UK chancellor Jeremy Hunt is understood to be looking at increasing the lifetime pension allowance in a bid to reverse the trend of early retirements.
The PA news agency understands Hunt is considering allowing workers to put more money into their pension pot before being taxed as part of his budget package.
The lifetime allowance (LTA) currently stands at £1.07 million, with savers incurring tax after that personal pension pot threshold has been exceeded.
Reports differ about how much Hunt could put the LTA up by in his fiscal statement on Wednesday.
The Times said the chancellor would hike it to GBP1.8 million, while The Daily Telegraph said it could be set to more than £1.5 million.
It is also understood that the budget could increase the annual allowance pensions. Hunt has tasked his advisers with calculating how much a change would cost the exchequer.
The Telegraph and The Times said the amount each person can save each year before incurring tax was likely to rise from £40,000 to £60,000.
In his Bloomberg speech earlier this year, Hunt vowed to consider fiscal measures that would help the over-50s who had taken early retirement during or after Covid-19 to return.
Speaking in January, he said employment levels were lower than they were before the coronavirus pandemic by around 300,000 people.
"So, to those who retired early after the pandemic, or haven't found the right role after furlough, I say: Britain needs you," he said.
"And we will look at the conditions necessary to make work worth your while."
The pension lifetime allowance was first applied in 2006, when it was set at £1.5 million.
It rose to a peak of £1.8 million by 2012 before gradually being cut. It was due to stay at £1.07 million until 2026 but Hunt could choose to bring a change forward.
The British Medical Association has called the current LTA rate "punitive" and argued it has encouraged doctors to leave the profession.
On its website, the BMA says: "high contribution rates, significant pay erosion, and a punitive pension taxation system have resulted not only in an exceedingly high cost of scheme membership for senior doctors, but also in them receiving reduced pension benefits.
"This has resulted in large numbers of doctors retiring early or reducing their hours."
In January, former pensions minister Ros Altmann lobbied ministers to change "illogical" pension rules to help ease a workforce crisis in the NHS.
During a House of Lords debate, the Conservative peer said "even middle earners" were finding that their "supposedly tax-free pension contributions" were "causing them to receive huge tax demands that can even exceed the extra earnings".
She said it meant that some doctors were "effectively paying to work for the NHS" and that the current system was "incentivising people not to work".
The Treasury said it does not comment on budget speculation.
Meanwhile, the chancellor has confirmed that £63 million will be made available in his budget to help public swimming pools stay open in the face of high energy bills.
More than £20 million of the one-year fund will be made available in grants to leisure centres with pools that are dealing with immediate cost pressures, while £40 million is earmarked for investment in decarbonisation and long-term energy efficiency measures.
The Treasury said leisure centres with swimming pools are responsible for up to 40% of local authority carbon footprints due to the need for bathing waters to be heated to safe temperatures.
"Soaring bills are hitting us all hard, and community pools have been thrown in the deep end," Hunt said.
"I know they are loved by millions of people. This vital lifeline will keep them afloat."
By Patrick Daly, PA Political Correspondent