According to the article linked below, those that have been scamming people with fraudulent phone calls from the IRS have made tweaks to their methods. For the past few years, scammers have been making threatening phone calls posing as an IRS agent in an attempt to scam money out of individuals. These were pretty simple to reject because the IRS does not make phone calls for initial contact, and instead, prefer the letter approach. Now, it seems, scammers have caught on to this fact and are creating fake letters from the IRS with requests for money or personal information.
Link is here.
Link is here.