I think it’s safe to assume that a tax reform plan will take a lot longer than Trump’s administration thinks, especially when his officials cannot agree on how the plan will work.

That’s exactly what happened when White House Budget Director Mick Mulvaney and Treasury Secretary Steven Mnuchin testified in front of two different Senate committees.

Mulvaney told the Senate Budget Committee that the “tax plan doesn’t bank on any revenue stemming from faster economic growth.” At the same time, Mnuchin told the Senate Finance Committee that the “tax plan will partly pay for itself with economic growth.”

Mitch Mulvaney

Let’s start with Mulvaney. Trump promised, “his plan would be a major tax cut.” Vice President Mike Pence even tweeted out that the president “will sign into law the most consequential tax cut in American history. From The Washington Examiner:

Under questioning Thursday from Sen. Sheldon Whitehouse, D-R.I., though, Mulvaney said instead that revenue would not be counted on to make the tax reform add up — a major change from previous administration statements about the tax plan.

“I’m aware of the accusations of double-counting, I do not believe we engaged in that,” Mulvaney said.

Whitehouse then said that, for Mulvaney’s statement to be true, the envisioned tax reform would have to maintain constant tax revenue, even without considering any new revenue from faster economic growth.

“We are agreeing on that point,” Mulvaney said. The administration assumed that the tax reform would be revenue-neutral, he said, simply because Trump officials had to choose an assumption for the purposes of putting together the budget and there are not enough details about the tax legislation to specify details.

So in other words, the plan cancels itself out:

Mulvaney’s statement Thursday, however, is that the Trump tax plan would lose zero in revenue. In effect, it wouldn’t be a tax cut at all. For every dollar lost through tax rate reductions, another dollar would have to be raised through eliminating deductions, credits and other breaks.

Steven Mnuchin

Mnuchin told the Senate Finance Committee that the administration’s “tax plan that will count partly on revenue from economic growth spurred by tax cuts and partly on revenue from limiting deductions and other tax breaks.”

However, he said “that it was too soon to know the details of any tax plan.” But he insisted that the plan “would be paid for with economic growth and base broadening” and promised “full transparency” once the administration knows the details.

In April, Mnuchin unveiled a one-page plan to tackle tax reform, which will provide economic growth. From CBS News:

While the details into just how the American taxpayer is expected to pay the estimated $7 trillion cost have yet to be ironed out, Mnuchin, speaking to “CBS This Morning,” says the cuts are going to be paid for by “economic growth and a reduction of many deductions in special interest.”

“We feel confident that we can get to at least 3 percent economic growth on a sustained basis,” said Mnuchin.

Mnuchin added, “The American economy has been held back and this is about unleashing economic growth. It’s a combination of the tax plan, it’s a combination of regulatory relief, and it’s a combination of our trade principles. And those three are what are going to create economic growth that’s been held back in this country.”

This growth will not happen overnight. From CNBC:

“In our projections it will probably take two years to get up to three percent growth and then we can have a sustained level. That’s what we’re projecting,” Mnuchin said. “Obviously the sooner we can pass taxes, the sooner we can get regulatory relief the better we’re going to be.”

“I think we can create what’s incredible economic growth in this country,” he said. The Treasury Secretary was speaking on stage in an interview with Maria Bartiromo of Fox Business News at the Milken Institute Global Conference in Los Angeles, California.