Wall Street Journal article- "No, That isn't the IRS Calling. Just Hang Up.

Phone calls by fraud artists posing as Internal Revenue Service employees and demanding money have surged in recent months.
The smart response if you get such a call: Just Hang Up. And if the scammer calls back, hang up again, say Eric Smith, a spokesman for the IRS, and Timothy Camus, an official with the Treasury Inspector General for Tax Administration, a government watch dog known as Tigta. "Often the scammer will move on," Mr. Camus says.
Next step: Report the incident to Tigta at 800-366-4484 or tigta.gov. Also contact the Federal Trade Commission through the FTC Complaint Assistant at FTC.gov, and add "IRS Telephone Scam" to the complaint comments.
The impostors often threaten to arrest the victim if he or she doesn't pay immediately using a prepaid debit card, Mr. Camus said in congressional testimony earlier this month. Other threats involve loss of a driver's license or business license.
The IRS never initiates contact with a taxpayer by phone, email or text message, messrs. Camus and Smith say. The IRS will never call about taxes owed without having first mailed a bill.  Nor will the agency require a taxpayer to use a specific payment method or ask for credit or debit card numbers over the phone. And unpaid taxes won't cause a driver's license to be revoked.
Between 9,000 and 12,000 complaints about such phone scams are filed each week with Tigta.  Since late 2013, some 3,000 victims have lost an average of $5,000, Mr. Camus said. -Laura Saunders