Denise Van Outen holds a cheque for Great Ormond Street Hospital. But can she claim back the tax? Credit: Getty
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How charitable tax deductions work

We've heard Osborne's plans to crack down on tax dodgers/ philanthropists (delete as appropriate), but what about higher rate payers and their charitable deductions?

The Financial Times is reporting that George Osborne is set to back down over proposals to limit the tax-deductability of charitable donations. The chancellor's planned cap on tax relief limited deductibles to the higher of 25 per cent of annual income or £50,000 per person, but the inclusion of relief given due to charitable donations in that cap sparked condemnation from all three parties and many charities.

As a result, Osborne is considering two new possibilities:

One plan is to have a separate limit on charitable donations of 50 per cent of a person’s income, allowing charities to claim tens of millions of pounds more in reliefs than under the current plan. Another is to let donors roll over any unused tax reliefs into future years if they are used for donations.

Treasury officials are locked in talks with representatives from the voluntary sector, and expect to make final decisions on how best to mitigate the effects of the planned cap in a few months. But they estimate raising the ceiling for charitable donations to 50 per cent would cost £40m, taking the overall savings from capping charities tax relief down to just £20m.

It is worth clarifying what the proposed changes are. Most of us are only aware of the most basic level of interaction between the tax system and charitable donations: gift-aid.

If a basic-rate taxpayer makes a donation, then a charity can claim back the tax paid on the money donated, boosting the value of the donation by 25 per cent (if the donor gives 80p, then the charity gets £1, which is the amount the donor had to earn to receive 80p post-tax income). There are no current plans to change that, and it has been an invaluable source of revenue for many charities.

If the donor is a higher- or top-rate taxpayer, however, tax relief kicks in for them as well as the charity. In addition to the 20 per cent gift aid, the donor can claim back the 20 or 30 per cent they paid on top of that, and count it against taxable income at the end of the year. So that 80p donation still earns the charity £1, but when the time comes to fill in their tax return, the donor won't have to pay more than basic rate tax on the money donated – they get 20 or 30p back. For a top rate taxpayer, that means that they are out-of-pocket by 50p, while the charity gets £1.

It is important to note that no-one makes money by donating to charity in this way. If the charity is a real one - and this whole affair was sparked because some people are apparently donating to bogus charities, which really is tax dodging - then the donor will always lose at least 50p in every pound the charity receives. It will indeed reduce the total tax they pay, but that reduction will necessarily be less than the amount they donate.

Despite that, there will be people using donations to avoid tax. It won't be rational, and it won't make them richer, but sometimes dodgers go to ludicrous lengths to not pay tax. Willard Foxton reported people "dodging VAT on cars by having them flown in at more cost than the tax". It is certainly believable that those who think like that would donate £2m to avoid paying £1m in tax; but it isn't going to be many.

Even for those who aren't donating out of blind desire to reduce their tax take, the cap will hit hard. Combined with other tax deductions, charitable donations may be enough to push the total tax-rate of a wealthy individual to less than 25 per cent. That is what is concerning charities. Under the proposed rules, the cost of donations to philanthropists with an already low tax rate will rise by 37.5 per cent. If donors react to that rise by donating less, then charities will be sorely hit.

The core issue at stake is whether or not charitable giving abdicates one's responsibility to pay for the machinery of state. On the one hand is the belief exemplified by Clement Atlee:

If a rich man wants to help the poor, he should pay his taxes gladly, not dole out money at a whim.

On the other hand is the belief that by donating to charity, one has fulfilled their responsibility to pay a "fair share".

In the real world the argument hasn't touched upon this morality much, if at all. Instead, the matter is presented in far starker terms; either a focus on "total tax rate" to the exclusion of the reasons why that rate might be low, or a focus on the total income of charities, to the exclusion of the source of that money.

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.