What Is Discount Allocation? Where Discounts Land

How Shopify Splits One Discount Across Items

When Shopify applies a discount, it notes each item's portion. That's the allocation, and it comes in three kinds:

Spread across items. One amount, like $20 off the order, is shared by the items it covers.
On each item. Every eligible item gets the full amount off, say $5 off each shirt.
On the reward item. In a buy X get Y deal, the saving sits on the Y item.

Spread amounts split by price, so pricier items carry more. In Liquid, Shopify's theme language, each cart item lists its shares under discount_allocations.

Don't mix this up with discount stacking, which is about how many discounts one order gets. Allocation is where each one lands.

$20 Off a Jacket and a Scarf

Example: a $20 code and one return

A shopper buys a $90 jacket and a $30 scarf ($120 total) and uses a code for $20 off the order.

Jacket's share: $90 ÷ $120 × $20 = $15. It really sold for $75.
Scarf's share: $30 ÷ $120 × $20 = $5, so it really sold for $25.

She pays $100, then returns the scarf. Her refund should be $25, not the $30 tag price. Refund $30 and she's got a $90 jacket for $70. That's $5 more than the jacket's $15 share.

Where the Money Goes Matters for Margin

Allocation shows which products paid for a deal. A discount limited to certain products only lands on those. With no limits, it spreads over the whole cart, sale items too. Discounting stuff people would buy anyway wins no new orders. It just thins your margin.

When discounts can't combine, Shopify has to pick one. Our Shopify discount priority guide explains how.

More broadly, it means how a store splits its discount budget. Growth Suite, our app, does that shopper by shopper. It only shows offers to visitors who look less likely to buy. Among them, more engaged visitors get smaller discounts. Its rules can skip items by vendor, product title or sale status, and cap the discount amount. For the why, read how dedicated buyers differ from walk-away customers.

The Myth: An Order Discount Only Changes the Total

It's easy to think $20 off the order just trims the total. It doesn't. Each item carries a share, as the scarf showed, so refunds and per-product profit should use those shares. And the split isn't even: the jacket took $15 of the $20, not $10.