When a billing audit pays for itself in week two
The pattern we have stopped finding surprising is the proration silently waived on plan upgrades. It happens when a feature flag in the billing platform was toggled at some point and never reviewed. The customer experience is fine. The finance impact is real and accumulates quietly.
A related pattern is taxes calculated against the wrong customer address. This usually traces back to a CRM field that was meant to be the billing address and ended up storing the shipping address. Cross-border invoices stop matching the local tax rules, and the company carries the difference until somebody notices.
Neither pattern is dramatic. Both are common enough that we now mention them in week one of every audit just to set expectations. The audit pays for itself when finance and engineering finally sit at the same table and agree on what the billing platform is actually doing.
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