Taxpayer Identity Theft Prevention and Enforcement Act of 2014 - Amends the federal criminal code to include certain felony violations under the Internal Revenue Code as aggravated identity theft, including the following offenses when committed in connection with the filing of a tax return: (1) conspiracy to defraud the government with respect to claims; (2) false, fictitious or fraudulent claims; and (3) conspiracy to commit any offense against, or to defraud, the United States.