John Lamont MP has called Labour's Family Farm Tax a "shameful betrayal" of farmers which will "rip apart rural businesses" in a speech to the House of Commons on Monday.
It comes as the Scottish Conservatives announced plans to hold a vote opposing Labour's Family Farm Tax in the Scottish Parliament on Wednesday.
In his speech at Westminster, John Lamont MP also cited comments from local farmers, Colin and Jill McGregor of McGregor Farms, who said "The Government seems to have no idea of the costs involved in agriculture."
They added that "The Autumn budget that Labour broadcasted last week will affect every family farming business across the country. We have been digesting the details over the last couple of days and can see a substantial financial impact on our farming business.
Colin and Jill of McGregor Farms continued: "The tax that would have to be paid on death will cripple many family farms, with a huge proportion having to sell land to pay the tax and breaking up family businesses that have been working the land for many generations."
Scottish Borders MP, John Lamont, said: "Labour's Family Farm Tax will rip apart rural businesses and prevent farmers from passing on the family farm to the next generation.
"It's cruel, it's bitter and it's divisive.
"And it's the opposite of what Labour said they would do. It's another broken promise from Labour.
"I've got news for Labour - farmers are working people.
"In fact, they are some of the hardest working people in any industry. They get up before dawn and they put in a hard shift every day.
"Labour should be ashamed of raising tax on farmers and preventing them from passing on the family farm.
"This shameful betrayal won't be forgotten by rural areas or by my Borders constituents."