DS and GF, plus her small daughter, were living together. Because their relationship is not going smoothly, she is moving into a rented house nearby.
Presumably, as a single occupier, he will be entitled to a reduction in his council tax. However they both assume that she will continue to visit and also stay over on some nights as the relationship is still fairly amicable.
Does anyone know at what point having a 'guest' to stay removes the right to a tax reduction? They both work full time so no benefits are involved.