Defined benefit payouts will peak this year before tailing off as the impact of scheme closures is felt, the Department for Work and Pensions says.
Analysis from the department suggests average annual payouts will hit £7,100 this year, before dropping below £4,000 in 2034 and will be down to £2,400 by 2060.
Pensions minister Steve Webb said the figures marked a significant shift in pensions saving and demonstrated the importance of making auto-enrolment work.
"With payouts peaking this year, final salary schemes closing and figures that show that only 38% of working-age people are saving into a private pension, it is clear that we are facing a different world in pensions," he said.
"That is why our workplace pension reforms are so critical, bringing millions of people into pension saving for the first time."
The DWP said approximately six million savers benefit from some form of DB scheme but only 10% of firms have final salary schemes that are still open.
It predicted that auto-enrolment, due to begin in October for the largest firms, will bring up to 10 million more people into pensions saving.
The analysis on DB payouts was carried out with a "dynamic microsimulation" modelling tool and a sample of synthetic individuals, designed to be representative of the UK population.
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