When you connect your Payhawk account to Exact Online, your available Exact Online VAT rates are automatically imported.
If you update your Exact Online VAT rates after the connection between the two systems has been established, you have to manually update that data in Payhawk.
To manually update your VAT rates in Payhawk:
Log in to the Payhawk web platform.
Go to Settings > Expense fields.
Under Built-in fields, select Tax rate.
Click on Update from Exact Online. As a result, Payhawk will show the VAT rates that are applicable to the specific expense.