Head into the Suppliers section to the left of your screen in the icon ribbon and click Suppliers to find the supplier you want

Select it then hit Edit . Scroll down to Supplier Rules and change the Default Tax Code.

If the supplier default tax rate is left blank, the account default tax rate will apply for taxed components of invoices for that supplier. If a tax rate is applied on a supplier level, this will override your accounts default tax rate. Once you are done click the Update to the bottom right of your screen

You can also set a rate that automatically differs! Find out how to do so from this link.
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If you have a supplier which is always at 0% Tax, but the Tax Code differs from the one set in your Accountancy Settings, you can do so by setting this 0% Rate in your Supplier similar to the above.
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For example, if your Accountancy Settings have a Tax Free Rate of 0% - Exempt Expenses, but this individual supplier needs to apply 0% No VAT, you can set the No VAT rate in the supplier profile. This will automatically apply the No VAT rate on any bills that are received, regardless if they are taxed or tax free.