How to show
VAT number in magento2 checkout-page.
Is there any option available in magento2 backend?
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If you navigate to:
Stores > Configuration > Customers > Customer Configuration > (Change Scope to correct website/store view) > Create New Account Options > Show VAT Number on Storefront
Change dropdown to Yes.
You'll then have to set up your tax classes/tax rules/customer groups and then in the above section you can assign the correct values to the groups.