The UK government has decided to go ahead with a rise in corporation tax in April 2023. The move is a clear reversal of the tax reduction which previous chancellors hoped would encourage output and innovation.

The idea of lowering corporation tax to boost growth (and ultimately tax revenue) failed spectacularly under Liz Truss's short-lived premiership. And as the current chancellor Jeremy Hunt explained in his recent budget: "Even at 19%, our corporation tax regime did not incentivise investment as effectively as countries with higher headline rates."

In raising corporation tax to 25%, the government has conceded that companies have not been investing productively. Despite corporation tax rates falling to 19% from 28% in 2010, and historically low borrowing costs (with interest rates close to zero to help businesses recover from the 2008 global financial crisis), business investment took until 2016 to recover to its pre-crisis share of GDP, which was already low in comparison to the EU.

Corporate Britain preferred to either save its profits, or pay out dividends to shareholders, revealing four deep rooted structural problems behind the UK's growth problem.

1. Profits don't guarantee more investment

Research shows that larger firms in the UK are more cautious about any boost in profits, compared to their counterparts in the EU. It takes an unusually large profit boost to give them an incentive to invest.

Investment may also be depressed by the increase in the number of firms whose profit relies on securing intellectual property rights, particularly in sectors like pharmaceuticals and software, where these are strongly protected. As these rights raise profits by restricting access to the market to new products, they can lessen the incentive for companies to invest in more production.

It is an extension of what's known as the "innovators' dilemma", where market leaders hesitate over developing new products that could take away sales and profits from their current range.

Business strategists often advise that when capital costs are unusually low - as in the UK's low interest rate phase from 2008 to 2020 - it's best to lessen the focus on profit and instead go for growth. But with interest rates now rising, much of UK plc has left it too late.

2. Higher investment hasn't driven faster growth

In 2016, when UK business investment finally recovered to levels similar to those before the 2008 financial crisis (around 10% of GDP), growth didn't pick up as conventional forecast models had expected.

Trends are worsening further as the recovery from the devastating impact of COVID stalls. One cause appears to be what's referred to as "financialisation": when non-financial firms chase profit through financial and real estate investment, instead of spending on more productive new equipment and innovation. But this is often risky when interest rates rise or asset prices fall.

3. Defending profits can fuel inflation

Ministers and the Bank of England have urged employees to keep pay rises below inflation, to avoid a "wage push" that might keep inflation high. Though many protested in an ongoing strike wave, on the whole, wages have not matched inflation. In the year to January employees got an average wage rise of 7% in the private sector and just 4.8% in the public, compared to consumer price inflation of 10.1%.

In contrast, the speed with which companies raised prices to match (or even exceed) their rise in costs, suggests the "profit push" has been stronger than any wage push in driving inflation upwards.

UK firms have done better than their employees at protecting income against the rising cost of living. But because they won't return the favour, and invest to improve productivity and let wages rise, the chancellor has chosen to tax those profits more and spend the proceeds himself.

4. Public investment needs a kick-start

Chancellors since 2014 have done well to avoid the mistake of letting public investment fall when private investment is still subdued after a crisis.

But current fiscal targets designed to stabilise UK public debt inevitably mean a squeeze on public projects (outside healthcare and defence where increases have been pledged). The latest OBR forecasts show general government fixed investment slowing from 12.3% growth this year to just 0.4% in 2024, followed by falls of 3.3%, 1.1% and 1.4% in the years that follow.

This squeeze is being worsened by the runaway costs of HS2, now more than twice its original Pound 33 billion projection, and other over-budget mega-projects such as Hinckley Point C, which take funds from more prosaic outlays on crumbling transport, energy, education and healthcare infrastructure.

The government's spring budget envisages central government co-investing in emerging technologies such as artificial intelligence, carbon capture and small nuclear reactors. But under its self-imposed investment restrictions, the state will struggle to fund its new entrepreneurial role. And the current government's desire to be seen as "pro-business" cannot hide its profound irritation that the private sector didn't step up its investment performance while the funds were still flowing freely.

Author: Alan Shipman - Senior Lecturer in Economics, The Open University