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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As the strangers approach the bed, I wonder if this could be a moment of great gentleness

I don’t know what to do. In my old T-shirt and M&S pants, I don’t know what to do.

It’s 1.13am on an autumn morning some time towards the end of the 20th century and I’m awake in a vast hotel bed in a small town in the east of England. The mysterious east, with its horizons that seem to stretch further than they should be allowed to stretch by law. I can’t sleep. My asthma is bad and I’m wheezing. The clock I bought for £3 many years earlier ticks my life away with its long, slow music. The street light outside makes the room glow and shimmer.

I can hear footsteps coming down the corridor – some returning drunks, I guess, wrecked on the reef of a night on the town. I gaze at the ceiling, waiting for the footsteps to pass.

They don’t pass. They stop outside my door. I can hear whispering and suppressed laughter. My clock ticks. I hear a key card being presented, then withdrawn. The door opens slowly, creaking like a door on a Radio 4 play might. The whispering susurrates like leaves on a tree.

It’s an odd intrusion, this, as though somebody is clambering into your shirt, taking their time. A hotel room is your space, your personal kingdom. I’ve thrown my socks on the floor and my toothbrush is almost bald in the bathroom even though there’s a new one in my bag because I thought I would be alone in my intimacy.

Two figures enter. A man and a woman make their way towards the bed. In the half-dark, I can recognise the man as the one who checked me in earlier. He says, “It’s all right, there’s nobody in here,” and the woman laughs like he has just told her a joke.

This is a moment. I feel like I’m in a film. It’s not like being burgled because this isn’t my house and I’m sure they don’t mean me any harm. In fact, they mean each other the opposite.

Surely they can hear my clock dripping seconds? Surely they can hear me wheezing?

They approach, closer and closer, towards the bed. The room isn’t huge but it seems to be taking them ages to cross it. I don’t know what to do. In my old T-shirt and M&S pants, I don’t know what to do. I should speak. I should say with authority, “Hey! What do you think you’re doing?” But I don’t.

I could just lie here, as still as a book, and let them get in. It could be a moment of great gentleness, a moment between strangers. I would be like a chubby, wheezing Yorkshire pillow between them. I could be a metaphor for something timeless and unspoken.

They get closer. The woman reaches her hand across the bed and she touches the man’s hand in a gesture of tenderness so fragile that it almost makes me sob.

I sit up and shout, “Bugger off!” and they turn and run, almost knocking my clock from the bedside table. The door crashes shut shakily and the room seems to reverberate.

This article first appeared in the 12 January 2017 issue of the New Statesman, Putin's revenge