Why incrementality has replaced ROAS as the measure that matters
Finance is now asking a different question, and incrementality is the only lens that answers it.
As pay per click (PPC) investment continues to increase, now consuming 15 to 25% of gross profit for a typical online retailer, the gap between reported ROAS and incremental return stops being academic. The C-suite and finance teams in particular are paying attention.
The measurement conversation has matured, and the ad platforms are leading it. Google and Meta are both promoting tooling that helps paid media teams prove real ROI and see the fuller picture beyond a single dashboard figure. Google's Modern Measurement Playbook recommends triangulating attribution, marketing mix modelling (MMM) and incrementality testing rather than relying on any one metric in isolation.
The takeaway is clear: the platforms themselves see triangulated measurement as best practice and in 2026, incrementality testing is fast becoming the standard for understanding true ecommerce ad performance.
What's changed recently is who's asking the question. It used to be marketing querying its own ROAS. Now it's finance asking for incremental revenue by channel, which is a different, less forgiving question, and a lot of reporting stacks weren't built to answer it.
We saw this play out directly with B&Q: working through what was actually driving results, rather than what the platform reported, got them +16% ROAS and +40% product visibility, on the same media budget, over twelve months. That gap between reported and real is exactly where incrementality earns its keep. It's the only lens of the three that answers what would have happened without the ad.
Recommended read: The B&Q case study: one million SKUs, none left behind.
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