Last-click attribution is the most widely used model in ecommerce, and also the most widely misunderstood. It is not useless, and it is not evil. It is a narrow lens that is genuinely useful for some questions and dangerously misleading for others. The problem is that most platforms default to it, so most marketers end up making broad budget decisions through a lens built for a much smaller job. Here is what last-click actually does, when it is fine to rely on, and when it will quietly lead you to spend in the wrong places.
Last-click attribution gives 100% of the credit for a sale to the final click the customer made before purchasing. If someone clicks a Google ad, then later clicks a retargeting ad, then buys, last-click hands all the credit to the retargeting ad and none to anything that came before. It is simple, easy to understand, and it is the default in Google Ads, most ad platforms, and many analytics tools.
That simplicity is its appeal and its trap. It answers one question well, what was the final nudge before the sale, and then gets used to answer questions it was never built for.
Last-click is not always the wrong tool. It is reasonable in a few specific situations.
Very short, simple buying cycles. If your customers typically discover you and buy in a single session, there is not much of a journey for last-click to miss, so it approximates the truth.
Pure bottom-of-funnel analysis. When you specifically want to know what closed the sale, the final touch, last-click answers exactly that. It is a legitimate lens for evaluating closing tactics.
A quick, rough directional read. For a fast sanity check on obviously strong or obviously dead campaigns, last-click is good enough. The danger is only when you treat that rough read as the full picture.
The theme is that last-click is fine when the question really is about the last touch, or when the journey is so short there is little else to credit.
WHEN LAST-CLICK LIES TO YOU
The trouble starts when you use last-click to judge your whole marketing program, because it systematically distorts in predictable ways.
It over-credits bottom-of-funnel and retargeting. Retargeting and branded search almost always look fantastic in last-click, because they are usually the final touch. But they are often just harvesting sales that earlier touches created. Last-click makes demand-harvesting look like demand-creation.
It undervalues top-of-funnel. The ads, content, and channels that first introduce customers rarely get the last click, so last-click makes them look weak. Cut them, and you starve the funnel that feeds all those great-looking retargeting numbers.
It ignores long buying cycles. If your customers take weeks to buy across many touches, last-click credits only the final one and erases everything that did the real persuading.
It misses cross-channel and cross-device reality. The click that closes is often on a different device or channel from the one that created the customer, and last-click has no way to connect them.
Put together, judging your budget on last-click reliably pushes money toward the bottom of the funnel and away from the top, which is exactly backwards for growth. It is the mechanism behind the retargeting trap, where brands scale the channels that claim credit and starve the ones that actually create customers.
The answer is not to declare last-click evil and never look at it. It is to stop using a single narrow lens for every decision. Use last-click for the one thing it is good at, understanding the final touch, and use multi-touch attribution for everything else, especially budget allocation across the funnel.
Multi-touch attribution credits every meaningful touch across the journey, so you can see which channels create customers and which merely close them, and fund both appropriately. That is what Wicked Reports is built to do. It reconciles every channel against your real orders and follows customers across devices and time, so you see the full journey behind each sale rather than just its last step. You keep last-click as one useful view, and you stop letting it secretly run your budget. See how it works in the platform overview, or for the complete picture of how the models compare, read our guide to marketing attribution.
Last-click attribution is a fine answer to a narrow question and a terrible answer to a broad one. Use it to understand what closes sales, not to decide where your marketing budget should go. Judge your full program with multi-touch attribution reconciled against real revenue, and last-click becomes a useful tool in the kit rather than a blindfold you make decisions through.
Last-click attribution gives all the credit for a sale to the final click before the purchase, ignoring every earlier touch in the journey. It is simple and is the default in Google Ads and most analytics tools. It answers what closed the sale, but it credits none of the marketing that created the customer earlier in the journey.
Last-click is reasonable for very short buying cycles where discovery and purchase happen together, for analyzing what specifically closed a sale at the bottom of the funnel, and for a quick directional read on clearly strong or weak campaigns. It becomes misleading when used to judge your whole marketing program or to allocate budget across the funnel.
Because it over-credits retargeting and branded search, which are usually the final touch but often just harvest existing demand, and it undervalues the top-of-funnel channels that create customers but rarely get the last click. Relying on it pushes budget toward the bottom of the funnel and starves the top, which is backwards for growth.
Use multi-touch attribution for budget and program decisions, which credits every meaningful touch across the journey and shows which channels create customers versus which close them. Keep last-click as one narrow view for understanding closing touches, but reconcile your full marketing against real revenue across channels and devices to make accurate decisions.