Congressional report finds higher tax rates don't hurt growth, so Republican party has it pulled

"Changes in the top marginal tax rate do not appear correlated with growth."

A new report from the US's Congressional Research Service has been suppressed by Republicans after it concluded that tax rates are uncorrelated with economic growth or saving, investment, and productivity growth – but do affect the extent of income inequality in the nation.

The report concludes:

The top income tax rates have changed considerably since the end of World War II. Throughout the late-1940s and 1950s, the top marginal tax rate was typically above 90%; today it is 35%. Additionally, the top capital gains tax rate was 25% in the 1950s and 1960s, 35% in the 1970s; today it is 15%. The average tax rate faced by the top 0.01% of taxpayers was above 40% until the mid-1980s; today it is below 25%. Tax rates affecting taxpayers at the top of the income distribution are currently at their lowest levels since the end of the second World War.

The results of the analysis suggest that changes over the past 65 years in the top marginal tax rate and the top capital gains tax rate do not appear correlated with economic growth. The reduction in the top tax rates appears to be uncorrelated with saving, investment, and productivity growth. The top tax rates appear to have little or no relation to the size of the economic pie.

However, the top tax rate reductions appear to be associated with the increasing concentration of income at the top of the income distribution. As measured by IRS data, the share of income accruing to the top 0.1% of U.S. families increased from 4.2% in 1945 to 12.3% by 2007 before falling to 9.2% due to the 2007-2009 recession. At the same time, the average tax rate paid by the top 0.1% fell from over 50% in 1945 to about 25% in 2009. Tax policy could have a relation to how the economic pie is sliced—lower top tax rates may be associated with greater income disparities.

The report is particularly important for its treatment of capital gains tax as well as just income tax. The former is significantly lower than the latter, and has been for all but three years of the US's post-WWII history. As a result, it is a significant avenue for tax avoidance.

The argument for keeping capital gains tax low is that it stimulates investment, by encouraging people to invest rather than spend income. If, as the report concludes, it is in fact unconnected with investment rates, then that method of tax-dodging could be closed without harming the economy much, if at all.

The report, which was written by a neutral government body, was not welcomed by the Republican party, which is opposed to much taxation. The New York Times' Jonathan Weisman writes:

Senate Republican aides said they had protested both the tone of the report and its findings. Aides to Mr. McConnell presented a bill of particulars to the research service that included objections to the use of the term “Bush tax cuts” and the report’s reference to “tax cuts for the rich,” which Republicans contended was politically freighted.

They also protested on economic grounds, saying that the author, Thomas L. Hungerford, was looking for a macroeconomic response to tax cuts within the first year of the policy change without sufficiently taking into account the time lag of economic policies. Further, they complained that his analysis had not taken into account other policies affecting growth, such as the Federal Reserve’s decisions on interest rates.

“There were a lot of problems with the report from a real, legitimate economic analysis perspective,” said Antonia Ferrier, a spokeswoman for the Senate Finance Committee’s Republicans. “We relayed them to C.R.S. It was a good discussion. We have a good, constructive relationship with them. Then it was pulled.”

The Republican congressional leadership. 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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Jeremy Corbyn's speech on terrorism will do him more good than harm

The Labour leader's criticism of police cuts and western foreign policy will resonate with voters.

The election campaign, if there was any doubt, has resumed. In his speech responding to the Manchester attack, Jeremy Corbyn did not limit himself to expressions of sympathy and solidarity. He squarely targeted Theresa May on her home turf: policing and security.

The Conservatives' repeated warning is that Corbyn is a "threat" to his country. But the Labour leader countered that only he could keep it "safe". Austerity, he declared, "has to stop at the A&E ward and at the police station door. We cannot be protected and cared for on the cheap." May, having been warned by the Police Federation while home secretary of the danger of cuts, is undoubtedly vulnerable on this front. Under Labour, Corbyn vowed, "there will be more police on the streets" (despite Diane Abbott's erroneous arithmetic), while the security services would receive whatever resources they need.

Corbyn swiftly progressed to foreign policy, the great passion of his political life. Though it is facile to reduce terrorism to a "blowback" against western interventionism (as if jihadists were Pavlovian dogs, rather than moral agents), it is blinkered to dismiss any connection. As Corbyn noted: "Many experts, including professionals in our intelligence and security services have pointed to the connections between wars our government has supported or fought in other countries, such as Libya, and terrorism here at home" (the Tory-led Foreign Affairs Select Committee is among those who agree).That the former Stop the War chair has long taken this view absolves him of the charge of crude political opportunism.

Corbyn was also more careful than his pre-briefed remarks suggested to caveat his criticisms. He emphasised: "Those causes certainly cannot be reduced to foreign policy decisions alone. Over the past fifteen years or so, a sub-culture of often suicidal violence has developed amongst a tiny minority of, mainly young, men, falsely drawing authority from Islamic beliefs and often nurtured in a prison system in urgent need of resources and reform.

"And no rationale based on the actions of any government can remotely excuse, or even adequately explain, outrages like this week’s massacre."

But he maintained his central charge: western intervention has made the world more dangerous, not less. "We must be brave enough to admit the war on terror is simply not working," he said. "We need a smarter way to reduce the threat from countries that nurture terrorists and generate terrorism."

Though Corbyn's arguments have appalled Conservatives (and some in Labour), they are ones that will likely find favour among the public. Polls have consistently shown that most voters oppose western adventurism and believe it has endangered the UK. Corbyn's words will resonate among both the anti-interventionist left and the isolationist right (this is, after all, a country which has just voted to retreat from even its closest neighbours).

The speech, given at 1 Great George Street (in the room where Ed Miliband gave his resignation address), was marred by Corbyn's refusal to take questions. But it was unarguably well-delivered. "Let’s have our arguments without impugning anyone’s patriotism and without diluting the unity with which we stand against terror," he warned in a pre-emptive strike against the Conservatives.

Corbyn's decision to give an overtly political speech four days after the Manchester attack is being widely described as a "gamble" or even a profound error. But the election will now rightly focus more closely on the issue of security - nothing should be beyond democratic debate.

Many of Corbyn's life-long stances, such as unilateral disarmament, do not find favour with the electorate. But there was little in his speech today that the average voter would contest. The Conservatives will hope to turn the heightened security debate to their advantage, ruthlessly quoting Corbyn against himself. But on this front, as on others, the Labour leader is proving a tougher opponent than they anticipated.

George Eaton is political editor of the New Statesman.

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