Think-tank The Nevin Economic Research Institute (Neri) has said there is no scope for cutting taxes in next October's budget.
This is due to the already low levels of Government spending and strained public services.
Neri has also branded government plans for a 50:50 split in Budget 2016 between spending increases and tax cuts as inappropriate.
In its latest assessment of the economy, the trade union-funded think-tank said long term economic growth, employment and equity goals could be achieved by boosting public capital investment levels.
“In addition, we argue for a modest increase in social spending funded by a set of growth-friendly reforms to increase total government revenue,” Neri said.