The Government is being accused of overestimating the savings made under the Croke Park deal.
According to a report in today's Sunday Business Post, the savings which the Government claims to have made on retiring public servants salaries, have been "inflated".
It said the Government's method for calculating savings adds 25% to 30% to the salary of each retiring public servant, before adding 40% of that figure as a "non-pay saving".
The Government said the method is satisfactory and accounts for savings to pension contributions, and the savings of not having to hire a replacement.
It said the agreement has saved €1.5bn over the past two years.