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.

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Has Arlene Foster saved power-sharing in Northern Ireland?

The DUP leader's decision to attend Martin McGuinness' funeral was much more than symbolic. But is Gerry Adams willing to make a deal?

After some prevarication, DUP leader Arlene Foster chose to attend the funeral of Martin McGuinness in Derry today. Her decision to do so cannot have been an easy one.

A substantial part of her loyalist base has noisily resisted attempts to memorialise the late deputy first minister as anything other than an inveterate killer. Foster herself notes in today’s Belfast Telegraph that the former IRA commander was responsible for the deaths of “many neighbours and friends”. And in 1979 – aged just eight – she bore witness to the bloody aftermath of an IRA attack in her own home: her father, a reservist police officer, was shot in the head by a gunman later eulogised by McGuinness.

Her attendance at today’s funeral is thus noteworthy and has been the subject of due praise. She was twice applauded by the congregation: as she took her seat, and after Bill Clinton singled her out in his eulogy. It is, however, much more than the symbolic gesture it might appear.

Last month’s election, which saw the DUP lose 10 seats and unionist parties lose their Stormont majority for the first time in nearly a century, proved Foster to be damaged goods. She was – and remains – tarnished by the RHI scandal but also by her crass behaviour towards the nationalist community, particularly on Irish language issues.

Her carelessly won reputation as a truculent bigot will therefore not be easily lost. Her departure remains a red line for Sinn Fein. But with just four days until the deadline for a new devolution settlement, Foster’s presence at McGuinness’ funeral is the clearest indication yet of the DUP’s carefully calculated strategy. It isn’t quite a resignation, but is nonetheless indicative of the new manner in which Foster has carried herself since her party’s chastening collapse.

She has demonstrated some contrition and offered tacit acknowledgement that her election shtick was misjudged and incendiary. Her statement on McGuinness’ death was delicately pitched and made only oblique reference to his IRA past. In the absence of a willingness to allow Foster to step down, the decision instead has been taken to detoxify her brand.

The conciliatory Foster the DUP will nominate for First Minister on Monday will as such at least appear to be apart from the dogwhistling Foster who fought the election – and her attendance today is the superlative indication of that careful transition. There has been talk that this increases the chance of a deal on a new executive. This is premature – not least because the onus is now almost entirely on Sinn Fein.

Theirs is just as much a mandate to reject Stormont as we know it as it is to return and right the DUP’s wrongs. Gerry Adams, the last member of the Armalite generation standing, has made this abundantly clear – and has hardened his line just as Foster has made sure to be seen magnanimously softening hers. He said last night that he would not tolerate any extension of power-sharing talks beyond Monday’s deadline, and called on Dublin to prevent the UK government from re-instating direct rule.

Though Adams also maintained a deal was still possible in the coming days, his statement augurs badly. As the former UUP leader Lord Empey told me on the day McGuinness died, the Sinn Fein president – the ideologue to McGuinness’ Stormont pragmatist – is now entirely without equal within his party. Though he has set the transition to a new generation of female leaders in train, he remains in total control.

The demand for Dublin’s involvement is also telling: as the leader of the third-biggest party in the Dail, his is an all-Ireland long game. Enda Kenny will soon depart, offering Fianna Fail – riding high in the polls – a useful pretext to renegotiate or scrap their confidence and supply arrangement with his minority government. Sinn Fein are on course to make gains, but implementing Brexit and austerity as partners in a Stormont executive would undermine their populist anti-austerity platform.

As such, Empey predicted McGuinness’ death would allow Adams to exert a disruptive influence on the talks to come. “I don’t think it’ll be positive because for all his faults, Martin was actually committed to making the institutions work,” he said. “I don’t think Gerry Adams is as committed – and it was obvious from the latter part of last year that Gerry was reinstating his significant influence in the party. For that reason I think it will make matters more difficult.  I hope I’m wrong, but that’s my sense.”

He is not alone. There was, earlier this week, growing confidence in Westminster that some fudge could be reached on the most contentious issues. It isn't impossible - but Adams’ renewed dominance and rejection of the extended timeframe such negotiations would undoubtedly require suggests a new executive is as unlikely a prospect as it has ever been. With Foster quietly reinventing herself, the DUP could be the big winners come the next election (which could come this year and reinstate a unionist majority) – and the resurgent republicans might well rue the day they squandered their big chance.

Patrick Maguire writes about politics and is the 2016 winner of the Anthony Howard Award.