How is sales tax calculated on a manual invoice?

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US Sales Tax/VAT

US sales tax and VAT are calculated using the account level address when creating a manual invoice. In the case of VAT, an account may have its own VAT number. The account's VAT number is factored into the tax calculation, along with the address. You can find more information about VAT here.

The Account Information address is always used as the customer’s taxable address on manual invoices, unless there is a customer shipping address on the invoice.

Here is useful documentation regarding VAT Validation for B2B merchants: https://docs.recurly.com/docs/vat-number-validation