VAT on Retention Invoice

In situation when we need to calculate VAT at retention Invoice we need to set settings in contract with customer:

For this setting it is needed to open contract with Terms tab.
Here it should be marked "Apply retention", set percentage of retention, retention periods and Calculation VAT at retention Invoice should be set as "yes".

After creating Estimates for current project we may generate Progressive Invoice for project:
 
Before creating new Invoice document window with percentage of estimated revenue will appear:

After indicating of percentage, Invoice document will be generated:



And after finish of project tasks when it will be time to return retention it might be generated Invoice with transaction type "Retention Return"

In that document will be filled:



And based on this Invoice, we may generate Tax Invoice.