how to calculate the new tax

from January 1 , due to the Decree Law 104/2013 , change the rates for the registration tax , land , mortgage , with regard to acts of real estate transfer , but specifically what changes we see :
first house sold by private
registration tax : 3-2 %
Mortgages: from 168 to 50 €
cadastral : from 168 to 50 €
first home sold by company
VAT: remains at 4%
registration tax : from 168 to 200 €
Mortgages: from 168 to 200 €
cadastral : 168 to 200 €
second home sold by private
registration tax : 7-9 %
Mortgages: from 2% to 50 Euros
cadastral : from 1% to 50 Euros
second home sold by company
VAT: remains at 10%
registration tax : from 168 to 200 €
Mortgages: from 168 to 200 €
cadastral : 168 to 200 €
office / building instrumental sold by private
registration tax : 7-9 %
Mortgages: from 2% to 50 Euros
cadastral : from 1% to 50 Euros
office purchased by a private non-profit organization
registration tax : from 168 € to 9% (9,000 EUR )
Mortgages: from 168 to 50 €
cadastral : from 168 to 50 €
edificale land sold by private
registration tax : 8 to 9%
Mortgages: from 2% to 50 Euros
cadastral : from 1% to 50 Euros
land sold by company
VAT: remains at 21%
registration tax : from 168 to 200 €
Mortgages: from 168 to 200 €
cadastral : 168 to 200 €
agricultural land sold by private
registration tax : 15-9 %
Mortgages: from 2% to 50 Euros
cadastral : from 1% to 50 Euros
shed sold by company
VAT: remains at 21%
registration tax : from 168 to 200 €
Mortgages: from 3% to € 200
cadastral : from 1 % to 200 €
historic building artistic sold by private non- first home
registration tax : 3-9 %
Mortgages: from 2% to 50 Euros
cadastral : from 1% to 50 Euros
As can be seen there is a considerable saving for some but an equally substantial increase for other categories of buyers.