Shadow Environment Secretary Victoria Atkins said the inheritance tax raid risks farm closures and the destruction of rural communities.
The Conservatives will call on ministers to scrap planned changes to relief on the duty, saying it will damage vital family businesses. Ms Atkins said: "Today Labour MPs have a chance to do the right thing and back British farmers, rather than suck up to Keir Starmer.
"Labour have done untold damage to farming in the few short months they have been in power.
"The vindictive Family Farm Tax will affect 75,000 farms in a generation, with farmers on incomes as low as £20,000 whacked with inheritance tax bills worth hundreds of thousands of pounds on top of a national insurance hike, an acceleration in the lowering of payments and cancelled investment grants to protect the countryside."
Ms Atkins continued: "We care about high-quality food, looking after our countryside and not relying on imported food.
"Labour's Family Farm Tax will close farms down, concrete over our countryside and make us reliant on imported food. Their bad decisions will be felt long after they're removed from office."
The Daily Express crusade Save Britain's Family Farms calls on the Government to drop its tax raid.
Labour's changes to Agricultural Property Relief and Business Property Relief will see farmers pay a levy of 20% on properties and land worth more than £1million, with a higher threshold of £3million for couples who are passing on their farms.
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