# $taxRulesField->required()

- Source: `src/Form/Mixin/Required.php#L29` <https://github.com/getkirby/kirby/blob/6.0.0-beta.1/src/Form/Mixin/Required.php#L29>
- Inherited from Kirby, not part of the Merx API. See <https://getkirby.com/docs/reference>.

```php
$taxRulesField->required(): bool
```

## Return type

`bool`

## Parent class

`Wagnerwagner\Merx\TaxRulesField` inherited from `Kirby\Form\Field\InputField`