The possibility of the option being restored was recently mentioned by Helir-Valdor Seeder, the recently-elected chairman of junior coalition partner Pro Patria and Res Publica Union (IRL).

"I think that if the chairman of one coalition partner changes, we cannot object to the new chairman of the coalition partner wanting to review [the coalition's] activity," Ratas said at a government press conference on Thursday.

He said that the ruling coalition is definitely "ready to look over and listen to" Seeder's thoughts on amendments to the tax package.

"I think that it is natural for the chairman to want to have another look at the principles and the Center Party will definitely not impede that," Ratas said.

"There was nothing surprising in this; it could be anticipated based on Seeder's remarks when IRL was discussing their candidates for chairman," said SDE deputy chairman Indrek Saar. "It would be peculiar for SDE to say that Seeder's wish seems strange to us as we were the ones to introduce that tradition two years ago."

Asked if restoring the opportunity for spouses to declare their income in a joint return could come under consideration by the ruling coalition, Ratas answered affirmatively. "Yes, it could come under consideration," said the prime minister, adding that restoring this opportunity would bring with it additional costs and the government would need to either find additional resources or make spending cuts to finance these costs.

"Of course, we would not mind it if we found these resources," Saar added.