> ## Documentation Index
> Fetch the complete documentation index at: https://docs.gobl.org/llms.txt
> Use this file to discover all available pages before exploring further.

# Set

Set defines a list of tax categories and their rates to be used alongside taxable items.

An array of [tax.Combo](/draft-0/tax/combo)

## Schema ID

`https://gobl.org/draft-0/tax/set`

## Validation Rules

| Field              | Test                                                        | Validation Code / Message                                         |
| ------------------ | ----------------------------------------------------------- | ----------------------------------------------------------------- |
| <small>Set</small> | <ul class="gobl-test"><li>No duplicate categories</li></ul> | `GOBL-TAX-SET-01`<br />All tax categories in a set must be unique |