All these taxes were based, obviously, on apparent wealth. The more you had the more you paid. Own Use was considered a luxury and did not form part of the 'business', therefore a tax was put on it. The parishes and vestries also had their own taxes - mainly to fill the coffers to give the poor some sustenance. there is quite a lot more on the internet about these - if you do some lateral thinking! The dog tax, for example, was used as a buffer against roving dogs killing livestock - the livestock owner was recompensed by his local governemnt.