If you have ever walked into a budget meeting with an attribution ROAS of 15 and felt the room go quiet, you already know the problem.
Attributed ROAS is structurally inflated, it counts sales that would have happened anyway.
Every smart CFO senses this, even if they do not say it directly.
The fix is not better presentation skills. It is a different metric.
This post explains what actually changes when ecommerce and omnichannel retail teams make the switch from attributed ROAS to incremental ROAS, and why it transforms both how you invest in media and how you talk to finance.
In the video below, Juha Nuutinen, Co-founder and CEO of Sellforte, walks through what actually changes when ecommerce and retail teams make the switch.
What actually changes when you adopt incrementality
Two things change when ecommerce and retail companies adopt incrementality in their marketing measurement.
The first is thinking and mindset.
When you use attributed ROAS as your main metric, what you are actually focusing on is how much credit each channel gets. Basically, what looks good in the data.
But when you move to incremental ROAS, you start to think: what are the channels that actually create demand and drive growth? It is a completely different mindset.
Attribution makes retargeting and brand search look great, because they capture existing demand really well. But if you focus on channels that create growth, you start putting much higher emphasis on upper funnel, mid funnel, brand building. That is a really important shift.
The second is how you talk internally.
When you start using incremental ROAS, the conversation with finance changes.
But if you come with a realistic number, for example an incremental ROAS of 5, the channels behind it, and how you want to shift budget, it opens up a completely new way of discussing things with finance and controlling. You can actually use these numbers in your budget plan.
💡 To understand exactly how attributed ROAS, incremental ROAS, and marginal incremental ROAS differ and when to use each one, read: ROAS, iROAS, miROAS: Choosing the Right KPI for Optimizing Media Spend
Why the gap between attributed and incremental ROAS is largest in fashion and retail?
For omnichannel retailers and enterprise ecommerce brands, the attribution gap is especially pronounced. Upper funnel media, brand awareness campaigns, TV, radio, DOOH, print catalog, and mid funnel paid social all get systematically undercredited by attribution, while retargeting and brand search absorb credit for demand those channels created.
Enterprise marketing measurement platforms like Sellforte that combine continuous marketing mix modeling with incrementality testing close this gap by giving every channel a calibrated, comparable incremental ROAS signal. That is the nhroumber that holds up with finance, that you can put in a budget plan, and that reflects what your media is actually doing.
💡 To learn more about what incrementality means and how it is measured, read: What is Incrementality in Marketing?
Do I need to replace my attribution model to adopt incrementality?
One of the most common concerns we hear from enterprise ecommerce teams is this: we have built a dynamic attribution model, it is deeply integrated into our reporting and steering processes, and we do not want to throw it away.
The good news is that you do not have to. The calibration multiplier approach, anchoring your existing attributed ROAS to incrementality-based truth through calibration factors, is exactly how Sellforte works.
It is the best of both worlds: preserve the operational benefits of your current attribution model and the campaign and ad set level granularity it gives you, while recalibrating it so it produces the same economic truth as your incrementality experiments. This is the approach outlined in Google's Modern Measurement Playbook, and it is what enterprise fashion ecommerce teams are increasingly adopting.
💡For a step-by-step guide on setting a Target ROAS that reflects true incrementality, read: How to Set a Target ROAS That Reflects True Incrementality
What is the difference between attributed ROAS and incremental ROAS?
Attributed ROAS measures total sales credited to a channel including customers who would have purchased anyway. Incremental ROAS measures only the sales your marketing actually caused, giving a more accurate number for budget planning and finance conversations.
💡To understand the methodology behind causal attribution, read: What is Causal Attribution in Marketing?
Final takeaway
Incremental ROAS is almost always lower than attributed ROAS. But it is the number your CFO actually believes, because it reflects what your marketing caused, not what it took credit for.
That is the number that holds up in a budget meeting, gets used in a budget plan, and builds long-term credibility for the marketing function.
Most enterprise ecommerce and retail teams already have the data they need to make this switch. The experiments are running. The MMM exists somewhere in the organization. What is missing is the connection between them. Calibrated, comparable incremental ROAS at channel and campaign level that everyone in the business can use. That is the gap Sellforte closes.
Sellforte unifies MMM, incrementality testing, and attribution into one always-on platform, so your team has true incremental ROAS at campaign and ad set level, not three separate measurement workstreams telling different stories.
To learn more how it works, book a demo with Sellforte.
Authors
Daria Alén is Senior Marketing Manager at Sellforte, where she builds educational programs, webinars, and events for ecommerce and DTC growth teams. She has over 10 years of marketing experience in B2B SaaS and Tech with specialization in go-to-market strategy and marketing analytics. Follow Daria on LinkedIn for more about marketing and growth.