> Documentation index: [Saleor](/llms.txt) · [This section](/api-reference/miscellaneous/llms.txt)
> Source: https://docs.saleor.io/api-reference/miscellaneous/unions/tax-source-line

# TaxSourceLine Union

No description

```graphql
union TaxSourceLine = CheckoutLine | OrderLine
```

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### Possible types

<a id="checkoutline"></a>

#### [`CheckoutLine`](/api-reference/checkout/objects/checkout-line.md)

Represents an item in the checkout.

<a id="orderline"></a>

#### [`OrderLine`](/api-reference/orders/objects/order-line.md)

Represents order line of particular order.

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### Member Of

[`TaxableObjectLine`](/api-reference/taxes/objects/taxable-object-line.md) object