One in four (26 per cent) of over 55s in employment said they were planning to work beyond their retirement date after using pension freedoms to release cash from their savings.
More than 200,000 Britons opted to access cash following the change to rules in April, it was revealed earlier this month.
Regulators and the government are overhauling financial advice pensioners are given as a result of the changes.
Over a third (35 per cent) of those who said they would put their retirement on hold claimed they would be likely to work for a further five or more years, while a quarter (23 per cent) would prolong their careers by two years.
Rod McKie of Zurich said: “The pension freedoms could have a far-reaching effect on retirement trends. As many as a quarter of over-55s could delay retirement – some by more than five years – after unlocking cash from their pension.”
Zurich warned companies will have a bigger role in supporting employees nearing retirement.