Economists are warning the 2032 Brisbane Olympics could badly affect the economy as the financial windfall from the event is over-blown while dragging money away from necessary community investments.

The Federal and Queensland governments have both cited research by accounting firm KPMG, commissioned by the state tourism department, which found the 2032 Games would deliver up to more than $17 billion in benefits to the nation.

However leading economists like Saul Eslake believe there may be a short term benefit but there was no evidence that such large events delivered a lasting economic boost.