Audit lookback period
Audit lookback period: The audit lookback period is the historical window a licensing agreement’s audit clause permits the licensor to examine — commonly the prior one to three contract years, though the exact window is agreement-specific. It sets the ceiling on how far back a licensor can reach when an audit identifies an underpayment: errors that originated before the lookback window generally cannot be assessed, even when the underlying cause is still active.
The lookback period is distinct from how far back an error actually goes. Stale-master drift, for example, begins accruing at an amendment’s effective date and can predate the lookback window by years — the licensee’s reporting was wrong the whole time, but only the periods inside the window are recoverable. Some agreements extend or suspend the lookback when a finding exceeds a stated threshold, and some restart it on renewal. Read the clause before sizing exposure, and read it again before agreeing to an audit scope the licensor proposes.
A licensee discovers in the current contract year that a rate step-up four years ago was never applied. All four years were mis-rated, but a two-year lookback clause limits the licensor’s assessment to the most recent two contract years — which does not make the earlier periods correct, only unassessable under that agreement.
Related glossary terms
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