Credit versus causation
Attribution assigns credit for conversions to touchpoints; incrementality measures whether a channel actually caused conversions that would not have happened anyway. The distinction is the difference between correlation and causation. Attribution sees which touches were on the path and divides credit among them. Incrementality asks whether removing a channel would actually reduce conversions, which is the only question that truly justifies spend. A channel can score well on attribution and drive zero incremental revenue.The classic trap
The clearest example is retargeting. An ad shown to a buyer who was already going to purchase gets full attribution credit for the sale, yet it caused nothing, the buyer would have converted regardless.
- Attribution says the retargeting ad was on the winning path, so credit it. - Incrementality says the sale would have happened anyway, so the ad drove no lift.
Optimizing purely on attribution can pour budget into channels that shadow conversions without causing them, which is one of the most expensive mistakes in marketing ROI analysis.
Use each for its job
The two are complements, not rivals. Marketing attribution is practical and fast, right for day-to-day channel management and directional calls where running an experiment for every decision is impractical. Incrementality testing, through holdouts and controlled experiments, is the rigorous standard for the decisions that matter most: whether a large channel is genuinely worth its budget. Mature teams use attribution to manage the mix continuously and incrementality measurement to validate the big bets, because attribution tells you where conversions happened and only incrementality tells you which spend actually made them happen.
Frequently Asked Questions
What is the difference between attribution and incrementality?
Attribution assigns credit for a conversion to the touchpoints along the path. Incrementality asks a harder question: would the conversion have happened anyway without this channel. Attribution describes which touches were present; incrementality tests which touches actually caused conversions that would not otherwise have occurred.
Why is incrementality more rigorous?
Because attribution can credit a channel that was merely present, not causal. A retargeting ad shown to someone about to buy anyway gets attribution credit but drove no incremental sale. Incrementality, measured through holdout tests and experiments, isolates the true causal lift, which is what actually justifies spend.
Should you use attribution or incrementality?
Both, for different purposes. Attribution is practical for day-to-day channel management and directional decisions. Incrementality is the gold standard for big budget decisions, because it answers whether a channel is genuinely worth its cost rather than just present on converting journeys.
Put these metrics to work
ORM builds custom revenue forecast models that turn concepts like attribution vs incrementality into prescriptive action for your team.
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