Last-Touch Attribution

What Is Last-Touch Attribution?

Last-touch attribution assigns all the credit for a sale to the final channel, campaign, or touchpoint the customer interacted with before making a purchase. If a shopper first discovered your Shopify store through a TikTok ad but ultimately bought after clicking a Google Shopping ad, last-touch gives 100% of the credit to Google Shopping.

This is the default model used by most analytics platforms, including Google Analytics and most Shopify reporting tools.

How Last-Touch Works in Practice

Consider this journey for a skincare brand:

1. Week 1: Customer clicks a Meta prospecting ad
2. Week 2: Customer clicks a Google brand search result
3. Week 3: Customer clicks a retargeting ad on Instagram and purchases

Under last-touch, the Instagram retargeting ad receives all the credit. The Meta prospecting ad and Google search, which both played a role in the journey, receive nothing.

When Last-Touch Is Useful

Last-touch attribution excels when you need to:

• Optimize closing channels: Identify which campaigns are best at converting shoppers who are already familiar with your brand.
• Measure direct-response performance: Evaluate promotions, sales events, and retargeting campaigns where the goal is immediate conversion.
• Keep reporting simple: Last-touch is straightforward to implement and easy for teams to understand.

For Shopify merchants running retargeting campaigns, last-touch data helps answer: “Which ads are turning browsers into buyers right now?”

Limitations of Last-Touch

The core weakness of last-touch is that it completely ignores the discovery phase. A customer who found your brand through a $2 Facebook ad might convert through a $0.10 brand search click, and last-touch would tell you Facebook has zero value.

This creates a dangerous feedback loop: merchants cut top-of-funnel spending because it looks unproductive, which eventually reduces the pool of potential customers, which eventually reduces conversions from the “winning” last-touch channels too.

Last-Touch vs First-Touch

Neither model tells the whole story alone. First-touch attribution shows you what drives discovery; last-touch shows you what drives the final purchase. Smart merchants use both alongside multi-touch attribution to get the complete picture.

For a deeper comparison, see our guide on first-touch vs last-touch attribution.

Last-Touch Attribution in Detectly

Detectly captures both first-touch and last-touch UTM parameters for every Shopify order, so you never have to choose just one model. Your dashboard shows both sources side by side, making it easy to see which channels introduce customers and which channels close the sale.