A farmer says if she were to die, her children would have to find £500,000 in inheritance tax.
Clare Wise's family have had Manor Farm, near Darlington, County Durham, since 1875, but she fears changes introduced in last month's Budget mean she will not be able to pass it onto her daughters.
"You wouldn't ask a plumber to sell his tools and keep on working, but that's what we're being asked to do," she said.
The government says two people who own a farm jointly will be able to pass on land and property valued up to £3m tax free.
But that will not benefit Ms Wise, who is the sole owner of her mixed farm at Little Stainton.
She said there was "no money for a big inheritance bill" and "our future is being ripped out from under us".