What if the tax and benefits system already rewards marriage?

If you want the system to incentivise staying together, then relax.

MPs have written to the Chancellor this morning calling for the introduction of a marriage tax allowance. But what if the tax and benefits system already rewards marriage?

This would challenge the idea of the 'couple penalty' - the idea that the tax and benefit system makes it more attractive for families to split up than stay together. It's not mentioned in the MPs' letter, but it's an implicit part of the debate around the issue.

In principle, it sounds like a simple thing to work out: you would just need to calculate whether the system makes people richer if they split up, or not.

The problem is that it's relatively easy to work out how taxes and benefits change if a couple split up - but harder to work out how their cost of living changes. Economies of scale kick in when you live with a partner, and you need to calculate how much cheaper bills, rent and living expenses are under one roof.

The usual way of working out this is using an equivalence scale: a ratio that estimates how much extra family members cost. Most analyses that have suggested a 'couple penalty' exists rely on these scales, and usually an OECD scale drawn up in 1982. These scales generally rely on researchers' assumptions [pdf] about economies of scale and how people live - not, as a rule, actual evidence about how people live. They're not entirely plucked out of the air, but they are not really a meaningful way to assess relative need.

So why not ditch the abstraction, and actually aim to understand what people in the real world need to live on based on a common framework, and then work out the relative cost of living together or apart?

We need not imagine: this June some researchers did just that (report here [pdf]). Analysing what real, live, actual people said they need to live, and then combing through that to work out the precise cost of living, it found a rather different picture. An unemployed couple, for example, would be £62 a week worse off if they split up; if one parent was in work at £9 an hour they would £36 worse off; if both worked, it was £44. The numbers vary by family size and type but as a rule, people are not better off apart.

None of this necessarily makes the idea of marriage tax allowances a bad one, or undermines the aim of supporting families more generally. It does suggest extreme caution though. Policy based on a purely theoretical understanding of how couples manage money is likely to be ineffective policy. Examining the couple penalty is far from easy, but the best analysis we have suggests it doesn't exist on a systematic basis.

What's more, it suggests much of the angst about undermining marriage is misplaced. If you want the system to incentivise staying together, then relax, and rejoice: it already does.

Photograph: Getty Images

Gordon Hector is public affairs manager for the Joseph Rowntree Foundation.

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In your 30s? You missed out on £26,000 and you're not even protesting

The 1980s kids seem resigned to their fate - for now. 

Imagine you’re in your thirties, and you’re renting in a shared house, on roughly the same pay you earned five years ago. Now imagine you have a friend, also in their thirties. This friend owns their own home, gets pay rises every year and has a more generous pension to beat. In fact, they are twice as rich as you. 

When you try to talk about how worried you are about your financial situation, the friend shrugs and says: “I was in that situation too.”

Un-friend, right? But this is, in fact, reality. A study from the Institute for Fiscal Studies found that Brits in their early thirties have a median wealth of £27,000. But ten years ago, a thirty something had £53,000. In other words, that unbearable friend is just someone exactly the same as you, who is now in their forties. 

Not only do Brits born in the early 1980s have half the wealth they would have had if they were born in the 1970s, but they are the first generation to be in this position since World War II.  According to the IFS study, each cohort has got progressively richer. But then, just as the 1980s kids were reaching adulthood, a couple of things happened at once.

House prices raced ahead of wages. Employers made pensions less generous. And, at the crucial point that the 1980s kids were finding their feet in the jobs market, the recession struck. The 1980s kids didn’t manage to buy homes in time to take advantage of low mortgage rates. Instead, they are stuck paying increasing amounts of rent. 

If the wealth distribution between someone in their 30s and someone in their 40s is stark, this is only the starting point in intergenerational inequality. The IFS expects pensioners’ incomes to race ahead of workers in the coming decade. 

So why, given this unprecedented reversal in fortunes, are Brits in their early thirties not marching in the streets? Why are they not burning tyres outside the Treasury while shouting: “Give us out £26k back?” 

The obvious fact that no one is going to be protesting their granny’s good fortune aside, it seems one reason for the 1980s kids’ resignation is they are still in denial. One thirty something wrote to The Staggers that the idea of being able to buy a house had become too abstract to worry about. Instead:

“You just try and get through this month and then worry about next month, which is probably self-defeating, but I think it's quite tough to get in the mindset that you're going to put something by so maybe in 10 years you can buy a shoebox a two-hour train ride from where you actually want to be.”

Another reflected that “people keep saying ‘something will turn up’”.

The Staggers turned to our resident thirty something, Yo Zushi, for his thoughts. He agreed with the IFS analysis that the recession mattered:

"We were spoiled by an artificially inflated balloon of cheap credit and growing up was something you did… later. Then the crash came in 2007-2008, and it became something we couldn’t afford to do. 

I would have got round to becoming comfortably off, I tell myself, had I been given another ten years of amoral capitalist boom to do so. Many of those who were born in the early 1970s drifted along, took a nap and woke up in possession of a house, all mod cons and a decent-paying job. But we slightly younger Gen X-ers followed in their slipstream and somehow fell off the edge. Oh well. "

Will the inertia of the1980s kids last? Perhaps – but Zushi sees in the support for Jeremy Corbyn, a swell of feeling at last. “Our lack of access to the life we were promised in our teens has woken many of us up to why things suck. That’s a good thing. 

“And now we have Corbyn to help sort it all out. That’s not meant sarcastically – I really think he’ll do it.”