Ministers' pension contributions are being pushed up by hundreds of pounds a year to share the pain of the public sector.
David Cameron, his Cabinet and Ed Miliband face paying 1.2 percentage points more of their salaries into the retirement schemes.
Ministers of state will have to pay an extra 0.8 percentage points from April, while more junior government members will see a 0.5 percentage point increase.
Cabinet Office minister Francis Maude has said: "The Ministerial Pension Scheme was not covered by Lord Hutton's recommendations, but I consider it appropriate that its members face similar changes."
The new rates do not cover Commons Speaker John Bercow, who has declined to follow the example of successive Prime Ministers and Lord Chancellors by giving up his traditional non-contributory pension - equivalent to half his salary. Mr Bercow has, however, said he will not draw the income until he is 65.
It is the third time that ministerial contribution rates have been pushed up since 2012.
Mr Maude said top-ranking ministers were now paying six percentage points more for their pensions than at the start of the parliament.
Ministers of State will be contributing 15.9%, and more junior ministers 14.4%.
The retirement provision - which can be taken at age 65 - operates alongside the gold-plated contributory pensions available to MPs.
Mr Maude added: "The amendment scheme will also make provision that members who are part of a same-sex marriage will be treated in the same way as members who are part of civil partnerships, in line with the Marriage (Same Sex Couples) Act 2013 and the arrangements for same sex marriage recognition in other public service pension schemes."