## Documentation Index Access the complete documentation index at: https://www.zoho.com/za/books/kb/llms.txt Use this file to discover all available documentation pages before proceeding. [Back](./) # How do I add the VAT number of my customer? **Prerequisite:** Make sure you have enabled **VAT Settings** under the _VAT_ section in the _Settings_ page. You can add the VAT number / TIN to your existing as well as new customers. Here’s how you add the VAT number to a new customer: * Navigate to **Customers and Vendors** under _Preferences_ in the _Settings_ page. * Scroll down to the **Customer and Vendor Billing Address Format** pane. * Click the **Insert Placeholders** dropdown. * Click **TIN** from the list displayed. * **Save** your preferences. * Now, go to **Customers** tab in the _Sales_ module. * Click the customer name for whom you wish to add their tax number details. * Click the **Edit** button and scroll down to the _Other Details_ section. * Choose _VAT Treatment_ as **VAT Registered** from the dropdown. Upon updating the tax treatment, you can see a field to enter the **VAT Registration Number** below it. * Enter the details and click **Save**. Similarly, you can follow the above steps to include VAT number / TIN in the **Customer and Vendor Shipping Address Format**. * * *