The IRS offers this resource for overall information on Identity Theft:
Taxpayer Guide to Identity Theft
Tips to Identify Tax Scams
Scammers will threaten you over the phone. A caller – posing as an IRS or stateTax Department employee – will demand that you immediately make payment for a tax debt. He or she also may threaten you with police action or deportation.
The IRS and any state tax department will always notify you of a tax debt first by mail before contacting you by telephone. And the Tax Department will never demand that you pay taxes without providing you with the opportunity to question or review the amount that you owe.
Scammers will demand that you pay in a specific way. For instance, con artists often demand that payments can only be made through wire transfers, prepaid debit cards or even in-person. All tax departments will always provide you with multiple options for payment.
Scammers will try to trick you through phishing emails. Con artists, sometimes using what appears to be the official logo of a federal or state agency, will use email to ask you to provide personal information or access to bank accounts.