UTM parameters can break your funnel—here's when to skip them

Traffic source tagging helps you measure campaign performance—until it fragments sessions, breaks cookies, and ruins the data you’re trying to collect.

You append utm_source and utm_campaign to every link you share, convinced that tagging discipline is what separates operators who understand their funnel from those who guess. Your analytics dashboard fills with neat rows of traffic sources, each click attributed to the email, the tweet, the Facebook ad that sent it.

Then you notice: session counts are inflated, affiliate commissions aren’t tracking, and the same visitor shows up three times in your funnel because every UTM-tagged link resets their session. The tracking parameters you added to measure performance are the same ones breaking attribution.

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