GP practices could be pushed "over the edge" by a planned rise in the National Insurance (NI) rate for employers, a doctor has said.
The government has said the NHS and the rest of the public sector would be shielded from the rise but that does not cover GP practices, many of which are run as small businesses.
Dr Andrew Purbrick, who represents 300 GP practices across the south of England, said many would be forced to cut back on staffing or close.
"We would describe general practice as being on the precipice and, for a significant number of practices, this could push them over the edge," he said.