Not just the US, IIRC financial institutions around the world are required to do decimal rounding. OTOH I don't see why you would even use floating point for mo

Not just the US, IIRC financial institutions around the world are required to do decimal rounding. OTOH I don't see why you would even use floating point for money. Just scale your integers to the required precision (and make sure you've got enough bits for the kind of amounts you need to be able to handle) and you're good.