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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As a Conservative MP, I want Parliament to get a proper debate on Brexit

The government should consider a Green Paper before Article 50. 

I am very pleased that the government has listened to the weight of opinion across the House of Commons – and the country – by agreeing to put its plan for Brexit before Parliament and the country for scrutiny before Article 50 is triggered. Such responsiveness will stand the government in good stead. A confrontation with Parliament, especially given the paeans to parliamentary sovereignty we heard from Leave campaigners during the referendum, would have done neither the Brexit process nor British democracy any good.

I support the government’s amendment to Labour’s motion, which commits the House to respecting the will of the British people expressed in the referendum campaign. I accept that result, and now I and other Conservatives who campaigned to Remain are focused on getting the best deal for Britain; a deal which respects the result of the referendum, while keeping Britain close to Europe and within the single market.

The government needs to bring a substantive plan before Parliament, which allows for a proper public and parliamentary debate. For this to happen, the plan provided must be detailed enough for MPs to have a view on its contents, and it must arrive in the House far enough in advance of Article 50 for us to have a proper debate. As five pro-European groups said yesterday, a Green Paper two months before Article 50 is invoked would be a sensible way of doing it. Or, in the words of David Davis just a few days before he was appointed to the Cabinet, a “pre-negotiation white paper” could be used to similar effect.

Clearly there are divisions, both between parties and between Leavers and Remainers, on what the Brexit deal should look like. But I, like other members of the Open Britain campaign and other pro-European Conservatives, have a number of priorities which I believe the government must prioritise in its negotiations.

On the economy, it is vital that the government strives to keep our country fully participating in the single market. Millions of jobs depend on the unfettered trade, free of both tariff and non-tariff barriers, we enjoy with the world’s biggest market. This is absolutely compatible with the result, as senior Leave campaigners such as Daniel Hannan assured voters before the referendum that Brexit would not threaten Britain’s place in the single market. The government must also undertake serious analysis on the consequences of leaving the customs union, and the worrying possibility that the UK could fall out of our participation in the EU’s Free Trade Agreements (FTAs) with non-EU countries like South Korea.

If agreeing a new trading relationship with Europe in just two years appears unachievable, the government must look closely into the possibility of agreeing a transitional arrangement first. Michel Barnier, the European Commission’s chief negotiator, has said this would be possible and the Prime Minister was positive about this idea at the recent CBI Conference. A suitable transitional arrangement would prevent the biggest threat to British business – that of a "cliff edge" that would slap costly tariffs and customs checks on British exports the day after we leave.

Our future close relationship with the EU of course goes beyond economics. We need unprecedentedly close co-operation between the UK and the EU on security and intelligence sharing; openness to talented people from Europe and the world; and continued cooperation on issues like the environment. This must all go hand-in-hand with delivering reforms to immigration that will make the system fairer, many of which can be seen in European countries as diverse as the Netherlands and Switzerland.

This is what I and others will be arguing for in the House of Commons, from now until the day Britain leaves the European Union. A Brexit deal that delivers the result of the referendum while keeping our country prosperous, secure, open and tolerant. I congratulate the government on their decision to involve the House in their plan for Brexit - and look forward to seeing the details. 

Neil Carmichael is the Conservative MP for Stroud and supporter of the Open Britain campaign.