First Click vs Last Click Attribution in Affiliate Marketing

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Megan is a marketing strategist and writer with 15 years of experience using content, automation, and smart marketing strategies to help businesses grow. Her background spans content strategy, lead generation, marketing automation, and communications, giving her a practical view of what it takes to turn a good idea into marketing that actually gets results. She enjoys working across both digital and traditional marketing and loves that no two days ever look quite the same. Based in New Zealand, Megan spends her off-hours exploring new places with her family and finding the next great spot to eat.

First-Click vs Last-Click Attribution

Each model will give credit to a different partner. Should it be the partner who first introduced the customer, or the partner involved immediately before they converted? The table below identifies which stage of the customer journey each model focuses on:

	First-click attribution	Last-click attribution
Credit goes to	The first tracked affiliate interaction	The final tracked affiliate interaction before conversion
Primary focus	Discovery and customer introduction	Conversion
Prioritizes	Content publishers, creators, influencers and review sites	Coupon, cashback and loyalty partners
Advantage	Recognizes partners that introduce customers to the brand	Simple to track and closely connected to the final purchase
Limitation	Can ignore partners that helped move the customer toward conversion	Can undervalue partners that created awareness or consideration
Risk	Over-crediting discovery	Over-crediting the final interaction

Both models depend on the cookie window, the period after a click during which a sale can still be credited to that affiliate. Cookie windows are set by the brand and commonly range from 1 to 90 days, with 30 days being a typical default. A sale that happens after the window closes isn’t credited to that affiliate under either model.

The real difference between the two models shows up when a second affiliate gets involved. Under last-click, each new affiliate click inside the cookie window overwrites the previous one, so the most recent partner takes the credit. Under first-click, the original cookie holds, and later affiliate clicks don’t replace it until the window expires. That’s why the same sale can be credited to a content creator under one model and a coupon site under the other.

So even though the difference on face value is simple, your reporting could be askew as it can give you a different idea of who your strongest partners are. This could influence your strategy incorrectly as you’d most likely increase commissions and prioritize partners that don’t add the most value.

What is first-click attribution?

Going back to the earlier example, a particular customer could take a few actions before making a purchase. Under a first-click affiliate attribution model, the creator who originally introduced her to the brand receives the credit.

The logic behind first-click attribution is that the partner who introduced the customer deserves recognition for starting the journey. Without that initial discovery, the customer may not have reached the later stages of consideration and conversion.

If you have a relatively ‘young’ brand or customer acquisition and discovery is important to your strategy then the first-click attribution model would work well. You’re recognizing the partner responsible for starting the journey.

However, there is a slight limitation to be aware of. What if the awareness was created but another publisher did more work in order to convince the customer to convert? That doesn’t seem fair. The first-click attribution model tells you where the journey begins but it doesn’t tell you what happens after.

This model benefits partners that operate in the first two levels of the funnel such as;

Content creators and influencers
Bloggers
Review and comparison websites
Editorial content

First click gives us useful information about discovery, but it still gives 100% of the credit to one moment in a potentially much longer journey.

What is last-click attribution?

This model is flipped. In the same scenario we used earlier, a coupon publisher would receive credit for the sale. This model is the default attribution model on most major affiliate networks, including Impact, CJ, Awin and Rakuten Advertising, though many platforms let programs adjust the rules. It’s the most common affiliate model approach because it’s the easiest to track… there is a direct connection between the click and the transaction. The tradeoff is that every interaction before that final click goes unrecognized.

Partners that are closer to the decision-making stage of the funnel will benefit here. Think about;

Coupon / voucher sites
Cashback
Loyalty programs

It also comes down to consumer buying behavior. In an economy where people are counting their dollars and cents, a discount could be the deciding factor between a purchase or another competitor.

The limitation with this model is that it assumes the final interaction created the entire value of the sale. If the customer already decided to buy before searching for a coupon did the coupon publisher generate the sale or simply help convert the sale?

If you’re using that data to determine commissions and budget, you could end up investing in partners that are good at capturing existing demand while undervaluing partners that create it.

