Well, you don't get paid a different amount, so far as I know. I think local authorities set their own rates for paying foster carers (I may be wrong on this) and you would get paid more for additional care needs. So the amount you would be paid would depend on all sorts of factors - number of children, ages, care needs. Generally, though, the pay is very poor, the demands are very high, and hence the shortage of foster carers. With all the goodwill in the world, I can't think of many of my friends who have a spare room, no young children, and don't need to work.