The Taoiseach has said that negotiations on Ireland's corporate tax rate are "not complete at all" and "far more detail" is required about the OECD proposals.
Micheál Martin told the Dáil that Ireland had "entered reservations" about the plans to increase the tax to 15% due to "the lack of certainty".
The Taoiseach said that the "key issue" for investors is that they do not want the corporate tax rate to "change every two to three years".
He was replying to the Social Democrats co-leader Catherine Murphy, who said Mr Martin's "evolving language" suggests that he believes change is coming.
She asked if that comes to pass, what will Ireland's "single most identifiable" element of industrial policy be: "What will our unique selling point be then?"
Expressing concern about Ireland's rising cost-of-living, Ms Murphy said that Ireland's housing costs at 78% above the EU average.
She argued that in the absence of Ireland's existing corporate tax rate, the high cost of living in Ireland will feature much higher in the calculations of investors considering basing themselves here.
In reply, Mr Martin said that the existing corporate tax rate is not the country's "unique selling point".
He pointed to Ireland's membership of the European Union and also the quality of the education system.
The Taoiseach said that the corporate tax rate had been important but it was not the only aspect of industrial policy.