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Agency Rebate
An agency rebate is a volume-driven payment a media owner makes to the buying agency after the fact, calculated on the agency's total booked spend across its whole client roster with that seller over an agreed period, not on any single campaign. It sits on top of the negotiated unit price as a retrospective credit tied to a volume tier or year-on-year growth target, and it belongs to the clients whose spend generated it, not to the agency.
Formula
Worked example
An agency books €40M net with a TV sales house across all its clients in the year; the agreed scale pays 3% on volume above €30M, so the seller pays the agency a total rebate of €40M x 3% = €1.2M. Client A spent €4M with that same TV group, 10% of the agency's total volume, so Client A's pro-rata share is €1.2M x 10% = €120,000. If the year-end credit note to Client A shows only €40,000, the audit has found a €80,000 shortfall, a third of what was owed.
How it is used
Auditors reconcile this by pulling the agency's trading agreement with each seller (the volume scale and total booked volume) and comparing it against the credit notes or rebate ledger issued to the individual client. The recurring failure mode is agencies applying a flat blended rate to every client regardless of how much volume that client actually contributed to the tier, or netting the rebate against other trading terms (bonus airtime, data credits) so it never appears as a line item the client can trace.
The common mistake
Don't assume the headline rebate rate applies evenly to every client; it must be calculated pro-rata on that client's actual contribution to the volume that triggered the tier, and verified against a credit note, not taken on the agency's word.