Stamp duty versus mansion tax

Although superficially similar, high stamp duty is not a mansion tax

It seems increasingly likely that one of the measures to be announced in the budget in a couple of hours will be an increase in stamp duty to 7 per cent for properties worth over £2m. The argument seems to be that because the Conservatives will be compromising on the 50p tax – cutting it to 45p rather than scrapping it altogether – the Liberal Democrats will compromise on the mansion tax, allowing Osborne to introduce it as a new rate on an existing tax rather than new tax altogether.

Unfortunately, while the mansion tax isn't a great tax – it was sold as a proxy wealth tax, when household value isn't that great a proxy for wealth – it is still better than stamp duty. This is because it is at heart a consumption tax (you pay it for "consuming" a year's worth of £2m+ housing), whereas stamp duty is a transaction tax.

As the Mirrlees review on taxation explained (volume II, page 151):

Any tax on transactions will reduce expected welfare by discouraging mutually beneficial trades. Welfare is maximized when assets are owned by the people who place the highest value on them. Taxing transactions will affect who owns an asset, and so can disrupt the efficient pattern of ownership.

The value of a good or service is determined by the flow of benefits that are derived from owning it. So a consumption tax can be levied either on the purchase price of the good or service when it is first sold or on the flow of benefits over time. A transactions tax does not do this and it always seems preferable to tax the benefits directly...

Stamp duty on house transactions, for example, taxes according to the number of times a house changes hands over its lifetime. Houses vary considerably in the number of times they are traded, but there is no good economic argument for taxing more-frequently-traded housing more. Worse still, a tax on transactions reduces the incentive to trade in housing and leads to less efficient usage of the housing stock. A tax on the consumption value of housing would make sense... but a stamp duty on transactions does not.

It is a basic tenet of capitalism that, in a free market, transactions are good. By definition, if they are entered into, they make both parties better off – and stamp duty, by imposing a cost on it, means that otherwise beneficial exchanges may not occur.

This is, incidentally, the basis of the argument against a financial transactions tax; the comeback is that financial transactions occur in a broken market, and so cannot be expected to be mutually beneficial – and certainly not socially beneficial.

The Mirrlees report ended up recommending that stamp duty be abolished in its entirity, but instead the chancellor will be putting an even greater proportion of the UK's fiscal burden on it. Given it is being used as a proxy version of a proxy version of an efficient tax, it is not surprising that it has problems.

Mansion: The house allegedly bought by Saif Gaddafi in Hampstead, London (Getty)

Alex Hern is a technology reporter for the Guardian. He was formerly staff writer at the New Statesman. You should follow Alex on Twitter.

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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.