Have a household income below a certain level, which varies by location:
£30,420 per year for a single person, £38,480 per year for a couple, £46,540 per year for a family of four.
£27,770 per year for a single person, £34,730 per year for a couple, £41,690 per year for a family of four.
£25,830 per year for a single person, £32,790 per year for a couple, £39,750 per year for a family of four.
£24,120 per year for a single person, £30,980 per year for a couple, £37,840 per year for a family of four.