Sir Keir Starmer said "protecting" and "rebuilding" the NHS would be a "fundamental principle" of next week's Budget.
"It'll be a Labour Budget with Labour values. It'll be based on fairness," the prime minister told reporters whilst travelling to the G20 in South Africa.
"And it will have absolutely in mind protecting our public services, particularly the NHS, cutting our debt, and dealing with the cost of living, bearing down on the cost of living."
He also said the Budget would include protecting public services, cutting government debt, and dealing with the cost of living.