I pay my c/taxbut my daughter who is now 18 and unemployed will my c/tax now go up?

When Thatcher 1st introduced Poll Tax it applied to all members of a household over 18(might have been 16) however after many protests this was changed to a tax on the property value regardless of how many residents of the property,ie your council tax bill should be exactly the same as all houses in your valuation band under your council.I would go into your local council office & speak to an adviser you maybe entitled to some housing benefit as well as C/tax benefit, hope this helps.