"Changes to pensions are likely to be bad news for long-term retirement savings. People need stability when it comes to their pensions and moving the goalposts - even just a little bit - could further erode people's faith in the system," said Sean McCann, personal finance specialist at NFU Mutual.
"Many predictions point to a possible introduction of National Insurance on employer pension contributions which could have a significant impact on salary exchange arrangements.
"At a time when millions of workers are being automatically enrolled onto workplace pension schemes, removing or diluting this generous incentive for employers to make contributions would be counter-productive."
Research conducted last year on behalf of NFU Mutual indicated more than a third of people working past retirement age don't believe they'll ever give up work, more than half claiming it's because of a lack of savings.
These Retirement Rejecters could also be in for a further blow to their finances if the Chancellor backtracks on promises not to levy National Insurance on people working past State Pension Age, as part of his plans to merge income tax and National Insurance.
"If it does come into force, it could have a damaging effect to the older workforce and would raise a huge question mark over the purpose of National Insurance," Sean added.
"Simplification of a very complex tax system would be a welcome move but we would like to see the Chancellor either introduce more measures to encourage people and their employers to save for retirement or leave pensions alone."
