WASHINGTON — The Federal Reserve raised interest rates on Wednesday but left its rate outlook for the coming years unchanged even as policy makers projected a short-term jump in US economic growth from the Trump administration鈥檚 proposed tax cuts.

In an early verdict on the tax overhaul, Fed policy makers judged it would boost the economy next year but leave no lasting impact, with the long-run potential growth rate stalled at 1.8%. The White House has frequently said its tax plan would produce annual GDP growth of 3-4%.

The expected fiscal stimulus, coming on the heels of relatively bullish data, cleared the way for the US central bank to raise rates by a quarter of a percentage point to a range of 1.25% to 1.50%. It was the third rate hike this year.

But the Fed鈥檚 forecast of three additional rate increases in 2018 and 2019 was unchanged from its projections in September, a sign the tax legislation moving through Congress would have a modest, possibly fleeting, effect.

The rate increase represented a victory for a central bank that has struggled at times to deliver on its promised pace of monetary tightening. It also allowed Fed Chair Janet Yellen, at her final press conference before her term ends in February, to signal an all-clear for the US economy a decade after the onset of the 2007-2009 recession. 鈥淎t the moment, the US economy is performing well. The growth that we鈥檙e seeing, it鈥檚 not based on, for example, an unsustainable buildup of debt鈥 The global economy is doing well, we鈥檙e in a synchronized expansion,鈥 Ms. Yellen said. — Reuters

鈥淭here is less to lose sleep about now than has been true for quite some time, so I feel good about the economic outlook.鈥

But the central bank鈥檚 projections also contained some potential dilemmas for incoming Fed chief Jerome Powell.

The Fed now envisions a burst of growth, ultra-low unemployment of below four percent in 2018 and 2019 and continued low interest rates — yet little movement on inflation. Ms. Yellen said the persistent shortfall of inflation from the Fed鈥檚 two percent goal was the major piece of 鈥渦ndone work鈥 she was leaving for Mr. Powell to figure out.

In its justification for Wednesday鈥檚 rate increase, which was widely expected by financial markets, the Fed鈥檚 policy-setting committee cited 鈥渟olid鈥 economic growth and job gains.

US stocks extended gains after the release of the policy statement before ending mixed, while Treasury yields dropped. The dollar fell against a basket of currencies.

Traders of US short-term interest rate futures kept bets the Fed would raise rates only twice next year.

The Fed now sees gross domestic product growing 2.5% in 2018, up from the 2.1% forecast in September. The pace of growth is expected to cool to 2.1% in 2019, slightly higher than the prior forecast of 2.0%.

鈥淐hanges in tax policy will likely provide some lift to economic activity in coming years,鈥 Ms. Yellen said, adding that 鈥渢he magnitude and timing of the macroeconomic effects of any tax package remain uncertain.鈥

The impact would 鈥渕ainly鈥 work to raise aggregate demand as households and companies have more money to spend, Ms. Yellen said, with 鈥渟ome potential鈥 to raise investment and the economy鈥檚 longer-term growth.

The Fed also said on Wednesday it expected the nation鈥檚 unemployment rate would fall to 3.9% next year and remain at that level in 2019, well below what is considered to be full employment.

It previously had forecast a jobless rate of 4.1% for those two years.

But inflation is projected to remain shy of the central bank鈥檚 goal for another year, with weakness on that front still enough of a concern that policy makers saw no reason to accelerate the expected pace of rate increases.

鈥淚t shows at least some members of the Fed don鈥檛 see any reason to keep hiking rates in an environment where the economy is growing more strongly but certainly not overheating and where inflation hasn鈥檛 become a problem and doesn鈥檛 look like it is going to be one,鈥 said Kate Warne, investment strategist at Edward Jones.

Policy makers do see the federal funds rate rising to 3.1% in 2020, slightly above the 2.8% 鈥渘eutral鈥 rate they expect to maintain in the long run. That indicates possible concerns about a rise in inflation pressures over time Chicago Fed President Charles Evans and Minneapolis Fed President Neel Kashkari dissented in the policy statement on Wednesday. — Reuters