He correctly called Dow 24,000, and now longtime bull Jeremy Siegel sees another milestone approaching

  • Wharton's finance professorJeremy Siegel expects tax reform will boost the Dow to 25,000 and corporate earnings by 8 percent.
  • Political uncertainty and inflation fears could increase stock market volatility in 2018, Siegel says.

The Wharton School's Jeremy Siegel isn't putting on a bear suit anytime soon.

The finance professor who just correctly predicted Dow 24,000 sees another milestone approaching.

"As we get to these thousands, of course, each is a smaller increment. I think right now, we're only three percent from 25 – the next thousand on the Dow," Siegel said Friday on CNBC's "Trading Nation."

Siegel has had a solid track record over the past 12 months. He led the rally cry for Dow 20,000 late last year.

He expects the next leg higher to Dow 25,000 will to come from the tax reform package. It could provide the momentum the Dow needs to hit that number in a matter of weeks, if not days, according to Siegel.

His comments came as the Senate narrowly passed a $1.4 trillion tax bill. On Saturday morning, Senate Republicans voted to overhaul the American tax system with a 51-49 vote, the passage of which included a whopping corporate tax cut that lowers the current rate from 35 percent to 20 percent.

"The corporate tax cut is particularly what I think the market wants," Siegel told CNBC. That could boost earnings by 8 percent or so, and that's a positive for stocks."

Even though Siegel expects stocks to rise another three percent in the near term, he predicts the returns will slow in 2018 to about 5 to 10 percent.

"It's my expectation next year is not going to be anywhere as easy as this year in the markets," he said. "We're moving up to full valuation. It doesn't mean that means there's going to be a break in the market, a bear market or anything like that. But what are you up -- 15 to 20 percent or more this year? That'll be harder to come by in the future."

He points out headwinds stemming from inflation and political uncertainty could create downward pressure and add volatility to the stock market in 2018, which has been largely absent this year.

Another wild card is the Federal Reserve's monetary policy, Siegel suggested.

"Is the Fed going to be much more aggressive as that unemployment rate keeps on going down? Will they have to tighten? And that will definitely put a pause," Siegel said. "How will the Republicans do in the midterm elections? Will they hold the Senate? Will they hold the House? That's why it's more urgent go get what you think is right done now."

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Trading Nation is a multimedia financial news program that shows investors and traders how to use the news of the day to their advantage. This is where experts from across the financial world – including macro strategists, technical analysts, stock-pickers, and traders who specialize in options, currencies, and fixed income – come together to find the best ways to capitalize on recent developments in the market. Trading Nation: Where headlines become opportunities.

Sara Eisen

Sara Eisen joined CNBC in December 2013 as a correspondent, focusing on the global consumer. She is co-anchor of the 10AM ET hour of CNBC's "Squawk on the Street" (M-F, 9AM-11AM ET), broadcast from Post 9 at the New York Stock Exchange.

In March 2018, Eisen was named co-anchor of CNBC's "Power Lunch" (M-F, 1PM-3PM ET), which broadcasts from CNBC Global Headquarters in Englewood Cliffs, N.J.

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