Hamish McRae, the Independent’s economic guru, has a particular gift of spotting trends well before his peers. Some weeks ago he looked at the numbers in self-employment and returned to this theme last week. The current rise in the self employed began in 2000, ie. while we were still basking in the warm glow of the longest boom the country has ever known. Two years ago there were 3,873,000 people listed as self-employed. That total now stands at 4,131,000.

How should we interpret this dramatic data?

These figures are not the only piece of good news in the last employment trends for MPs concerned about the impact of unemployment on their constituents. Hamish points out that private sector employment seems to be growing at around the same pace as the fall in public sector jobs, but many of these new jobs are part time and we have no way of telling yet from these figures if this is a trend welcomed by the workforce or whether it is a Hobson’s choice. Nor is it known if the unemployed are being pushed into working for themselves, or whether something new is at work.

Hamish suggests that this trend in self-employment might well be permanent. He goes further, supposing the trend in public employment, down from 6.3 million two years ago to 5.9 million, continues along the line predicted by the coalition’s public expenditure projections, with self-employment crossing at about the five million mark. Is it not unreasonable to begin planning for a world where, in five years, there are more people in self-employment than are employed in the public sector.

Such a world would politically be very different from the world Mrs Thatcher left for her successors. It could have a profound impact on our politics and immediately on welfare and taxation. Let me simply concentrate on how this trend could ricochet onto the tax status quo.

It is no secret that the self-employed somehow manage to pay a lower proportion of their income in direct taxation than those of us on PAYE. What challenge does this hold for any government anxious to balance the books? In each year since 2002-3 spending has outstripped revenue as a proportion of GDP. Hence the growing debt.

If we politicians want an adequate revenue to finance even a slimline election manifesto, and yet our certain revenue raising base through PAYE is declining, will we not need to think the unthinkable on tax? What forms of taxation make it difficult for richer people to avoid, let alone evade?

In the postwar period the most elegant advocate of a tax on wealth and consumption was James Meade. A party trying to position themselves ahead of the curve would not only be searching the web for copies of Meade’s work, but would then begin a serious enquiry into how best a shift in the tax base could be engineered and over what period of time.

Over to you Ed. It is never too early to begin work on the details and preparing public opinion.

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Frank Field is MP for Birkenhead and former minister for welfare reform

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Photo: Elias Schwerdtfeger