# Discount combinations: what stacks and what doesn’t

> Which Shopify discounts can stack: product, order and shipping classes, the Plus-only same-item rule, the 5-code limit and the calculation order.

Page: https://lintelagency.com/resources/shopify-tricks/discount-combinations

## In short

Shopify discounts belong to three classes: product, order and shipping. Every store can combine order or product discounts with free shipping, and product discounts on different items; product with order and order with order need an eligible store; two product discounts on the same item need Plus. Both discounts must allow the combination. Customers can use up to 5 product or order codes and 1 shipping code per order.

## Facts

- **Classes:** Product, order, shipping
- **Codes per order:** 5 product/order + 1 shipping
- **Automatic:** Max 25 active
- **Same item stacking:** Shopify Plus
- **Last checked:** 2 November 2026

## How to use it

1. Open each discount and, under Combinations, tick the classes it may combine with; the other discount must allow it too.
2. Check eligibility: product + order and order + order need a store without checkout.liquid customizations.
3. Test a cart with both discounts: product discounts apply first, order discounts on the reduced subtotal, shipping last.
4. If two discounts can’t combine, expect Shopify to apply the better one for the customer.

## Code

### rules.txt

```text
# Discount classes
Product discounts    specific items or collections
Order discounts      the cart subtotal
Shipping discounts   shipping costs

# Every store can combine
order + free shipping
product + free shipping
product + product (on different items)

# Eligible stores (no checkout.liquid customizations) can also combine
product + order
order + order

# Shopify Plus only
product + product on the same item

# A combination applies only if BOTH discounts allow it
Discounts > (discount) > Combinations > tick the classes it may combine with

# Limits per order
up to 5 product or order discount codes + 1 shipping discount code
up to 25 active automatic discounts (including app discounts)
combinations work on Online Store, Storefront API and POS orders

# Calculation order
1. product discounts  2. order discounts on the reduced subtotal  3. shipping
Two percentage order discounts both use the same subtotal: 10% + 20% of 100 = 30 off
If two discounts can't combine, the customer gets the better one.
```

## Limits and edge cases

- Two percentage order discounts are both calculated on the same subtotal: 10% and 20% of 100 give 30 off, not 28.
- Combinations work on Online Store, Storefront API and POS orders, not on Facebook, Instagram, Google or other external checkouts.
- Manual custom discounts (draft orders, POS) and Scripts discounts apply regardless of combination settings.
- Outside Plus, products in a Buy X get Y discount can’t get further product discounts; the best overall discount wins.

## Questions

### Can you stack discount codes on Shopify?

Yes, if each discount allows combining with the other’s class. A customer can enter up to 5 product or order codes and 1 shipping code.

### Why won’t my Shopify discounts combine?

Both discounts must allow the combination, your store must be eligible for that type, and the cart must qualify. Otherwise Shopify applies the better discount.

### Can two discounts apply to the same product?

A product and an order discount can. Two product discounts on the same line item need Shopify Plus.

### In what order are Shopify discounts applied?

Product discounts first, then order discounts on the reduced subtotal, then shipping discounts.

## Shopify documentation

- [Combining discounts](https://help.shopify.com/en/manual/discounts/discount-combinations)

## Related

- [Discount links that apply a code automatically](https://lintelagency.com/resources/shopify-tricks/discount-links)
- [Tiered volume discount by quantity](https://lintelagency.com/resources/shopify-functions/tiered-volume-discount)
- [Turn on a discount Function as an automatic discount](https://lintelagency.com/resources/graphql/function-backed-automatic-discount)
- [Do you need Shopify Plus? The features that actually require it](https://lintelagency.com/journal/do-i-need-shopify-plus)

License: MIT. Free to use in your own store and in client work.