How the mansion tax will work, and who it will hit

If you're planning to own a mansion in the future, the tax isn't as bad as it seems…

Let's clear up one myth about the mansion tax straight away: it is not going to work the way Tim Montgomerie suggests in his Times column today. Montgomerie writes:

Last week Ed Miliband joined Nick Clegg in proposing a mansion tax so that the people who live in London’s parallel universe — many of whom come from overseas and pay little in the way of income taxes — might make a greater contribution. It was a perfectly reasonable intervention but, in a sign that the Conservative Party still hasn’t understood why it can’t win elections, many Tory MPs reacted with fury. Such a tax was, they complained, unfair on the person in a £2 million home who didn’t have the necessary £20,000 to spare.

A person with a £2m home would pay nothing in tax under any version of the mansion tax previously suggested. A £20,000 tax bill implies a house worth £4m. That's because the tax Miliband eventually produces is near certain to follow the same lines as the Lib Dems' desired tax, and be set at 1 per cent of the value of the home above £2m.

The reason why is obvious: if the tax was set at 1 per cent of the total value of any home above £2m, then there would be a huge incentive to depress, either artificially or actually, the value of the home. If your house was worth £2,010,000, it would be worth paying someone up to £10,000 to come round and do £10k worth of damage to it.

More practically, the lack of a cliff-edge at which the tax comes in is also likely to prevent it doing too much to property values. It will have a depressive effect, getting stronger as the house gets more valuable, and will likely knock quite a bit off the price of a £4m house. But the changes will be about pricing in the expected future cost of the tax to the sale price, not about avoidance. For much the same reason that no-body ever says "no thanks, I'd rather earn just £8,104 and not pay tax on my income", houses aren't going to start being sold at £1.99m in any real numbers.

But that example does reveal one of the bigger problems with the fairness of the tax. No, it's not the ridiculous example given by Toby Young of someone who finds themselves living in a £4m house without the money to pay the tax bill. If you can sell your house, buy a £2m one, and pocket the lifetime earnings of someone on the median wage as the difference, you do not really get to plead poverty.

Instead, it's that the vast majority of the incidence of the tax will be on the people who own the houses today. The depressive effect it will have on house prices will be pretty much instantaneous, and will then sit there forever. The tax will also slightly dampen the rate at which house prices above £2m increase — because every £100 increase in price imposes a £1-a-year increase in tax liability — but that is small fry compared to the initial hit.

That quirk explains why the suggestion of a tax provokes such vociferous outrage amongst those owning £2m+ houses. It really is unfair on them; but it's not a matter of unfairness against the rich, so much as unfairness against this generation of the rich. And really, for a government which has done so much to harm the cause of intergenerational fairness, that's a small hit in return.

Photograph: Getty Images

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

Photo: Getty Images
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Britain's shrinking democracy

10 million people - more than voted for Labour in May - will be excluded from the new electoral roll.

Despite all the warnings the government is determined to press ahead with its decision to close the existing electoral roll on December 1. This red letter day in British politics is no cause for celebration. As the Smith Institute’s latest report on the switch to the new system of voter registration shows, we are about to dramatically shrink our democracy.  As many as 10 million people are likely to vanish from the electoral register for ever – equal to 20 per cent of the total electorate and greater than Labour’s entire vote in the 2015 general election. 

Anyone who has not transferred over to the new individual electoral registration system by next Tuesday will be “dropped off” the register. The independent Electoral Commission, mindful of how the loss of voters will play out in forthcoming elections, say they need at least another year to ensure the new accuracy and completeness of the registers.

Nearly half a million voters (mostly the young and those in private rented homes) will disappear from the London register. According to a recent HeraldScotland survey around 100,000 residents in Glasgow may also be left off the new system. The picture is likely to be much the same in other cities, especially in places where there’s greater mobility and concentrations of students.

These depleted registers across the UK will impact more on marginal Labour seats, especially  where turnout is already low. Conversely, they will benefit Tories in future local, Euro and general elections. As the Smith Institute report observers, Conservative voters tend to be older, home owners and less transient – and therefore more likely to appear on the electoral register.

The government continues to ignore the prospect of skewed election results owing to an incomplete electoral registers. The attitude of some Tory MPs hardly helping. For example, Eleanor Laing MP (the former shadow minister for justice) told the BBC that “if a young person cannot organize the filling in of a form that registers them to vote, they don’t deserve the right to vote”.  Leaving aside such glib remarks, what we do know is the new registers will tend to favour MPs whose support is found in more affluent rural and semi-rural areas which have stable populations.  

Even more worrying, the forthcoming changes to MPs constituencies (under the Boundary Review) will be based on the new electoral register. The new parliamentary constituencies will be based not on the voting population, but on an inaccurate and incomplete register. As Institute’s report argues, these changes are likely to unjustly benefit UKIP and the Conservative party.

That’s not to say that the voter registration system doesn’t need reforming.  It clearly does. Indeed, every evidence-based analysis of electoral registers over the last 20 years shows that both accuracy and completeness are declining – the two features of any electoral register that make it credible or not. But, the job must be done properly.  Casually leaving 10m voters off the electoral resister hardly suggests every effort has been made.

The legitimacy of our democratic system rests on ensuring that everyone can exercise their right to vote. This is a task which shouldn’t brook complacency or compromise.  We should be aiming for maximum voter registration, not settling for a system where one in five drop off the register.