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NEW YORK (CNNMoney)
If someone calls saying he's an IRS agent and demands that you send money immediately, hang up.

It's a phone scam.

In fact, it tops the IRS "Dirty Dozen" list of tax scams this year, and it's been surging in recent months, the agency said Thursday.

The Treasury Inspector General for Tax Administration (TIGTA), which oversees the IRS, has received reports of 290,000 scam calls since October 2013 and said nearly 3,000 victims have been swindled out of $14 million so far.

By altering their caller ID number to make it look like they're calling from an IRS office, these scammers often threaten vulnerable people like the elderly and new immigrants with things like arrest, deportation or the loss of their driver's license if they don't pay immediately for money purportedly owed.