Revenue share agency contract: how a capped rev share works and when it pays for both sides

A revenue share fee means the agency receives a percentage of the brand's revenue. A media site for Shopify brands, which also lists agencies selling this model, describes two versions: a share of total revenue and a share of only the incremental revenue¹. Revenue share vs incremental revenue share is not a detail. They are different deals.

• Share of total revenue. Every order counts, including customers who would have bought through email, search for your brand name or word of mouth. The agency is paid for sales it did not cause.
• Share of incremental revenue. Only sales above what would have happened without the agency's work count. That is incrementality: the extra sales caused by the activity.

Incremental sounds fairer. It is harder to run. Someone has to define the expected level of sales and agree how to measure the gap. If the measurement is weak, the dispute moves from the invoice to the method.

Example (illustrative): Last year the shop made 100 units of revenue. This year it makes 130. A share of the full 130 also pays for the 100 that was already there. A share of the extra 30 does not. Whether the extra 30 is really extra depends on the baseline.

The same site lists base fee plus share as options and calls a base fee combined with a share of incremental revenue a common structure¹. The two parts do different jobs.

• The base pays for work that has to happen whatever the sales do: setup, tracking, reporting, creative production. Without it, the agency carries all the risk, and quick wins become tempting.
• The share links part of the agency's income to a result you care about.

A share-only deal can look attractive to a founder. Our view: it nudges the agency toward the easiest revenue, which is often the revenue that was already there. A base plus a capped share spreads the risk, so neither side carries all of it.

Revenue is easy to count. It is also not profit. A discount-heavy month can lift revenue and leave less money in the bank than a quiet one. If the share follows revenue, the agency is rewarded for volume, whatever it costs you to ship, refund or discount.

Our view: tie the share to a margin-aware KPI where you can. Our convention is contribution margin before marketing: revenue minus the variable costs that grow with every order, such as cost of goods, shipping, payment fees, returns and discounts. Sources differ on which costs they include, so a contract has to list them.

Returns need their own line. Return-adjusted ROAS is ROAS after accounting for returns. If the share is paid on revenue before returns, you pay for orders that came back.

Compare this with a fee that grows with ad spend. One agency, which sells fixed retainers, argues that a percentage of spend creates a conflict of interest². Read it as an interested view. The logic stands anyway: when the fee grows with the budget, nothing in the fee rewards efficiency.

What clauses belong in a revenue share agency contract? The same site says to agree in writing the revenue basis, the baseline, deductions, attribution rules, included costs, audit rights and exit obligations¹. It does not cover caps or returns; we add both. Our view: write each clause in plain words, with a worked example attached.

1. Baseline. The baseline is the level of sales expected without the agency's work. Every uplift is measured against it. Agree how it is set, who can change it and when it resets.
2. Revenue source. Which system counts: the shop, the analytics tool or the ad platform. Their totals often differ.
3. Cap. A ceiling on what the share can reach in a period. It keeps the fee tied to the work done. Agree whether it applies monthly, quarterly or yearly, and what happens to the excess.
4. Adjustments. How price changes, promotions, new channels, seasonality and stock problems are handled. A sale you ran on your own does not belong to the agency.
5. Returns and cancellations. Whether the share is paid on revenue before or after returns, and how a later refund is netted off.
6. Reporting and audit rights. What data the agency sees and what you can check.
7. Exit. Notice, what happens to the share on orders already placed, and who owns the accounts and data.

Your counsel decides the legal wording. The commercial questions above are yours to settle first.

It is a poor fit when:

• The baseline cannot be set. A new brand has no history. A brand in a launch or a rebrand has a baseline that is changing.
• Revenue is distorted by factors the agency does not control. Pricing, stock, marketplace changes and big promotions all move revenue.
• The scope is not about revenue. Tracking fixes, audits and measurement work do not map to a revenue share.
• You cannot report returns reliably. A margin-aware share needs clean data.

In those cases, a fixed fee for a defined scope may be simpler. Revenue share is a tool for one kind of situation, not a better default.

For the full comparison, see percentage of ad spend vs flat fee vs revenue share. For questions to put to a prospective agency, see marketing agency red flags.

• Is the share on total or incremental revenue, from which system, and from what baseline?
• Is there a cap, and over what period?
• Is the share paid before or after returns?
• What happens to the share when we run a promotion or change prices?
• What can we audit, and how do we exit?

Our view: any fee structure should be explained in writing before work starts. If it includes a share, the baseline and cap belong in that explanation too.