# Cart discounts and targets

A cart discount has an eligibility rule, a target, and a value.
The rule decides whether the cart qualifies.
The target decides whether the reduction applies to the total, selected line items, or shipping.

## Eligibility and target are separate

For example, a cart may qualify when its EUR subtotal reaches EUR 100.00.
A line-item target can then restrict the saving to accessories.
A qualifying cart with no matching accessory lines has nothing for that line target to discount.

A cart predicate reads the whole cart.
A line-item target predicate reads one line directly, so it starts with fields such as `product`, `variant`, or `quantity`.
See [Cart predicate language](/concepts/cart-predicate-language#line-item-target-predicates).

## Define the amount deliberately

Use an absolute money reduction or the documented relative factor.
Pair amount thresholds with a currency condition.
A threshold of `10000` has no consistent meaning across different currencies without that condition.

A code requirement, validity window, priority, or combination policy can further restrict application.
Read [Discount codes and combination](/concepts/discounts/codes-and-combination) when offers overlap.

## Display applied discounts

Read the cart, line, and shipping discount applications that correspond to the target.
Use Thor's returned totals and tax values after adding or removing a code.
Do not distribute a total reduction across lines with an independent frontend formula.

Follow [Create a discount campaign](/guides/operations/discount-campaign) for a complete fixed-amount example.