How many previous years can you file a injured spouse form 8379 for?

Usually you need to file form 8379 as soon as you learn about any problems with your refund, for most people is the year the file for the first time jointly. If you are trying to recover from a few years back because you didn't know about the injure spouse form, it is a gamble. You can just file it a wait to see what the IRS will respond, in the worst case scenario they will denied it.