my opinion--
council tax ( a UK ) thing is a necessary evil, It is based on property value--which so often is wildly wrong.
A couple --earning an average income pay 100% of it
The same couple--with ( say ) 3 adults at home--each earning good money--the cost is the same.
The same couple--but out of work--on benefits--pay nothing.
A single occupant--working, pays 75%.
The council tax replaced the much hated poll tax--which was much fairer!
i have to pay over £2000 a year in council tax--yet i am on the state pension, i pay no income tax on it, but have some savings--and my wife works.
in many cases--people working full time pay very little income tax--yet full council tax.
local income tax would be a much fairer system