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The U.K. government's recent mini-budget has come in for a lot of criticism. Its effect on stock markets, pensions and the value of the pound have barely been out of the news. As a clinical psychologist, one issue I find alarming, but has barely been discussed, is the possible effect this will have on the mental health of the British public. Specifically, I am concerned about the cutting of the top rate of tax, what this will do to income inequality, and what this will do to people's mental health.

The cut to the rate of basic income tax from 20% to 19% will have a very minimal effect on low and middle earners—saving on average . But abolishing the top 45% tax rate for those earning £150,000 or more will see the very wealthy with a lot more cash.

Those earning a million a year will save . Given the average (median) U.K. salary for full-time workers is (before tax, pensions and national insurance is deducted), this is a big handout to top earners and a minimal one to low earners at a time of record inflation and steeply rising energy bills.

Regardless of your views about the evidence for trickle-down economics, you should know what the research says about the impact of income inequality on health. , a book published in 2009 by U.K. economists Kate Pickett and Richard Wilkinson, shows that for developed countries, a larger difference between rich and poor has a massive effect on things such as obesity, infant mortality, imprisonment and murder rates.

Countries with lower levels of inequality, such as Japan and Spain, typically have lower levels of these problems. Countries with higher levels of inequality, such as the U.K. and the U.S., typically have much higher rates.

This relationship also exists for mental health. The figure below, from the book, shows this link and paints a stark image.

The relationship between the level of income inequality and the percentage of the population with a mental illness

A of 65 countries found that developed countries with a greater (an economic measure of income inequality) had higher rates of depression across the course of a year, after taking into account demographic variables such as age and education. The most unequal countries had more than 50% greater prevalence of depression compared with the most equal countries.

Of course, just because two things are associated doesn't mean one is causing the other, but a review concluded there is for a causal relationship between income inequality and health. For example, changes in income distribution predict later changes in public health, not the other way around.

The difference between rich and poor in the U.K. has been since the late 1970s, though it decreased slightly in 2021. At a time of record inflation and stagnant wages, the poor are getting much poorer. But the rich are getting richer, with pay for chief executives at the U.K.'s top 100 companies increasing by . The latest budget will increase the gap between rich and poor. Add to this the fact that a recession is forecast, which is likely to , debt levels are likely to increase and those with mental health problems are over three times as likely to have , and it's clear who will take the mental health brunt of the cost of living crisis and the latest budget.

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