Why tax avoidance is like porn

I know it when I see it.

I know it when I see it.                                                                                                                                                        

Justice Potter Stewart of the US Supreme Court gave one of history's least fulfilling answers when he was asked to define "hard-core pornography"; but the grain of truth contained within is important.

The same temptation to throw one's hands up at the difficulty of defining complex phenomena is everywhere. The Economist's Daniel Knowles, for instance, suggests that it applies to poverty while the Sorites paradox – a close relative – attaches the problem to bald men and heaps of wheat.

It also applies, pretty much perfectly, to tax avoidance.

We all know it when we see it. Take, for example, Polly Toynbee's column from the Guardian today:

The big sell is trusts, special ones devised for this company's clients, guaranteed to protect almost all your wealth from inheritance tax. They are right, it can be done easily. Put all moveables and all cash and investments into a discretionary trust, and it passes to your heirs without tax as soon as you die, not even waiting for probate. It counts as a gift so the beneficiaries need pay no tax either. Called a "discretionary trust", as technically St James's are the legal trustees, the discretion in fact remains in all but name with you: the company will do whatever you ask, so you still control the fund and you can still take money from it. But for reasons that defy basic tax fairness, it avoids all inheritance tax. Why?

Or this example from the New Yorker back in March:

Since New York City tax laws don't apply to people who are deemed to be nonresidents, even if they own a residence in the city and work there, Robertson was allowed to spend no more than half a year – a hundred and eighty-three days – in New York City. This exile was self-imposed. If he had paid New York City tax, which in the top bracket reaches a rate of 3.6 per cent of taxable income, he could have spent as much time in the city as he wished...

Friday nights were particularly risky, since Robertson or his wife often had social events scheduled in the city. In order to "earn a tax day," as he put it, he usually left town on Friday before midnight, even if his wife stayed at the apartment. Robertson's driver had to be on alert: as long as they crossed the Queens border en route to Locust Valley by midnight, Robertson didn't have to "waste" a Saturday as a New York day. Even one minute of a day spent in the city counts as a day of residence. (Exceptions are made for people who are in transit from one destination outside the city to another – from Newark airport to Long Island, for example, or to LaGuardia for a flight.) Robertson said he never missed the midnight deadline, although when he couldn't get his driver or a limousine service in time he occasionally had to hail a cab. On one occasion, Robertson came back from a trip and found himself crossing into Manhattan at 11:45 P.M. That mistake cost him a full New York City day, which he could have avoided by whiling away fifteen minutes at the airport.

Or the three multinationals hauled up in front of the Public Accounts Committee, about whom Richard Murphy writes:

For Amazon things were much worse. Their rep could not justify how an order made in the UK for a product in a UK warehouse, shipped by UK staff through the UK post and with a bill enclosed printed in this country could somehow have anything to do with Luxembourg when so very obviously it hasn’t. Despite this he had the gall to claim tax must be paid where the economic substance of the deal is – even though Amazon does nothing of the sort…

Google tried harder but they had created one insurmountable obstacle for themselves. Their argument was profits should be taxed where they are earned and they said US technology drove their European profits. But for their admission that the payments made from Europe for that technology never reach the USA and instead get parked in tax-free Bermuda ended whatever shred of credibility they’d tried to create.

All of these things are as clearly tax avoidance as Reader's Wives is clearly pornography. The problem comes when you try to come up with a definition which encompasses all of these examples while not also covering whatever the taxation equivalent of Last Tango in Paris is.

You can try to define it as acting to deliberately minimise your tax take – but then, what is taking out an ISA? That is an action which is performed for no other reason than the tax benefits, but it's clearly not tax avoidance.

There must, then, be some definition of the spirit of the law. Loopholes in tax are put there for a reason, but sometimes that reason is tricky to specify completely. So, for example, the loophole that investment income in taxed less that earned income exists to encourage people to invest their money (which is good for growth) – but when hedge fund managers are payed through "carried interest", that gets classed as tax avoidance, because it is technically investment income, but hasn't actually required any investment from the people benefiting.

Unfortunately, that definition doesn't work either. The absence of VAT on books, for example, is to promote an educated, well-read population; but even though 1001 reasons Britain is shit doesn't do that, we don't call it tax avoidance.

The problem persists even if you just look at specific examples of avoidance. Multinational corporations, for instance, sometimes headquarter themselves in of tax havens. Other times, they leave their headquarters where they are, but manipulate their accounts so that it looks like all their profits come from tax havens. Tempting as it is, it's very tricky to come up with a catch-all definition of avoiding behaviour in this situation.

Is it "not paying tax where you are headquartered"? Or is it "not paying tax where the money is earned"? Or is it a third, "pretending money is earned in one place, when it's really earned in another one"? Or a fourth, "paying tax in a tax haven"? Or even just "operating out of a tax haven"?

