The IRS began processing tax returns Monday. For filers who submit their returns electronically using direct deposit, refunds are generally issued in less than 21 days. There is a caution from the tax agency, however, that urges “taxpayers not to rely on receiving refund by a certain date, especially when making major purchases or paying bills.

If you've already filed your tax return, here's everything you need to know about your refund, including when it will arrive and how to track it.