There are problems with wealth taxes but avoidance, for once, isn't one of them

Taxing illiquid assets is, well, taxing.

Fraser Nelson, editor of the Spectator, has a column in today's Telegraph arguing that George Osborne needs to learn the lesson that "wealth taxes simply don't work". He writes:

The problems involved were fairly basic. Do you tax people’s worldwide wealth? If so, those much-needed businessmen will stay away. Do you tax only British wealth? Then people will move their investments abroad. The Treasury warned Healey that the proposed wealth tax was “political dynamite” – and not in a good way. At a time when Britain was in a desperate economic state, it risked dragging the country down further still. Healey gave up, saying he could not find any wealth tax that would be worth the political hassle.

This is disappointing, because Nelson is largely duelling with straw men here. It is indeed true that a tax on overall wealth could well lead to tax avoidance by the relatively simple tax planning strategy known as "keeping your cash in a Swiss bank account". The thing is, that isn't actually that much of a problem. After all, people avoid income tax as well, yet somehow we struggle on.

The measure for a tax is never "will everyone pay it rather than put their energy into avoiding it?", but "will enough people pay it to make it worth our while?" That's a different calculus, and one which Nelson doesn't address.

But the real disappointment is that, for all Nelson talks about the rising support for a wealth tax, he neglects to mention that most of that support is for taxing a very specific type of wealth: property. It's a shame, because that sort of tax – a "mansion tax", a "land value tax", or whatever form it takes – has its own set of problems which are under-discussed.

The important thing to note about property taxes do is that they completely fix the problems Nelson is concerned about when it comes to wealth taxes in general. You can keep money overseas, but a house in Britain is rather stuck where it is. To the extent that such a tax it increases the cost of living in Britain, it may keep wealthy foreigners away – but only those who haven't already been put off by the extraordinary cost of the sort of houses wealthy foreigners buy.

The thing is, land and property taxes aren't the golden bullet that many on the left like to think, for the key reason that houses aren't particularly liquid assets.

We've all heard the sob-story of the elderly pensioner who could be forced to sell the house he's lived in all his life to pay the land value tax (although we rarely hear it alongside its counterpart, the elderly pensioners who are being forced to moved out of houses they've lived in all their lives because of benefit cuts), but the key concern with such a tax is related to that problem.

If you are taxed, say, 20 per cent of your cash holdings, you pay that tax by handing 20 per cent of your cash to HMRC. If you are taxed on 20 per cent of the value of your land, you can't just hand a wing of your house over to the taxman. You either have to have the cash equivalent available, or sell your house.

Taken individually, that's not the end of the world – few will cry too hard if the odd landowner has to sell a few acres to pay the bill. The problem comes if the tax is set high enough that that sort of sale becomes commonplace.

If too many people end up trying to sell their mansions or land at the same time, then you're stuck with a sadly inevitable collapse in the price that land can go for. That's not just unfair – it means you would be taxing people on assets which are no longer worth what they were when you assessed them – it's also staggeringly inefficient. A well-designed tax should not encourage a fire-sale of assets.

These problems aren't insurmountable, by any means. But they do give pause for thought when considering the truely radical proposals like Peter Tatchell's plan to set the wealth tax rate at 20 per cent. Although back-of-the-envelope calculations suggest such a tax would generate truly staggering revenue, a more modest rate would be a better idea – at least at the start.

This mansion, in Kensington, London, was once the most expensive in the world. What'd the tax be? 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
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In the race to be France's next president, keep an eye on Arnaud Montebourg

Today's Morning Call. 

Good morning. As far as the Brexit talks are concerned, the least important voters are here in Britain. Whether UK plc gets a decent Brexit deal depends a lot more on who occupies the big jobs across Europe, and how stable they feel in doing so.

The far-right Freedom Party in Austria may have been repudiated at the presidential level but they still retain an interest in the legislative elections (due to be held by 2018). Both Lega Nord and Five Star in Italy will hope to emerge as the governing party at the next Italian election.