Perhaps the real solution is to just stop trying. Call out egregious examples of tax avoidance, but resist the lure to dictate a full definition of the term. Make clear to those who set policy that building a tax code which is easily abused will result in protest, and that avoiding tax will result in bad press. But save definitions for the courts, because it's a fight which seems nearly impossible.

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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Inside Big Ben: why the world’s most famous clock will soon lose its bong

Every now and then, even the most famous of clocks need a bit of care.

London is soon going to lose one of its most familiar sounds when the world-famous Big Ben falls silent for repairs. The “bonging” chimes that have marked the passing of time for Londoners since 1859 will fall silent for months beginning in 2017 as part of a three-year £29m conservation project.

Of course, “Big Ben” is the nickname of the Great Bell and the bell itself is not in bad shape – even though it does have a huge crack in it.

The bell weighs nearly 14 tonnes and it cracked in 1859 when it was first bonged with a hammer that was way too heavy.

The crack was never repaired. Instead the bell was rotated one eighth of a turn and a lighter (200kg) hammer was installed. The cracked bell has a characteristic sound which we have all grown to love.

Big Ben strikes. UK Parliament.

Instead, it is the Elizabeth Tower (1859) and the clock mechanism (1854), designed by Denison and Airy, that need attention.

Any building or machine needs regular maintenance – we paint our doors and windows when they need it and we repair or replace our cars quite routinely. It is convenient to choose a day when we’re out of the house to paint the doors, or when we don’t need the car to repair the brakes. But a clock just doesn’t stop – especially not a clock as iconic as the Great Clock at the Palace of Westminster.

Repairs to the tower are long overdue. There is corrosion damage to the cast iron roof and to the belfry structure which keeps the bells in place. There is water damage to the masonry and condensation problems will be addressed, too. There are plumbing and electrical works to be done for a lift to be installed in one of the ventilation shafts, toilet facilities and the fitting of low-energy lighting.

Marvel of engineering

The clock mechanism itself is remarkable. In its 162-year history it has only had one major breakdown. In 1976 the speed regulator for the chimes broke and the mechanism sped up to destruction. The resulting damage took months to repair.

The weights that drive the clock are, like the bells and hammers, unimaginably huge. The “drive train” that keeps the pendulum swinging and that turns the hands is driven by a weight of about 100kg. Two other weights that ring the bells are each over a tonne. If any of these weights falls out of control (as in the 1976 incident), they could do a lot of damage.

The pendulum suspension spring is especially critical because it holds up the huge pendulum bob which weighs 321kg. The swinging pendulum releases the “escapement” every two seconds which then turns the hands on the clock’s four faces. If you look very closely, you will see that the minute hand doesn’t move smoothly but it sits still most of the time, only moving on each tick by 1.5cm.

The pendulum swings back and forth 21,600 times a day. That’s nearly 8m times a year, bending the pendulum spring. Like any metal, it has the potential to suffer from fatigue. The pendulum needs to be lifted out of the clock so that the spring can be closely inspected.

The clock derives its remarkable accuracy in part from the temperature compensation which is built into the construction of the pendulum. This was yet another of John Harrison’s genius ideas (you probably know him from longitude fame). He came up with the solution of using metals of differing temperature expansion coefficient so that the pendulum doesn’t change in length as the temperature changes with the seasons.

In the Westminster clock, the pendulum shaft is made of concentric tubes of steel and zinc. A similar construction is described for the clock in Trinity College Cambridge and near perfect temperature compensation can be achieved. But zinc is a ductile metal and the tube deforms with time under the heavy load of the 321kg pendulum bob. This “creeping” will cause the temperature compensation to jam up and become less effective.

So stopping the clock will also be a good opportunity to dismantle the pendulum completely and to check that the zinc tube is sliding freely. This in itself is a few days' work.

What makes it tick

But the truly clever bit of this clock is the escapement. All clocks have one - it’s what makes the clock tick, quite literally. Denison developed his new gravity escapement especially for the Westminster clock. It decouples the driving force of the falling weight from the periodic force that maintains the motion of the pendulum. To this day, the best tower clocks in England use the gravity escapement leading to remarkable accuracy – better even than that of your quartz crystal wrist watch.

In Denison’s gravity escapement, the “tick” is the impact of the “legs” of the escapement colliding with hardened steel seats. Each collision causes microscopic damage which, accumulated over millions of collisions per year, causes wear and tear affecting the accuracy of the clock. It is impossible to inspect the escapement without stopping the clock. Part of the maintenance proposed during this stoppage is a thorough overhaul of the escapement and the other workings of the clock.

The Westminster clock is a remarkable icon for London and for England. For more than 150 years it has reminded us of each hour, tirelessly. That’s what I love about clocks – they seem to carry on without a fuss. But every now and then even the most famous of clocks need a bit of care. After this period of pampering, “Big Ben” ought to be set for another 100 or so years of trouble-free running.

The Conversation

Hugh Hunt is a Reader in Engineering Dynamics and Vibration at the University of Cambridge.

This article was originally published on The Conversation. Read the original article.