SIA (Sell-In Agreement)

Amazon & D2C glossary · Harpy Media

An SIA (Sell-In Agreement) is the commercial contract that sets the wholesale terms of a first-party relationship: baseline wholesale pricing, trade allowances, co-operative marketing contributions, return provisions, and logistics chargeback schedules.

What is SIA?

An SIA (Sell-In Agreement) is the commercial contract that sets the wholesale terms of a first-party relationship: baseline wholesale pricing, trade allowances, co-operative marketing contributions, return provisions, and logistics chargeback schedules.

It is the financial foundation of the vendor business. Every element in it moves the effective price the brand receives per unit, so the headline wholesale price is far less informative than the net position after the agreement’s deductions — and an agreement signed without that arithmetic done is an agreement whose margin was never actually known.

Why the detail decides the margin

Trade allowances and co-operative contributions are the items most often underestimated, because they are percentages applied to volume rather than lines on an invoice. On meaningful volumes they are material, and they compound with chargebacks and operational deductions to produce a net realisation well below the nominal price.

The commercial implication: negotiate with the full picture, and model the agreement at realistic volumes rather than at the numbers that make it look acceptable. A wholesale price that appears healthy can leave almost nothing after the funding stack, and the wholesale relationship then consumes the business rather than funding it.

Living with it once signed

Three habits. Track the actual deductions against the agreement monthly, because operational chargebacks drift and pricing flexibility can be used in ways the brand did not anticipate. Keep a clean record of agreed terms, since disputes are resolved on documentation. And revisit it on the annual cycle with performance data in hand, rather than reopening terms only when something has gone visibly wrong.

The agreement also shapes strategy. Where the funding stack is heavy, the case for owning more of the customer relationship — through the direct-selling channel, where margin is set by your own pricing — becomes stronger. Many brands run both deliberately, using the wholesale channel for volume and the direct channel for margin.

In practice

Before signing, a brand models the agreement at realistic volumes: wholesale price, trade allowances, co-operative contribution, expected chargebacks, and operational costs, all deducted to give the net realisation per unit. The negotiation proceeds from that figure rather than from the headline price — and the resulting terms leave a contribution the business can actually live on.

How Harpy Media helps

Vendor terms negotiation is part of our 1P work: agreements modelled at net realisation rather than headline price, deductions tracked against the contract, and channel strategy shaped by what the terms actually leave.

SIA FAQ

What is a Sell-In Agreement?

The wholesale contract between a first-party brand and the platform — covering base cost pricing, trade allowances, co-operative marketing funding, return terms, and chargeback schedules.

What is the difference between sell-in and sell-out terms?

Sell-in terms apply to goods shipped into the network; sell-out terms relate to units sold through to customers. Both appear in the funding mix and both reduce the vendor’s net realisation.

How should I evaluate an SIA?

Model the net price after every allowance, contribution, and expected chargeback, at realistic volumes. The headline wholesale price on its own tells you very little about what the relationship will actually pay.