Contribution Margin = Gross Profit minus shipping, payment fees, transaction fees, and taxes. It's the money left after fulfilling each order — before overhead and ad spend. NetNet reports it as its own layer rather than leaving it to be derived.
For DTC brands deciding what they can afford to pay for a customer. Contribution margin is that ceiling, and true profitability starts with getting it right.
A positive CM means every order contributes to covering overhead. A negative CM means you lose money on every sale — regardless of ad spend.
CM isolates shipping and payment processing costs. If CM is low but gross margin is healthy, you have a fulfillment problem, not a pricing problem.
CM feeds into POAS (Profit on Ad Spend). Without CM, POAS can't exist — and without POAS, you're optimizing ads blindly.
Two products with very different gross margins can have completely different contribution margins once you account for fulfillment costs:
Product B is more profitable to fulfill (37% CM vs 32%) even though it has lower gross margin (45% vs 60%)
Check contribution margin with/without free shipping. If CM drops below 15%, you're funding shipping out of overhead. Not sustainable long-term.
Compare CM of discounted vs full-price orders. A 20% discount might reduce CM from 40% to 25%. Scale it only if acquisition value justifies it.
Shipping costs vary wildly by destination. NetNet shows CM by country. Maybe your US market is 35% CM but EU is only 18%.
Only scale products with positive CM that covers your fixed overhead (salaries, rent, etc.). Negative CM products drain cash faster as you grow.
Gross profit answers whether the product is priced above what it cost to buy. Contribution margin answers whether the order was worth fulfilling — which is a different question, and the one that governs almost every operational decision.
The gap between the two is where stores are most often surprised. A product at 63% gross margin can land at 41% once it carries its share of delivery, payment fees and packaging, and the size of that drop varies enormously across a catalogue because shipping cost tracks weight and volume while gross margin does not.
Two products with identical gross margins can therefore sit twenty points apart after fulfilment, and nothing in the gross margin column will ever suggest it.
What you can pay to acquire an order. Contribution margin per order minus your target profit per order is the ceiling. Without it, acquisition targets are set by instinct or copied from someone else's business.
Whether a discount works. A code that lifts volume while dropping contribution margin per order below the undiscounted baseline is buying activity rather than profit. The baseline comparison is the whole test.
Which products to push. Ranking by contribution margin rather than gross margin reorders most catalogues, and the reordering is the actionable part — the items that move down are usually the ones marketing was pointed at.
Which markets to serve. International orders frequently carry the same gross margin and materially worse contribution margin, and a single blended figure averages that away.