Unsolved issue with Italian (and maybe European) tax schema

Unsolved issue with Italian (and maybe European) tax schema

Despite I found many discussion about it a can't understand IF and HOW I can achieve the following taxation schema:

-----------------------------------------------------------------------------------
Service 1:                                        €1500.00 

Insurance compensation (4% of Service 1):           €60.00
                                                 ---------
Subtotal 1 (Service1 + Insurance compensation):   €1560.00

VAT (21% applied to Subtotal1):                    €327.60

Invoice total (Subtotal1 + VAT):                  €1887.60
                                                 ---------
Witholding TAX (20% of Subtotal1):               - €312.00
                                                 ---------
Net Pay (Invoice total - Witholding tax):         €1576.60


My conclusion is that is not possible, and that ZOHO Invoice is still not ready for our market, but I will gladly change my mind if you can show me how I can do it... ;-)

Stefano