As provided for in Budget 2012, from September 2012, new rate bands for State pension (contributory) were introduced. This resulted in one of the bands (in respect of those with a yearly average of 20-47 contributions) being replaced with three bands (in respect of yearly averages of 40-47, 30-39, and 20-29 respectively). These additional bands more accurately reflect the social insurance history of a person and ensure that those who contribute more during a working life are likely to benefit more in retirement than those with lesser contributions.
It is estimated that the cost of reverting to the rate-bands which existed between 2000 and 2012 would be over €60 million in 2018, if introduced from January 2018, and that this annual cost would rise at a rate of some €10 million each year.
I hope this clarifies the matter for the Deputy.