But it also stressed that it would still take years before Britain's economy fully recovered from the effects of the 2008 collapse.
In its new World Economic Outlook, the IMF said it now expected the UK to see growth of 1.4% this year and 1.9% in 2014 compared to its last forecast in July of 0.9% growth in 2013 and 1.5% next year. The watchdog said it now expected global growth of 2.9% this year, down 0.3% from July's estimate while in 2014 it forecast global growth of 3.6%, down 0.2%.
The Deputy Prime Minister said: "The IMF has doubled its forecast for UK growth this year and further raised its predictions for 2014. Crucially, since July, the UK forecast has improved above all other G7 countries as our industries forge ahead in global markets."
Chancellor George Osborne said the upgrade showed "our economic plan is working" but noted how the watchdog continued to warn of the global risks.
His Labour Shadow Ed Balls said it was right to warn that the UK economy would be "below potential" for many years to come.