How Is Credit Assigned When Multiple Affiliates Are Involved?

When you have multiple touchpoints in your program, all of them will most likely contribute something useful to the conversion but using the models described above means you’ll have to choose which part of the journey you value the most.

It’s also important to separate attribution from influence. Attribution decides who gets credit for a conversion based on a set of criteria but it doesn’t tell you how influential each partner is in making that conversion happen.

The shorter your customer journey is, the less complicated it is. If your brand sells higher value products that take a while to work through the consideration phase and a purchase can take anywhere from a few days to a few weeks then using one of the attribution models above doesn’t make sense.

This is where multi-touch attribution makes sense.

Multi-touch attribution splits credit across several affiliate interactions instead of giving 100% to the first or last one. The most common models are:

Linear: Every tracked affiliate touchpoint receives an equal share of the credit.
Time decay: Touchpoints closer to the purchase receive more credit than earlier ones.
Position-based (U-shaped): The first and last touchpoints receive the largest shares, often 40% each, with the remaining 20% split across the interactions in between.

In affiliate programs, multi-touch is often applied through commission rules rather than a single model, for example paying a content partner a bonus when they assist a sale that a coupon partner closes.

What’s the Difference Between Attribution and Incrementality?

Simply put, attribution asks who should receive credit for a sale and incrementality asks what happens when a particular partner becomes involved.

So if a customer has added a product to their cart, finds an affiliate discount code and then makes a purchase, you can’t tell if the purchase would’ve happened with or without the code.

This is where incrementality is really effective.

PartnerCentric’s FUSE™ technology, for example, is designed to help brands look beyond attributed conversions and better understand the incremental value individual partners are contributing. That can help inform decisions around partner investment and commission structures rather than relying solely on whichever partner happens to receive attribution under the program’s existing model.

The two measurements can therefore work together. Attribution helps establish how conversions are credited, while incrementality adds context around the value partners are actually creating.

What Attribution Looks Like in Practice

Say a customer places a $120 order, and your program pays a 10% commission. That’s $12 to distribute. Before buying, the customer interacted with three of your publishers:

They read a product review on a lifestyle blog and first learned about your brand.
A week later, they watched a comparison video on a YouTube creator’s channel.
Right before checking out, they searched for a discount and clicked through from a coupon site.

Here’s who gets paid under each model:

Publisher	First-click	Last-click	Split (linear)
Lifestyle blog	$12	$0	$4
YouTube creator	$0	$0	$4
Coupon site	$0	$12	$4

Under first-click, the blog that introduced the customer earns the full $12, even though two other partners helped move them toward the purchase.

Under last-click, the coupon site earns the full $12 for the final step, while the blog that created the demand and the creator who built confidence in the product earn nothing.

Under a split model, each publisher earns $4 for its role in the journey. Some programs weigh the split differently. A position-based model, for example, might give 40% to the first and last touchpoints and 20% to the middle, which would pay $4.80 to the blog, $2.40 to the creator, and $4.80 to the coupon site.

The order and the commission are the same in every scenario. What changes is which behavior you’re rewarding, and that shapes which publishers want to keep promoting you.

Which Attribution Model Is Best for Your Affiliate Program?

It depends on your goals and your stage of growth. It’s also not a “set and forget” decision. You can adapt your attribution model as your business and goals change.

A newer brand focused on awareness and customer acquisition may want more visibility into the publishers introducing customers for the first time. In the example above, that’s the lifestyle blog, and first-click would make sure it’s rewarded. A mature program with a diverse mix of publishers may need a more nuanced view of how content creators, review sites, and coupon partners each contribute throughout the journey.

Your product matters too.

If customers typically make quick, low-consideration purchases, the journey may be short, with only one or two touchpoints, and single-touch attribution may reflect reality well enough. If you’re selling expensive or highly considered products, expect more interactions between discovery and conversion, like the three-step path above.

A multi-touch approach is generally considered fairer, but you need the right tracking tools in place to measure each partner’s contribution accurately.