Store vat code

PHP
1

Where is the best place to store vat code? In user table with first name, last name, username etc? Or where?

2

vat code

Is this the VAT rate - different items could have different rates e.g. 17% or 20%
VAT rate e.g. 20%
Or do some items have VAT and others do not

3

when asking buyer for vat, where should it be stored? In user table? And where should vat rate by items stored? In order table?

4

It depends. In the UK, some items are zero-rated, for example books. Some customers are VAT-exempt, for example charities. So you’ll need to have a VAT code for each item, and a default VAT code for the client.