The Department of FInance has said that income tax receipts remain weak, despite a stabilisation of the public finances.
Exchequer figures for the first six months of the year published this evening show an improvement of almost €6bn compared to this time last year.
Broadly the tax take is on target as set out on Budget Day last December. The shortfall is about €227m.
VAT and corporation tax returns have performed better, but there is concern that income tax is 5.8% - about €300m - below target. This is a sign that people are still losing their jobs, working fewer hours, and for less money.
Finance officials say there also may be an element of a black economy, but that this is just speculation.
Minister for Finance Brian Lenihan said his overall target for the full year to take in €31bn in taxes remains achievable.
The Government needs €51bn to run the country, so about €20bn will have to be borrowed.