John wrote:i think people on DLA are exempt from council tax
I do not think that is necessarily the case, but if the only income of the family unit is DLA, then I suspect that full CTB would be paid. Under the new Council-determined CTB rules that came into force on 01.03.13, it is totally possible that 100% CTB might still be possible, but that might still depend upon family income.
They are most certainly not exempt from council tax. The only person that could possibly be exempt (for the purpose of DLA) is someone receiving Highest Rate DLA or PIP (Daily Living) or Highest Rate AA and certified by the Dr as severely mentally impaired - I assume you are not.
If the person liable for council tax receives any rate care DLA, AA or PIP (daily living) then the non-deps in the house will be disregarded - there will be no deduction for them.
You can only have the severe disability premium if you are classed as living alone. Once your spouse moves in then you will lose that premium.
Again, I assume the people you are currently living with are also receiving DLA care? if not then when your spouse moves in there will also be a non-dep deduction from the council tax benefit.