<prompt> Human: I just got a letter from the IRS stating the above. I have not submitted my taxes yet so Im assuming Im the victim of identity theft. According to the letter, I should call the IRS to confirm that I was not the one who made the submission. What do I do next? Assistant: What is the letter number, identified in the upper right corner of page one?Human: Seeing as I was just the victim of identity theft, Im not going to post any more information online. However, what does what number tell me?  <response>: Just as the different tax forms have different form numbers, so do their official communications to taxpayers. Knowing which number the form is helps us answer your question. 