The interpellation was filed a week ago by the four non-government parties in the legislature, led by the SDP.
However the Christian Democrats split from the others after the government withdrew the plan on Wednesday. A day later, the head of their parliamentary group, Bjarne Kallis, said that the party's seven MPs would either vote with the government or abstain in the vote of confidence.
However he said the delegation was disappointed that the government refused to directly admit to MPs that it had given up on its plan to hike the minimum pension age from 63 to 65.
Loss of Credibility for PM?
As the other three opposition parties hold just 67 seats in the 200-member chamber, the government has little to fear from Friday's vote.
However many pundits say that Prime Minister Matti Vanhanen has suffered a loss of credibility during the two-and-a-half week pension-age furore.
As debate continued Thursday on the motion, MPs from the other opposition parties sought to hold Finance Minister Jyrki Katainen's feet to the fire regarding possible future cuts in entitlements.