We've kept something of a wary eye on the Joseph Rowntree Foundation's ruminations on poverty over the years. Near a decade back they started that idea of the living wage. Ask people what people should be able to do if they're not in poverty. Along the lines of Adam Smith's linen shirt example. So far so good - but it was a measure of what is it that, by the standards of this time and place, people should be able to do and not be considered to be in poverty. 

In this latest report of theirs they are saying that if the average family isn't on the verge of paying 40% income tax then they're in poverty.

This is not, we submit, a useful or relevant measure of poverty. But it is the one that they are using. Here is their definition:

In 2008, JRF published the Minimum Income Standard (MIS) – the benchmark of minimum needs based on what goods and services members of the public think are required for an adequate standard of living. This includes food, clothes and shelter; it also includes what we need in order to have the opportunities and choices necessary to participate in society. Updated annually, MIS includes the cost of meeting needs including food, clothing, household bills, transport, and social and cultural participation.

JRF uses 75% of MIS as an indicator of poverty. People with incomes below this level face a particularly high risk of deprivation. A household with income below 75% of MIS is typically more than four times as likely to be deprived as someone at 100% of MIS or above. In 2016, a couple with two children (one pre-school and one primary school age) would need £422 per week to achieve what the public considers to be the Minimum Income Standard, after housing and childcare costs. A single working-age person would need £178 per week

Having an income that is just 75% of these amounts –£317 for the couple and £134 for the single person – is an indication that a household’s resources are highly likely not to meet their needs. The further their incomes fall, the more harmful their situation is likely to be.

So that's £16,500 a year for the high risk of deprivation and £22,000 a year for poverty. But note (this for the average family, two plus two) that this is disposable income after housing and childcare costs. We must add those back in to get the other definition of disposable income, the one that ONS uses.

Average rent is £816 a month, average childcare costs are £6,000 a child a year.

That's therefore £38,500 a year or £44,000 a year in actual consumption possibilities for such a family. That higher number marks poverty, the lower potential deprivation.

As ONS tells us (and this is disposable income, after tax and benefits, before housing and childcare) median household income in the UK is:

The provisional estimate of median household disposable income for 2014/15 is £25,600. This is £1,500 higher than its recent low in 2012/13, after accounting for inflation and household composition, and at a similar level to its pre-downturn value (£25,400)

And do note that ONS definition:

Disposable income:

 Disposable income is the amount of money that households have available for spending and saving after direct taxes (such as income tax and council tax) have been accounted for. It includes earnings from employment, private pensions and investments as well as cash benefits provided by the state.

The JRF is using a definition of poverty that is higher than median income for the country. This is insane. It gets worse too. The band for higher rate income tax starts at £43,000. The JRF is defining a two parent, two child, household beginning to pay higher rate income tax as being in poverty.

To put this another way, a British family in the top 0.23% of the global income distribution for  an individual is in poverty and one in the top 0.32% of that global distribution is deprived. Yes, after adjusting for price differences across countries.

The British population is some 1% of the global population. It's not actually possible for us all to be in anything more than the top 1% of the global income distribution.

This simply is not a valid manner of trying to define poverty.