while your pipeline gets worse. In the same accounts, single image campaigns with it switched on show a 47% lower CPM and a 71% lower cost per website click (Kiin Labs, how much LinkedIn ads cost). Those are not cheaper buyers. They are cheaper placements.

Nine of 37 accounts in the study got zero conversions from Audience Network while converting off it (Thought Leader Ads Benchmarks 2026). In Kiin's audit of 107 accounts, $274,000 had gone to the Audience Network.

So my rule is simple, and there is no hedge in it: Audience Network off, always. Every Kiin Labs benchmark excludes it for the same reason.

The 15-minute account hygiene checklist

These are the unsexy settings that silently destroy performance. Check them in this order.

1. Audience Network off. In every campaign, not just the new ones.
2. Audience Expansion off. It is often switched on when you build a campaign. It adds people LinkedIn thinks look like your audience, which pushes your targeting wider than you chose. Check it and disable it manually.
3. Audience size. I still see B2B campaigns targeting hundreds of thousands, or millions, of people. Tighten with job titles, functions, seniorities, skills and, my favourite, account lists. But do not go too narrow by accident: in the same advertiser, an audience under 30,000 pays a 32% higher CPM for no better click rate (audience targeting benchmarks), and under 10,000 burns through a full pass in about two weeks (LinkedIn audience size). Go narrow only where the precision is the point, such as an ABM list.
4. Exclusions. Remove functions you never sell to, such as investors, art and design or engineering if they are not buyers. You do this under professional demographics.
5. The demographics report. In Campaign Manager, open the demographics tab. You will often find budget going to job titles and companies outside your ICP. Use it to find and fix the leaks.
6. Daily budget and bidding. LinkedIn will suggest high daily budgets and maximum delivery. Use a manual bid instead and adjust to the pace of spend. Maximum delivery costs 103% more per click than a manual bid in the same account (maximum delivery cost). If you are spending the whole daily budget by noon, lower the bid.
7. Conversion tracking. Set up both last-touch and each-touch conversions. Last-touch shows direct results. Each-touch shows influence across the funnel, which matters for video and brand campaigns. Then tie it to the CRM (tracking LinkedIn Ads in HubSpot and Salesforce).

Check the format mix

Most underperforming accounts lean too heavily on one format. You need a mix, each doing its own job:

• Single image ads: the cheapest real visit on LinkedIn, $13.63 per landing page click at the median account (cost by ad format). Good for traffic and retargeting.
• Video ads: storytelling, education and trust at the top and middle of the funnel. Judge them on views, not clicks.
• Document ads: value-upfront plays such as templates, frameworks and guides (do document ads work?).
• Thought leader ads: credibility and personal storytelling. They build trust faster than company-page ads (the complete guide).
• Conversation ads: the bottom of the funnel, for demos, lead magnets and event sign-ups. A form inside a message completes 40.7% of the time, against 2.2% for a demo form in the feed (form completion).

If you only use one or two formats, you are leaving a lot on the table.

Check the funnel structure

The biggest thing missing from most ad accounts is a clear structure. Here is how we set it up:

Structure campaigns around intent, not format. Without it you are throwing money at random clicks. The full build is in full-funnel LinkedIn Ads for B2B SaaS, and the deeper eight-layer version of this audit is in the LinkedIn Ads audit checklist.

Final thought

If you spend anything on LinkedIn Ads, $1,000 or $50,000 a month, it is worth 15 minutes to check these settings. I have seen this $100K mistake far too often. Make sure your account is not one of them.

Campaign figures marked as mine are from Phil Ilic's own LinkedIn Ads account or audits, one advertiser, not benchmarks. Every other figure links to its source in Kiin Labs, built on $65M+ of LinkedIn Ads spend across 1,000+ advertiser accounts (medians across accounts, LinkedIn Audience Network excluded unless it is the subject, USD, 8 Sep 2025 to 7 Sep 2026). Cells with fewer than 10 advertisers are never published.

Originally published in the B2B Hero newsletter on 3 July 2025 as “The $100K LinkedIn Ads Mistake I Keep Seeing”. Edited for the web, with Kiin Labs figures added where we now have the data. Subscribe to B2B Hero.