This program rather reminds me of Christmas aftershave; a small cassette and manual in an impressive box. Disappointment lurked within however. Not only did the glued cassette jam, but once freed, it failed to load first time.
I read the manual only to find that there were a number of circumstances it wouldn't deal with, advising the services of an accountant instead. I managed to load the program eventually and then crashed it quite by accident!
After such a catalogue of misfortune, I don't feel that I would trust it to calculate my tax liability for 1982-83. (You need a new program every time the tax laws change).