The IRS (Internal Revenue Service) is a federal agency responsible for collecting taxes and enforcing TAX laws. The term 'IRS Concern' refers to the various aspects of the IRS's work, including INCOME, taxes, and TAX law. The crossword solutions for this term are INCOME (6 letters), TAX (3 letters), INC (3 letters), and TAXLAW (6 letters). INCOME refers to the money earned by individuals or businesses, which is subject to taxation. TAX is the money paid to the government by individuals or businesses. INC stands for Incorporated, which is a type of business structure that is subject to taxation. Finally, TAXLAW is the body of laws that govern taxation.