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ROI Tracking
5 min read
January 15, 2026

What Is Time-Decay Attribution and When Does It Make Sense to Use It?

Maximize your marketing ROI by understanding that recent customer interactions drive conversions most directly. Time-decay attribution is a powerful model that assigns more credit to marketing touchpoints occurring closest to a sale or lead, providing a clearer picture of what truly closes the deal. This approach helps home service businesses, from HVAC to plumbing, optimize their marketing spend by identifying and investing in the campaigns that have the most immediate impact on customer decisions. This article will explain how time-decay attribution works, when it's most beneficial for your business, and important considerations to ensure you use it effectively.

Use Time-Decay for Emergency Services with Short Decision Cycles

Time-decay attribution is most effective for home service businesses dealing with urgent customer needs, such as emergency plumbing or HVAC repairs. In these scenarios, customers typically have very short consideration windows and act quickly once they begin searching for a solution. The model accurately reflects that the final one or two marketing touchpoints are genuinely the most influential in securing the job. It helps you prioritize marketing spend on channels that directly capture immediate demand, ensuring your budget is focused on the interactions that lead directly to a booking or call.

How Time-Decay Attribution Works to Credit Recent Interactions

The time-decay model assigns credit to every marketing touchpoint in a customer's journey, but with a significant emphasis on those closest to the conversion event. Touchpoints occurring just before a sale or lead receive substantially more credit than those further back in time. This system typically uses an exponential decay function, meaning the credit assigned roughly halves for each additional week a touchpoint is removed from the conversion. This mechanism ensures that your marketing performance metrics heavily favor the most recent and impactful customer interactions.

The ROI Insights Approach

ROI Insights tracks every lead back to its source and shows you weekly channel performance, giving you the data you need to evaluate any attribution model with confidence.

Be Aware of Time-Decay's Limitations on Brand Awareness

While effective for immediate conversions, time-decay attribution can significantly undervalue early-stage marketing efforts, particularly brand awareness campaigns. If your business uses Facebook ads to build local recognition, and then converts those leads through Google Search Ads, a time-decay model will attribute almost all success to the search ad. This can lead to prematurely cutting essential awareness spending. For a comprehensive view, consider using time-decay alongside other models, like last-touch attribution, to understand the full impact of all your marketing investments.

Key Takeaway

Time-decay attribution is best for emergency service businesses with short customer journeys, but it can undervalue the awareness campaigns that started the process.

Know which channel is worth it

ROI Insights shows you channel performance so you can make smarter budget decisions.