International monetary fund (IMF) has projected global growth at 4.9% in 2020, which is 1.9% below the April 2020 World Economic Outlook forecast. In 2021, global growth is forecasted at 5.4%. Thus, in 2021 GDP is projected to be ~ 6.5% below pre-COVID-19 projections of January 2020.
As with the April 2020 World Economic Outlook, the extent of uncertainty is higher than usual than the projection. As per IMF, the baseline projection rests on important assumptions pertaining to the fallout from the pandemic.