packages 
A Calcurate ‘Package’ is available for each English rating list revaluation period from 1990 to 2023. The next package is expected to be 2026. A corresponding Scottish and Welsh calculator will also be supplied but they may not be as fully featured as the English.
The 2023 package calculates liability from 1/4/23 to 31/3/26.
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.