We fact checked Jim Chalmers on saving budget revenue windfalls. Here's what we found

Jim Chalmers says Labor has returned 88 per cent of revenue upgrades to the budget, compared to 40 per cent under the Coalition. Is that correct?

Treasurer Jim Chalmers says that over two budgets and a MYEFO the government has banked 88 per cent of revenue upgrades, compared to the Coalition's 40 per cent. RMIT ABC Fact Check runs the numbers.