Labour peer Tony Berkeley wants Prince Charles to pay more tax.
Berkeley has tabled a Private Member's Bill designed to bring the Duchy into line with other companies by forcing it to pay corporation tax.
Under the current set up, the Duchy provides an annual income to Prince Charles through different areas of land and property, which is valued at more than £1 billion.
Prince Charles voluntarily pays income tax on what he earns from the Duchy. But he does not pay corporation tax at the moment - which is currently set at 19 percent.
And Lord Berkeley, 78, is determined to see the current situation overhauled.
He recently said, according to the Daily Mail newspaper: "There are too many royals on the public purse. There should be no more than two or three.
"My Bill would bring the Duchy into line with other successful commercial ventures. Charles should pay the same taxes as everyone else."
Meanwhile, Prince Charles's Highgrove estate has started selling Christmas goods - including £15 corgi socks.
The estate, which is based in Gloucestershire, south west England, opened its festive online shop on Monday (23.10.17) with customers able to splurge their money on a number of Christmas-themed items, including a teddy bear, a Christmas pudding and a luxury hamper.
But mother-of-three Jenny Sellick was left unimpressed by the cost of the gifts.
She said: "How does Prince Charles think the ordinary family can afford these prices?
"You can get a really good Christmas pudding at Aldi for about £8 and a box of charity Christmas cards costs about a pound. No way could we afford these Highgrove prices."
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