Why any tax avoidance "clampdown" is a ridiculous game of whack-a-mole

Danny Alexander's "mansion tax lite" has been torpedoed by oligarchs claiming their £2m+ properties are "open to the public". It shows how hard it is to stop the rich - and their lawyers - finding creative ways to beat the taxman.

In all the furore around the Budget, the Spending Review and so on, many have ignored the introduction of the Lib Dems so-called "mansion tax for tax-dodgers". This "tax", which only affects properties worth over £2m, was actually the closing of a loophole. 

The loophole in question - which allowed people to avoid stamp duty on expensive properties using offshore companies - was theoretically sealed from the start of April. A super-duty of 15 per cent was imposed on the purchase of properties worth more than £2m by companies; and an annual charge of up to £140,000 every year was levied on them once they were bought.

Well, in theory, at least. Like almost everything else the Lib Dems have promised to do, this has all fallen down around their ears. Why? Well, that's all down to clever tax lawyers seeing a new loophole, accidentally provided by short-term lettings website Air BnB.

You see, there's an exemption written into the rules, which lets off properties which are "open to the public" from the new tax. It's meant to exempt stately homes and museums, which are often private homes but open for viewing over the summer, and quite legitimately put the earnings from the tea room into a company. No one wanted them to be hit with a levy intended to stop tax-dodging oligarchs.

Of course, when you close a loophole intended for oligarchs, you'd better be sure not to open another, or their lawyers will spot it. One bright tax lawyer came up with the idea that if you offer to let out your property - regardless of whether you actually let out - it's technically "open to the public", in that literally anyone could pay to go and stay there. Provided, of course, they can afford whatever you are charging.

It's probably pretty reasonable to charge a fortune for your One Hyde Park flat, given the amenities, which include all your mail being X-rayed, iris recognition in the lifts, panic rooms, bomb-proof windows, a 21-metre swimming pool, a cinema, a golf simulator, a wine cellar and room service via a secret tunnel from the five-star Mandarin Oriental hotel next door.

So, you advertise your One Hyde Park flat (registered to an offshore company, of course - as 59 out of 77 flats in the building are) on Air BnB, no one volunteers to pay the huge fee you ask for, and you save yourself 140 grand in tax. Worst case scenario, you have to let out your flat to someone, but you probably don't care, because you can arrange to be skiing in Gstaad for that week anyway.

Some of the properties currently being offered on AirBnb are at eye-wateringly high prices. While there is no evidence that, for example, this £3,175 a night flat is using the loophole I've described - I can confirm from a tax lawyer for a major firm (who asked not to be named) - that offering your flat out to rent has become the standard advice being doled out to his firm's "high net worth clients".

So, Air BnB will doing brisk - perfectly legal - business as every oligarch and his babushka registers. And no one who is well advised will pay the Mansion Tax-lite. And the Lib Dem plan is yet another failure. Thanks internet!

Of course, while there is some schadenfreude to be had from yet another Lib Dem flagship policy running aground on the rocks of reality, it's also a salutary lesson for policy makers on the sheer difficulty of clamping down on tax avoidance. Even if they close the "AirBnB loophole", the lawyers of the rich will find another, as long as the "open to the public" exemption still exists.

This story is a great example of how the government's attempts to clamp down on tax avoidance amount to a ridiculous game of whack-a-mole - if we want to get serious about tackling tax avoidance, what we need is root and branch reform, not tinkering at the edges. Put away the mallet, George, and pick up a bazooka.

One Hyde Park in London: many of its apartments are owned by companies in the British Virgin Islands. Photograph: Getty Images

Willard Foxton is a card-carrying Tory, and in his spare time a freelance television producer, who makes current affairs films for the BBC and Channel 4. Find him on Twitter as @WillardFoxton.

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Tissues and issues for Labour: Corbynite celebrity Charlotte Church votes Plaid Cymru

The singer, who championed Corbyn's leadership, has voted for Labour's rivals in the Welsh Assembly election.

Charlotte Church, hot on the anti-auserity campaign trail and a regular at pro-Corbyn rallies, has voted for Plaid Cymru.

Here is her tweet supporting Labour's rivals, on the day of the Welsh Assembly elections:

The singer's vote suggests she has fallen out of love with Corbyn; she had previously made her support for the Labour leader known by performing at "Jeremy Corbyn for PM" fundraisers for him, and writing an endorsement of his leadership:

"The inverse of Nigel Farage, he appears to be a cool-headed, honest, considerate man, one of the few modern politicians who doesn’t seem to have been trained in neuro-linguistic programming, unconflicted in his political views, and abstemious in his daily life. He is one of the only politicians of note that seems to truly recognise the dire inequality that exists in this country today and actually have a problem with it. There is something inherently virtuous about him, and that is a quality that can rally the support of a lot of people, and most importantly, a lot of young people. With the big three zero on the horizon for me, I don’t know if I still count as a “young person”. What I can say is that for the first time in my adult life there is a politician from a mainstream party who shares my views and those of most people I know, and also has a chance of actually doing something to create a shift in the paradigm, from corporate puppetry to conscientious societal representation."

And, as Guido points out, Church is not the only celebrity Corbyn champion who has witheld support for Labour today. The actor Emma Thompson, who backed Corbyn for Labour leader, has endorsed the Women's Equality Party in the London mayoral election.

I'm a mole, innit.