There is a fairly common IRS or "tax scam" being practiced by scammers on both Canadian and USA residents.
USA tax payers should read this:
http://www.irs.gov/uac/Newsroom/IRS-Reiterate ... -Telephone-Scam
Short answer:
The IRS never initiates a contact via phone.
They always send a snailmail first.
Educational post:
This scam is also described as scam #11, here:
http://phonehelp.2truth.com/facts_rev.html
Remember to return here, to 800notes.com, after you look at any of the information at that site, either to post more information, or to let us know you avoided the scam, or to read any further information about that number that others may post.
Got a call from this number today...voicemail says this is the final notice from the IRS before them filing a lawsuit against me, and that I should call this number back asap. Ha!! I hope people don't fall for it. BEWARE!! I'm thankful to have this site as a reference when I want to check the legitimacy of toll-free callers.