A thinktank has proposed scrapping Stamp Duty on a main residence and replacing it with a tax on sellers based on the growth in their property price.

The report by the Social Market Foundation claims this would help pay for the costs of the coronavirus financial support and reduce the UK’s debt burden.

Report author Michael Johnson, a former banker and actuary, suggested the tax could be set at 10% of the increase in the value of the property since the last time it was sold and would replace Stamp Duty on purchases of a main residence, therefore removing the charge from buyers.

He suggested this property gains tax could raise £421bn over the next 25 years.

The new tax would fall largely on older people – who own most of Britain’s property – and those who inherit property and then sell it, the report said.

Johnson said: “The alternative is that the young will have to pay for a debt-laden future. They are already hugely disadvantaged, financially, relative to older generations. Asking them to bear the burden of this crisis in the decades ahead would be unfair and unreasonable.”

James Kirkup, director of the Social Market Foundation, added: “These reforms are bold, far-reaching and could be politically controversial.

“The older voters who own most British property are a powerful group.

“But the scale of the coronavirus crisis and the unprecedented outlook for the public finances mean that responsible politicians of all parties must be prepared to embrace new ideas and take bold action.

“Failure to act risks severe economic and social harm. A post-crisis era where the costs of the crisis fall more heavily on the young than the old could strain the social contract between the generations to breaking point.”