The funnel, in money
| Stage | Median cost | What it is |
|---|---|---|
| Lead form open | $18.21 | Somebody tapped the form |
| Completed submission | $140.49 | Somebody actually gave you their details |
| Completion rate | 11.6% | The share who finish |
| Abandonment | 88% | The share who do not |
The panel holds 139,231 form submissions, so this is not a small-sample curiosity. The 7.7x gap between an open and a submission is the price of that drop-off, and it is paid by every account running lead gen forms.
Why 88% is higher than it looks
LinkedIn lead gen forms pre-fill from the member's profile. Name, job title, company and email arrive already typed. The entire design premise is that there is no friction left to remove. An 88% abandonment rate on a form somebody has already opened, with the fields already populated, tells you the friction is not in the typing.
Three things are more likely to be doing it. The offer is not worth an email address once the person sees what they are actually signing up for. The form asks for one field too many, usually phone number. Or the ad promised something the form does not deliver, and the mismatch is visible the moment the form opens.
There is a measurement consequence too. A form open is a real intent signal from a named LinkedIn member, and most accounts never retarget it. If 88% of your openers are walking away, that is the warmest audience in your account sitting unused.
Form or landing page? The honest comparison
The usual argument is that forms produce volume and landing pages produce quality. The panel lets us put a number on where the crossover sits. From the webinar study:
| Route | Cost per registration | Note |
|---|---|---|
| Single image to a lead gen form | $252 | The cheapest registration in the study |
| Feed ad to a lead gen form, all formats | $354 | — |
| Landing page route | — | Must convert at 7% to beat the form |
| Measured landing page conversion rate | — | 0.7% |
That is a tenfold gap between what a landing page would need to do and what landing pages in the panel actually do. On current evidence the form wins on cost per registration for low-commitment offers, and it is not close. The quality argument against forms is real, but it has to be made on downstream conversion, not on cost per lead.
And it is worth knowing the broader post-click finding: the relationship between landing page conversion rate and cost per lead is 72 times stronger than the relationship between bid and cost per lead. If you are going to use landing pages, the page itself is the whole game.
Which formats fill forms cheapest
| Comparison | Result | Base |
|---|---|---|
| Document ads vs single image, paired | 42% lower cost per lead for document ads | 76 accounts |
| Enhanced conversion bidding vs maximum lead | 62% worse | Webinar study |
| Thought leader ads added in the same campaign | +44% landing page click rate | Webinar study |
Document ads at 42% lower cost per lead, paired within account, is the most actionable number here and the most ignored. If you are running lead gen forms off single image creative and have never tried a document ad, that is the first test.
What to do about the 88%
Retarget the openers. They are a named, warm, high-intent audience you have already paid $18.21 each for. Most accounts build no audience from them at all. Only 36% of accounts in the panel run a full funnel, and this is one of the places that shows.
Cut a field. Phone number is the usual culprit. Pre-fill does not help on fields the profile cannot populate.
Match the form to the ad. If the ad sells a benchmark report and the form says "request a demo", the abandonment is not a form problem.
Test a document ad. 42% lower cost per lead, paired, 76 accounts.
Follow up immediately. Pre-filled submissions are low-commitment by design, so speed to first contact carries more weight than it does on a landing page lead.
All figures are from Kiin Labs: a panel of 1,071 B2B LinkedIn advertising accounts, $79M of spend, 22,942 campaigns, 1.34 billion impressions, 2.4 million landing page clicks and 139,231 form submissions, for the 12 months to 7 September 2026. LinkedIn Audience Network is excluded throughout. Figures are medians, not averages, because the top 10% of accounts spend 64% of the money. Where a comparison says "paired", both options ran inside the same account, so account quality cannot explain the gap.