How do you pay $41m in taxes on a painting which can't be sold?

The value of a painting is how much you can sell it for. But Robert Rauschenberg's "Canyon" is illegal to sell, leaving the Sonnabend estate in a pickle.

When modern art dealer Ileana Sonnabend died in 2007, her family had to sell a heck of a lot of paintings to pay their inheritance tax bill. They eventually valued the total estate at $876m, and had to say goodbye to works by Lichtenstein, Warhol and Twombly to come up with the $471m they owned.

But one of the most important paintings they owned was valued at $0, in a move which has led to the IRS (the Internal Revenue Service, the American tax office) taking them to court for to reclaim a further $41m from them. But this is not tax evasion gone wrong. The painting is quite literally priceless – or perhaps more accurately, valueless.

The work, called Canyon, is by American pop artist Robert Rauschenberg. It is a mixed-medium canvas, featuring "oil, housepaint, pencil, paper, fabric, metal, buttons, nails, cardboard, printed paper, photographs, wood, paint tubes, mirror string, pillow" – and a stuffed bald eagle:

Since trafficking in the bird, a formerly endangered species and national icon, is illegal whether it is dead or alive, the painting cannot be resold. In fact, Sonnabend had to obtain special dispensation to lend the work to museums, and even keep it at all, once federal agents spotted it in 1981.

Now, as any economist knows, there is no such thing as intrinsic value. An item is worth what it can be resold for. It's value certainly isn't what you paid for it, as anyone who bought a full set of Charles and Diana wedding memorabilia will attest to. And neither is it what it would be in a different, hypothetical, situation. If I own an autographed copy of Sticky Fingers​ which will be worth a lot "when (if?) Keith Richards dies", that's all very well, but it's not worth that now.

All of which is to say that if you own a painting which cannot legally be sold, and which can only even be retained through a rarely competent bureaucratic exemption, it is pretty fair to describe it as worth $0. (Although a more accurate valuation would be [sale price in an open market]x[probability of the restrictions being lifted], but if the latter is zero then the whole thing is as well). But the IRS, apparently, don't agree. They claimed to the estate's lawyer that:

There could be a market for the work, for example, a recluse billionaire in China might want to buy it and hide it.

Yesterday, the New York Times threw some light on how they actually reached their valuation:

That figure came from the agency's Art Advisory Panel, which is made up of experts and dealers and meets a few times a year to advise the I.R.S.’s Art Appraisal Services unit. One of its members is Stephanie Barron, the senior curator of 20th-century art at the Los Angeles County Museum of Art, where "Canyon" was exhibited for two years. She said that the group evaluated "Canyon" solely on its artistic value, without reference to any accompanying restrictions or laws.

"The ruling about the eagle is not something the Art Advisory Panel considered," Ms. Barron said, adding that the work’s value is defined by its artistic worth. "It’s a stunning work of art and we all just cringed at the idea of saying that this had zero value. It just didn’t make any sense."

Reuters' economics blogger Felix Salmon, who harbours part time fascination with the art world, doesn't think too highly of Barron for this:

The assumptions baked in to this are both jaw-dropping and entirely unsurprising at the same time. Barron is the senior curator of 20th-century art at Lacma, which puts her at the pinnacle of the non-profit art world, the place where art is supposedly valued just for its own sake and not because it’s worth lots of money. And yet, faced with a literally priceless work of art, Barron and her fellow panelists “just cringed” at ratifying precisely that concept. If a work has great artistic value, in Barron’s view, it must have great financial value as well. And, conversely, if a work has no financial value, then it cannot have artistic value.

Salmon is right that there is something peculiarly specific to the art world in this error, and that's what he focuses on for the rest of his very good piece. But it's also representative of a more widespread form of economic illiteracy. Take, for example, arguments around the introduction of a wealth tax.

The idea is that since a) inequalities in wealth are far greater than inequalities in income, and b) wealth is a better indicator of "richness" than income (people rarely have temporary spikes in wealth, for instance), then we ought to be collecting a tax on wealth (of, say, half a per cent of total wealth over £1m per year).

This is all good, but the problem comes when people start comparing liquid and illiquid assets. Much – most – of the wealth of the richest Britons is tied up in land and property. Unless Inland Revenue want to start collecting percentages of houses (and it's unclear what they would do if they seized, say, your front porch) then some people are going to have to start selling those homes, liquidating their assents.

When there's a glut of properties on sale, the value falls. If the value falls, the value of what can be taxed correspondingly falls. There is no such thing as the "true" value of someone's wealth which the Revenue can address, and if they do, they end up with cock-ups like the IRS's. Let that be a lesson to them.

A noble, majestic bald eagle, indirectly responsible for a $41m tax bill. 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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Geoffrey Howe dies, aged 88

Howe was Margaret Thatcher's longest serving Cabinet minister – and the man credited with precipitating her downfall.

The former Conservative chancellor Lord Howe, a key figure in the Thatcher government, has died of a suspected heart attack, his family has said. He was 88.

Geoffrey Howe was the longest-serving member of Margaret Thatcher's Cabinet, playing a key role in both her government and her downfall. Born in Port Talbot in 1926, he began his career as a lawyer, and was first elected to parliament in 1964, but lost his seat just 18 months later.

Returning as MP for Reigate in the Conservative election victory of 1970, he served in the government of Edward Heath, first as Solicitor General for England & Wales, then as a Minister of State for Trade. When Margaret Thatcher became opposition leader in 1975, she named Howe as her shadow chancellor.

He retained this brief when the party returned to government in 1979. In the controversial budget of 1981, he outlined a radical monetarist programme, abandoning then-mainstream economic thinking by attempting to rapidly tackle the deficit at a time of recession and unemployment. Following the 1983 election, he was appointed as foreign secretary, in which post he negotiated the return of Hong Kong to China.

In 1989, Thatcher demoted Howe to the position of leader of the house and deputy prime minister. And on 1 November 1990, following disagreements over Britain's relationship with Europe, he resigned from the Cabinet altogether. 

Twelve days later, in a powerful speech explaining his resignation, he attacked the prime minister's attitude to Brussels, and called on his former colleagues to "consider their own response to the tragic conflict of loyalties with which I have myself wrestled for perhaps too long".

Labour Chancellor Denis Healey once described an attack from Howe as "like being savaged by a dead sheep" - but his resignation speech is widely credited for triggering the process that led to Thatcher's downfall. Nine days later, her premiership was over.

Howe retired from the Commons in 1992, and was made a life peer as Baron Howe of Aberavon. He later said that his resignation speech "was not intended as a challenge, it was intended as a way of summarising the importance of Europe". 

Nonetheless, he added: "I am sure that, without [Thatcher's] resignation, we would not have won the 1992 election... If there had been a Labour government from 1992 onwards, New Labour would never have been born."

Jonn Elledge is the editor of the New Statesman's sister site CityMetric. He is on Twitter, far too much, as @JonnElledge.