Confused about a specific term or acronym? Solve the mysteries of terminology with this informative resource. Updated regularly with industry-specific vocabulary and concepts, the Glossary provides easy-to-understand definitions of tax-related terms.


401(k), 403-B, 408(k), 501-C A cash or deferred arrangement that allows employees to authorize their employer to place pretax dollars in a retirement plan that invests the money. The contributions (including those matched by the employer) and any earnings on them are not subject to federal income tax (and most state income taxes) until they are withdrawn.

403(b) Annuity An annuity or mutual fund that provides retirement income for employees of public schools and certain tax exempt organizations.