32% of my income - no other half to share it with and thats for a "free" council house.
About the same for me in my 'free' housing association house too. Though I live in a fairly cheap area and the rent is about £100 on average cheaper than private rented round here, but then I got bare floors and no fixtures/fittings with the ha that you generally get in private rented so I'd expect to pay less. Not moaning about that before anyone jumps on me either just stating that when you get less you expect to pay less, that's all.
Council tax is the next biggest bill or fuel if you combine gas and electric together.
Not sure if housing costs are high, wages low or a combination of both but fuel, council tax and water take up another 50-60% depending on the time of year, so got between 15-25% to feed the two of us and try and have some sort of life.