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.

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Why the Liberal Democrats by-election surge is not all it seems

The Lib Dems chalked up impressive results in Stoke and Copeland. But just how much of a fight back is it?

By the now conventional post-Brexit logic, Stoke and Copeland ought to have been uniquely inhospitable for the Lib Dems. 

The party lost its deposit in both seats in 2015, and has no representation on either council. So too were the referendum odds stacked against it: in Stoke, the so-called Brexit capital of Britain, 70 per cent of voters backed Leave last June, as did 62 per cent in Copeland. And, as Stephen has written before, the Lib Dems’ mini-revival has so far been most pronounced in affluent, Conservative-leaning areas which swung for remain. 

So what explains the modest – but impressive – surges in their vote share in yesterday’s contests? In Stoke, where they finished fifth in 2015, the party won 9.8 per cent of the vote, up 5.7 percentage points. They also more than doubled their vote share in Copeland, where they beat Ukip for third with 7.3 per cent share of the vote.

The Brexit explanation is a tempting and not entirely invalid one. Each seat’s not insignificant pro-EU minority was more or less ignored by most of the national media, for whom the existence of remainers in what we’re now obliged to call “left-behind Britain” is often a nuance too far. With the Prime Minister Theresa May pushing for a hard Brexit and Labour leader Jeremy Corbyn waving it through, Lib Dem leader Tim Farron has made the pro-EU narrative his own. As was the case for Charles Kennedy in the Iraq War years, this confers upon the Lib Dems a status and platform they were denied as the junior partners in coalition. 

While their stance on Europe is slowly but surely helping the Lib Dems rebuild their pre-2015 demographic core - students, graduates and middle-class professionals employed in the public sector – last night’s results, particularly in Stoke, also give them reason for mild disappointment. 

In Stoke, campaign staffers privately predicted they might manage to beat Ukip for second or third place. The party ran a full campaign for the first time in several years, and canvassing returns suggested significant numbers of Labour voters, mainly public sector workers disenchanted with Corbyn’s stance on Europe, were set to vote Lib Dem. Nor were they intimidated by the Brexit factor: recent council by-elections in Sunderland and Rotheram, which both voted decisively to leave, saw the Lib Dems win seats for the first time on massive swings. 

So it could well be argued that their candidate, local cardiologist Zulfiqar Ali, ought to have done better. Staffordshire University’s campus, which Tim Farron visited as part of a voter registration drive, falls within the seat’s boundaries. Ali, unlike his Labour competitor Gareth Snell and Ukip leader Paul Nuttall, didn’t have his campaign derailed or disrupted by negative media attention. Unlike the Tory candidate Jack Brereton, he had the benefit of being older than 25. And, like 15 per cent of the electorate, he is of Kashmiri origin.  

In public and in private, Lib Dems say the fact that Stoke was a two-horse race between Labour and Ukip ultimately worked to their disadvantage. The prospect of Nuttall as their MP may well have been enough to convince a good number of the Labour waverers mentioned earlier to back Snell. 

With his party hovering at around 10 per cent in national polls, last night’s results give Farron cause for optimism – especially after their near-wipeout in 2015. But it’s easy to forget the bigger picture in all of this. The party have chalked up a string of impressive parliamentary by-election results – second in Witney, a spectacular win in Richmond Park, third in Sleaford and Copeland, and a strong fourth in Stoke. 

However, most of these results represent a reversion to, or indeed an underperformance compared to, the party’s pre-2015 norm. With the notable exception of Richmond’s Sarah Olney, who only joined the Lib Dems after the last general election, these candidates haven’t - or the Lib Dem vote - come from nowhere. Zulfiqar Ali previously sat on the council in Stoke and had fought the seat before, and Witney’s Liz Leffman and Sleaford’s Ross Pepper are both popular local councillors. And for all the excited commentary about Richmond, it was, of course, held by the Lib Dems for 13 years before Zac Goldsmith won it for the Tories in 2010. 

The EU referendum may have given the Lib Dems a new lease of life, but, as their #LibDemFightback trope suggests, they’re best understood as a revanchist, and not insurgent, force. Much has been said about Brexit realigning our politics, but, for now at least, the party’s new normal is looking quite a lot like the old one.