If you need to add a default VAT for your invoices
STEP 1
Go to Configurations -> My Company
STEP 2
Choose Fiscal entities -> Edit Fiscal Entities -> Default VAT (this will apply to all issued invoices)
STEP 3
Save
If you want to use a different VAT quota on a particular customer
STEP 1
Go to Customers & Contacts -> Fiscal Entities
STEP 2
Edit the fiscal entity you want to have a different VAT
STEP 3
Go to Billing configuration -> Edit -> VAT %
STEP 4
Save
If you want to change the VAT directly on the invoice:
STEP 1
Go to Invoices -> Mark as a draft from Actions
STEP 2
Edit the invoice -> in the VAT type field change the value
STEP 3
Click Save
If you need to recalculate the amount of VAT in the invoice, a refresh is required
STEP 1
Click the VAT value field
STEP 2
Click the value line services box
STEP 3
Click on the VAT value field and the VAT value is automatically recalculated accordingly to the quota set
STEP 4
Save