The IMF also increased 2017 growth projections for a number of other countries including China, Germany, Japan and Britain, but warned that the global economy faced a number of downside risks including rising protectionist trade pressures.
The 189-nation global lending agency's latest economic outlook, released today, took note of the significant impact Trump's election has already had in giving a boost to US stock prices, interest rates and the dollar.
The new outlook puts US economic growth at 2.3 per cent this year and 2.5 per cent in 2018. That would be an improvement from lackluster US growth around 1.6 per cent in 2016.
The new forecast represented a boost of 0.1 percentage point for 2017 compared to the IMF's last forecast released in October and an even bigger boost of 0.4 percentage point for 2018, reflecting an expectation that Trump's program will take time to be implemented.
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For the overall global economy, the IMF left its projections unchanged growth of 3.4 per cent for this year and 3.6 per cent for 2018, both up from 3.1 per cent growth in 2016, a year when global growth slowed to its weakest performance since the 2008-2009 financial crisis.
"The global economic landscape started to shift in the second half of 2016," IMF chief economist Maurice Obstfeld said, helped by a rebound in manufacturing activity in many countries and the financial market rally that started with Trump's November election victory.
But Obstfeld said there was a wider than usual range of
upside and downside risks in part because of the uncertainty over how much of Trump's program will win congressional approval.
The new outlook boosted the growth forecast for China, the world's second largest economy, to 6.5 per cent this year, up 0.3 percentage point from the October forecasts based on expectations the Chinese government will continue providing stimulus.
The outlook also boosted 2017 growth projections for Germany, Japan, Spain and Britain to reflect stronger-than-expected performances in the second half of last year.
The IMF said that growth prospects in Latin America were being hurt by rising uncertainty about the outlook in Mexico, given the comments Trump made during the election about the need to overhaul trade relations between the United States and Mexico.
Obstfeld said that among the risks facing the global economy at the moment were "higher popular antipathy toward trade, immigration and multilateral engagement" among voters in the United States and Europe.