One-adult households, whether unattached individuals or lone parents, are typically three to four times more likely to fall into a vulnerable income situation as a result of not working. This reflects the lesser ability of one-adult households to mitigate income losses arising from unemployment, for example by temporarily relying on a spouse’s or parent’s income during an unemployment spell, thereby making them more likely to have to rely on the lower tier of income assistance. However, strong conclusions cannot be drawn because data are only available through 2009 before the strongest test of the efficacy of SA in backstopping UB had arrived in most countries.