Some Conservative MPs are hoping for a clean sweep for the Eurosceptic right, the better to bring the whole EU down, while others believe that the more vulnerable the EU is, the better a deal Britain will get. The reality is that a European Union fearing it is in an advanced state of decay will be less inclined, not more, to give Britain a good deal. The stronger the EU is, the better for Brexit Britain, because the less attractive the exit door looks, the less of an incentive to make an example of the UK among the EU27.

That’s one of the many forces at work in next year’s French presidential election, which yesterday saw the entry of Manuel Valls, the French Prime Minister, into the race to be the Socialist Party’s candidate.

Though his star has fallen somewhat among the general public from the days when his opposition to halal supermarkets as mayor of Evry, and his anti-Roma statements as interior minister made him one of the most popular politicians in France, a Valls candidacy, while unlikely to translate to a finish in the top two for the Socialists could peel votes away from Marine Le Pen, potentially allowing Emanuel Macron to sneak into second place.

But it’s an open question whether he will get that far. The name to remember is Arnaud Montebourg, the former minister who quit Francois Hollande’s government over its right turn in 2014. Although as  Anne-Sylvaine Chassany reports, analysts believe the Socialist party rank-and-file has moved right since Valls finished fifth out of sixth in the last primary, Montebourg’s appeal to the party’s left flank gives him a strong chance.

Does that mean it’s time to pop the champagne on the French right? Monteburg may be able to take some votes from the leftist independent, Jean-Luc Mélenchon, and might do some indirect damage to the French Thatcherite Francois Fillon. His supporters will hope that his leftist economics will peel away supporters of Le Pen, too.

One thing is certain, however: while the chances of a final run-off between Le Pen and Fillon are still high,  Hollande’s resignation means that it is no longer certain that the centre and the left will not make it to that final round.

THE SOUND OF SILENCE

The government began its case at the Supreme Court yesterday, telling justices that the creation of the European Communities Act, which incorporates the European treaties into British law automatically, was designed not to create rights but to expedite the implementation of treaties, created through prerogative power. The government is arguing that Parliament, through silence, has accepted that all areas not defined as within its scope as prerogative powers. David Allen Green gives his verdict over at the FT.

MO’MENTUM, MO’PROBLEMS

The continuing acrimony in Momentum has once again burst out into the open after a fractious meeting to set the organisation’s rules and procedures, Jim Waterson reports over at BuzzFeed.  Jon Lansman, the organisation’s founder, still owns the data and has the ability to shut down the entire group, should he chose to do so, something he is being urged to do by allies. I explain the origins of the crisis here.

STOP ME IF YOU’VE HEARD THIS ONE  BEFORE

Italy’s oldest bank, Monte Paschi, may need a state bailout after its recapitalisation plan was thrown into doubt following Matteo Renzi’s resignation. Italy’s nervous bankers will wait to see if  €1bn of funds from a Qatari investment grouping will be forthcoming now that Renzi has left the scene.

BOOM BOOM

Strong growth in the services sector puts Britain on course to be the highest growing economy in the G7. But Mark Carney has warned that the “lost decade” of wage growth and the unease from the losers from globalisation must be tackled to head off the growing tide of “isolation and detachment”.

THE REPLACEMENTS

David Lidington will stand in for Theresa May, who is abroad, this week at Prime Ministers’ Questions. Emily Thornberry will stand in for Jeremy Corbyn.

QUIT PICKING ON ME!

Boris Johnson has asked Theresa May to get her speechwriters and other ministers to stop making jokes at his expense, Sam Coates reports in the Times. The gags are hurting Britain’s diplomatic standing, the Foreign Secretary argues.

AND NOW FOR SOMETHING COMPLETELY DIFFERENT

It’s beginning to feel a bit like Christmas! And to help you on your way, here’s Anna’s top 10 recommendations for Christmassy soundtracks.

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Stephen Bush is special correspondent at the New Statesman. His daily briefing, Morning Call, provides a quick and essential guide to British politics.