Quantity breaks & native discounts

01Choose a simple tier structure

The demo’s one-pack has no reduction, the two-pack saves 10% per unit and the three-pack saves 20% per unit. Radio cards show the pack size, effective unit price and total savings. Discounts must be based on the selected product variant’s real price and currency precision.

1. Enable quantity-break blocks on the product template.
2. Set the tier quantities to 1, 2 and 3, or a sequence appropriate for the product.
3. Choose the default tier and use factual quantity labels.
4. Keep the add-to-cart quantity synchronised with the checked radio input.

02Configure an enforceable discount

Quantity cards use actual variant prices and, when available, Shopify’s native quantity_price_breaks. The theme does not accept a percentage to invent a discounted price. Configure supported volume pricing in Shopify; other eligible discounts are shown only after Shopify applies them to the cart or checkout.

1. Define qualifying products or collections and the minimum quantity.
2. Set the reduction for the corresponding tier.
3. Review discount combinations with order, product and shipping offers.
4. Place a test order and compare the product quantity, actual cart price and checkout total.

03Price calculations and edge cases

Calculate in currency minor units, round consistently and derive pack totals from the final per-unit amount. When a variant changes, update the base price and availability before recalculating tiers. Do not offer a pack larger than available stock if overselling is disabled.

1. Test zero-decimal currencies and price rounding.
2. Check subscription selling plans; do not silently combine incompatible offers.
3. Make unavailable tiers disabled with an explanatory label.
4. Provide a fieldset legend, native radio inputs and a visible selected state.

Base unit price: $35.00
1 unit × $35.00 = $35.00
2 units × $35.00 = $70.00
3 units × $28.00 = $84.00 only when Shopify supplies a native $28 volume price

04Troubleshoot a mismatch

If the drawer or checkout price differs, inspect the actual discount allocations in the returned cart and the active discount’s qualifying rules. Check that the cart has the same variant, quantity and selling plan as the card. Clear expired codes, inspect discount combinations and test without unrelated discount apps. Never alter a displayed checkout total to conceal a mismatch.