FHA loans have a 210-day waiting period before refinancing into another FHA loan using a Streamline Refinance, or refinancing into a conventional loan to remove the monthly mortgage insurance. This waiting period is the same for VA loans, too. Whereas USDA loans have a 6-12 month waiting period, depending on the circumstances. There is no waiting period for refinancing a conventional conforming loan — unless you are tapping home equity with a cash-out refinance, which has a 6-month waiting period.