First-click attribution is a way of crediting conversions that gives all the credit for a sale or enquiry to the first recorded interaction in the customer’s journey, ignoring everything that happened afterwards. It is also called first-touch attribution.
How first-click attribution works
Take a typical journey for a UK services business. Someone sees a Facebook ad, later finds a guide on your site through Google, joins your mailing list, and a fortnight after that clicks a Google Ads search ad and sends an enquiry. Under first-click attribution the Facebook ad receives the whole conversion. Under last-click, the Google Ads click receives it all. Nothing about the journey changed, only the rule for sharing out the credit.
That rule is what an attribution model is. First-click is the mirror image of last-click attribution: both are single-touch models that hand 100% of the credit to one interaction. Multi-touch models, including data-driven attribution, spread the credit across several.
Two limits are built in. First, the first click is only the first one your tools recorded inside their lookback window. A recommendation from a friend, a podcast mention or a visit on another device does not appear, so the model often credits whatever was second. Second, the model says nothing about which interaction actually persuaded someone.
At the time of writing (October 2026), first-click is not available as an attribution model in Google Ads or GA4. Google announced in 2023 that it was retiring it, along with the linear, time decay and position-based models, leaving data-driven and last-click options. You can still get a first-touch view in GA4 by reading conversions against the first user dimensions, such as the first user default channel group, and many CRMs store an original source field for each contact.
Why it matters
Every closing-focused report quietly undervalues the channels that introduce people. For a business with a long consideration period, such as a B2B supplier, a private clinic or a home improvement firm, the introduction often happens weeks before the enquiry, through content, social ads or PR. Look only at last-click and those channels appear to produce nothing, and they are the first to be cut when budgets tighten.
A first-touch view corrects that bias. It is not a better model, just a different lens. Used alongside a last-click or data-driven view, it shows which channels open conversations and which ones close them.
Common mistakes
- Using first-click alone to allocate budget, which overfunds awareness and starves the channels that convert.
- Assuming the first recorded touch was the real first contact.
- Comparing a first-touch figure from your CRM with an ad platform’s own conversion count and expecting them to agree.
- Not capturing the original source when an enquiry arrives, so the information is gone by the time anyone asks for it.
- Storing a first-touch cookie on every visitor without consent. Under PECR it needs consent like any other non-essential cookie.
How to act on it
Make sure every enquiry records how the person first found you. For consenting visitors, hidden form fields can carry the original UTM values into your CRM. For phone and walk-in enquiries, ask the question and log the answer in a fixed list of options rather than free text.
Then compare two views over at least a quarter: conversions by first touch and conversions by last touch. Channels that rank high on first touch and low on last touch are introducers. Judge them on the quality of the people they bring and on assisted value, not on cost per conversion alone. Setting up that two-view reporting is one of the first jobs in performance marketing, because it changes which channels look worth keeping.