Opportunity Zones Opportunity Zones are an economic development tool that supports investment and growth in distressed areas of the United States. Invest in Opportunity Zones and defer tax on eligible gains. Plug-In Electric Drive Vehicle Credit (IRC 30D) Plug-In Electric Drive Vehicle Credit (IRC 30D) - Internal Revenue Code Section 30D provides a credit for Qualified Plug-in Electric Drive Motor Vehicles including passenger vehicles and light trucks. Research Credit Guidelines and audit technique guide are provided for field examiners on the examination of Research Credit cases. Deducting Business Expenses Understand the different types of business expenses, what is deductible and the general rules for deducting expenses. Abusive Tax Shelters and Transactions The Internal Revenue Service has a comprehensive strategy in place to combat abusive tax shelters and transactions. This strategy includes guidance on abusive transactions, regulations governing tax shelters, a hotline for taxpayers to use to report abusive technical transactions, and enforcement activity against abusive tax shelter promoters and investors.