I wish I had been home to take the call. I know enough about the IRS that the call is a scam, so I would have liked to have some fun with them, I can speak with a wicked Norwegian accent. I hate that some people fall for this however.
I got a call telling me that the IRS as well, same number 425-296-1450, telling me that the IRS was filing a lawsuit against me. When I called the number I got a fast busy signal sound from the phone. So glad that I found these posts.
Got a recording about the IRS filing a lawsuit against me. They repeated the number while I was going to get a pencil (so I could look it up), but I only got the first six digits (area code + 3). Looked it up as '425296 IRS' and ended up here. Didn't buy into it for a minute once I heard the word 'lawsuit', as that requires papers to be served. The '425' just cemented it.