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Suboptimal Attribution Model

One or more high-volume conversion actions in this account use Last-Click attribution despite having enough conversion volume to qualify for Data-Driven Attribution (DDA). Last-Click systematically over-credits the closing-touch and under-credits assist touches, which biases bidding toward bottom-of-funnel campaigns and away from upper-funnel traffic that actually drove demand.

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By Christopher LandaverdeCreator of AdLint · ad-tech tracking specialistUpdated

Why It Matters

Last-Click was the default attribution model for most of Google Ads' history, but it has a known limitation: it assigns 100% of conversion credit to the last touchpoint, treating every assist touch as worthless. This systematically under-credits brand awareness, prospecting, and display campaigns even when they materially drove the eventual conversion. Data-Driven Attribution uses observed account-level path data to assign fractional credit and is generally more accurate for accounts with sufficient volume. The check fires when AdLint sees a Last-Click action that has enough recent volume to be DDA-eligible. The team is leaving optimisation accuracy on the table.

How To Fix It

  1. In Tools & Settings → Measurement → Conversions, identify each Last-Click action with sufficient volume.
  2. Edit the action and change Attribution Model to Data-Driven. Google Ads will indicate eligibility status. if marked eligible, the change takes effect at the next attribution refresh.
  3. Annotate the date. Smart Bidding will re-baseline around the new attribution signal over 7-14 days.
  4. Compare campaign reports before and after to understand which campaigns gain credit under DDA (typically upper-funnel) and which lose (typically brand and remarketing).

Example

Configuration
Action: Purchase
Current model: Last-Click
Volume (30d): 412 conversions (DDA-eligible)
Recommended: Data-Driven Attribution
For Your Client Report

Google Ads conversion actions with sufficient volume to qualify for Data-Driven Attribution but still configured for Last-Click. Google's attribution documentation, DDA produces more accurate credit assignment for accounts with sufficient volume and is recommended for Primary high-volume actions. Last-Click systematically under-credits assist touchpoints. Fix: switch eligible actions to Data-Driven Attribution and re-baseline campaign reports over the following 14 days. Source: support.google.com/google-ads/answer/6394265.

Drop this paragraph into your client deliverable. Sources back to the canonical platform documentation linked below.

References

  1. [1]Google Ads. About attribution models

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