Last-Click Attribution
Definition
An attribution model that gives 100% credit for a conversion to the final marketing touchpoint before the customer converted.
What is Last-Click Attribution?
Last-click attribution assigns all conversion credit to the final channel a visitor interacted with before converting. If someone clicked through from an email and bought something, the email gets 100% of the credit – even if they originally found you through Google.
For years, this was the default model in most analytics platforms because it's simple to track and understand.
Why Last-Click Was Popular
Last-click attribution is straightforward. There's no complex modelling, no splitting credit, no ambiguity. The last touchpoint before conversion gets all the credit.
It's also the easiest to track accurately – you know what brought someone to the conversion page.
The Problems with Last-Click
Last-click systematically undervalues awareness and nurturing channels:
It Ignores the Journey
A customer might have seen 10 touchpoints before converting. Crediting only the last one ignores the work that built up to that moment.
It Favours Closing Channels
Brand search, remarketing ads, and email tend to get outsized credit because they often appear at the end of journeys. Meanwhile, discovery channels that introduced customers look ineffective.
It Leads to Bad Decisions
If you cut "underperforming" awareness channels based on last-click data, you might starve the top of your funnel. Fewer people discover you, and eventually even your closing channels suffer.
When Last-Click Works
Last-click is reasonable for:
- Simple, short customer journeys (one visit to conversion)
- Direct response campaigns with immediate action
- Quick comparisons when you need simple data
Moving Beyond Last-Click
Modern analytics platforms like GA4 now default to data-driven attribution, which uses actual conversion patterns to distribute credit more accurately. If you're still relying on last-click, consider whether it's giving you the full picture.