Link to source: Understanding Society
There is a clear relationship between household income and the likelihood of an adult experiencing anxiety or depression. Although the gap between those with higher and lower incomes has fluctuated slightly, there is little evidence to suggest it is closing.
Since 2010/11 the proportion of adults in the poorest fifth of the population experiencing anxiety or depression has been between 23% and 28%. The rate for the those in the richest fifth of the population is much lower, currently around 13%.