packages 
A Calcurate ‘Package’ is available for each English rating list revaluation period from 1990 to 2017. The next package is expected to be 2023. A corresponding Scottish and Welsh calculator will also be supplied but they may not be as fully featured as the English.
The 2017 package calculates liability from 1/4/17 to 31/3/23.
The 2010 package calculates liability from 1/4/10 to 31/3/17.
The 1990 to 2005 packages will be supplied with the 2010 package.