Trump administration explains details of how tax plan would pay for itself, immediately gets attacked for assumptions

 In U.S.
Treasury Secretary Steven Mnuchin spoke with Republican senators on Nov. 7 about the push for tax reform. “Nothing is more important to the president’s agenda than tax reform and tax cuts,” he said. (Reuters)

For months, Treasury Secretary Steven Mnuchin has said that the Republican tax plan wouldn’t add a penny to the national debt, pledging that more than 100 people in his agency were “working around the clock” to calculate how much additional growth would come from the plan. On Monday, the Treasury Department released the fruit of those efforts: a one-page document asserting that the $1.5 trillion tax plan would generate more than enough to pay for itself.

The analysis relies on two big — and controversial — assumptions: that it will generate economic activity well in excess of what independent analysts project, and that the rest of the administration’s economic agenda, including regulatory reform, infrastructure spending and an overhaul of the welfare system, will take effect.

Treasury assumes the U.S. economy will grow 2.9 percent every year for the next 10 years (based on Office of Management and Budget figures), a large increase from the 1.9 percent per-year growth that the nonpartisan Congressional Budget Office is projecting.

“One percentage point of higher growth sounds like a little bit, but it’s the equivalent of me being one foot taller and able to dunk a basketball,” says Mark Mazur, an economist who served as assistant secretary for tax policy at the Treasury during the Obama administration.

Treasury says half of the increased growth would come from the massive cuts to business taxes. The tax plan proposes cutting the corporate rate from 35 percent to 20 percent.

The office attributes the rest of the increased growth to multiple factors, including some that have yet to happen and are not part of the tax bill. As the one-page analysis says, “We expect the other half to come from changes to pass-through taxation and individual tax reform, as well as a combination of regulatory reform, infrastructure development and welfare reform as proposed in the [Trump] Administration’s Fiscal Year 2018 budget.”

Treasury estimates that, all told, the tax code changes and other policy efforts would lift economic growth so much that it would generate $1.8 trillion in new revenue over 10 years, as a bigger economy leads to bigger tax bills.

It is an analysis far different from other groups.

A recent analysis by the Joint Committee on Taxation (JCT), Congress’s nonpartisan scorekeeper, predicted that the Senate tax bill would add about 0.1 percent more a year to growth over the next decade, far less than what Treasury says. JCT took into account the economic effects of the tax cuts on individual and business taxes, but not other policy changes advocated by the administration, such as welfare reform.

The JCT says the Senate bill’s total cost would be $1 trillion after considering growth effects. JCT found almost exactly the same result when it analyzed the House bill and its economic impact: It would boost growth a little, but not nearly enough to cover the entire $1.5 trillion price tag. The House bill would also end up costing $1 trillion, JCT said in a new report out Monday afternoon.

Many economists and tax policy experts slammed the Treasury memo as half-baked. There was no supporting documentation with the statement, making it impossible for independent economists to be able to re-create Treasury’s work. Independent analysts have forecast that the bill would add $500 billion to nearly $2 trillion to the debt.

“Treasury has released a one-page [analysis] which will be used by tax cut advocates to claim that the tax cut pays for itself. It’s a joke and no substitute for the career staff running the full macro model they have to analyze effects,” New York University tax law professor David Kamin tweeted.

Some economists in the Obama administration don’t think Treasury ran a model at all. They note that the 2.9 percent growth estimate is what President Trump’s budget assumed in the spring. A Treasury spokesperson confirmed that the 2.9 percent figure is from the Office of Management and Budget, not any Office of Tax Policy modeling.

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