A debate on Stamp Duty ended with a Treasury minister rejecting calls for the threshold to be raised to £500,000 and for first-time buyers to be exempt.

David Gauke, treasury exchequer secretary, said the £9.3bn Stamp Duty Land Tax raised last year was an important source of revenue.

He said: “Frankly, it’s money we need.”

Earlier, Tory MP Anne Main, who represents St Albans, had called the tax “an untouchable cash cow”.

Main led the 90-minute Parliamentary debate on the tax at Westminster Hall, where she and other Conservative MPs said the tax distorts the housing market and puts people off moving.

They also called for first-time buyers to be exempt, saying they were being prevented from getting on to the housing ladder, and argued that the tax should be linked to house price inflation.

Stamp Duty was described as a “middle class postcode tax” which forces children to squat in their parents’ homes like “overgrown cuckoos”.  Main said that scrapping Stamp Duty on homes worth less than £500,000 would fuel economic growth and increase home ownership. She said the Treasury would not notice any fall in receipts if it stopped squandering money on projects such as the Lib Dems’ free school meals.

Main, whose constituency has some of the highest house prices in the country, said: “Stamp Duty Land Tax is a strong contender for the worst designed tax, since the relevant rate applies to the full sale price.

“The Government should tackle the unfairness of paying Stamp Duty on ordinary homes below £500,000.

“Unless we tackle Stamp Duty it is going to be an ever-increasing obstacle to property ownership.”

The Conservative MP for leafy Esher and Walton-on-Thames, Dominic Raab, said the tax raises around £43m a year from his constituency alone.

He said: “If the 3% band had risen in line with inflation, it would now only be levied on homes over £1.3m.”

Tory MP for similarly affluent Richmond, Zac Goldsmith said by 2017, 96% of homes in his constituency would be in the 3% bracket.

Calling for Stamp Duty for first-time buyers to be scrapped, he said: “The current system makes no sense at all.”

Responding for the Government, Gauke said all taxes are kept under review.

* Mortgage lenders have issued an “election manifesto”, saying that whoever wins power next year should take decisive action on the housing market.

The Council of Mortgage Lenders says that measures should include increasing the supply of housing in all tenures and the reform of Stamp Duty.

Paul Smee, CML director general, said: “There are many things that the mortgage industry can and will do to promote a healthy housing market. But it is also crucial to have strategic public policy for housing that is clear, deliverable and long-term.”