Fine Gael and Fianna Fáil have seen their support rise, as the two parties argue over tax policy.
While Sinn Féin continues to struggle in the wake of a poor presidential election campaign, according to the latest opinion poll.
The Red C poll for the Sunday Business Post shows Fine Gael are the most popular party in the country on 34% - up one in a month of tax cut promises from Leo Varadkar.
Fianna Fáil trail on 27%, up two compared with last months figures.
But it is thought the numbers will have little new bearing on the ongoing Confidence and Supply talks.
Sinn Féin are down 2% to 13 points, while Labour are up one to 6%.
The Independent Alliance are also up one to 5%.
Independents overall though have seen their support drop by two to 10%.
The Green Party are down one to 3%, with the Social Democrats unchanged on 2%.
Solidarity-People Before Profit retain a mark of 0% support for the second month in a row, with Renua also on 0%.