The Finance Minister says projects like Dublin Metrolink, could be deferred because of reasons beyond his control.
The Department of Finance predicts the economy will shrink by 10.5 per cent this year and unemployment could hit 22 per cent.
There will be a recovery in 2021 with a 5.5 per cent increase in employment - but the economy will not return to where it was at the start of this year until 2022.
The predictions are based on restrictions lasting for three months - and GDP could fall by as much as 15 per cent if they last until the end of the year.
