Every subject has acronyms associated with it. Tax law is not different in this regard. Popular acronyms and associated meanings are reproduced below from the Internal Revenue Manual (IRM). I.R.M. 4.10.7.1.5 (2022).
| Acronym | Meaning |
| A-CIS | AIMS - Centralized Information System |
| ACM | Appeals Case Memorandum |
| AM | Advisory Memorandum |
| AOD | Action on Decision |
| ARC | Aging Reason Code |
| ATG | Audit Technique Guide |
| BBA | Bipartisan Budget Act |
| BLS | Bureau of Labor Statistics |
| BTA | US Board of Tax Appeals |
| CB | Cumulative Bulletin |
| CCDM | Chief Counsel Directives Manual |
| CFR | Code of Federal Regulations |
| CPI | Consumer Price Index |
| CUR | Confidential Unpublished Ruling |
| DCS | Data Collection Sheet |
| DDC | Decision of District Court |
| ECF | Electronic Case File |
| ELP | Electing Large Partnership |
| EQMS | Examination Quality Measurement System |
| EQTS | Exam Quality and Technical Support |
| FAQs | Frequently Asked Questions |
| FR | Federal Register |
| FTS | Fast Track Settlement |
| GCM | General Counsel Memorandum |
| IDR | Information Document Request |
| IRB | Internal Revenue Bulletin |
| IRC | Internal Revenue Code |
| LB&I | Large Business and International |
| NPRM | Notice of Proposed Rulemaking |
| PLR | Private Letter Ruling |
| POD | Post of Duty |
| SB/SE | Small Business/Self-Employed |
| SFR | Substitute for Return |
| SME | Subject Matter Expert |
| SPDER | Office of Service-wide Policy, Directives, and Electronic Research |
| TAM | Technical Advice Memorandum |
| TC | Tax Court |
| TD | Treasury Decision |
| TEFRA | Tax Equity and Fiscal Responsibility Act |
| TIN | Taxpayer Identification Number |
| TM | Technical Memorandum |
| USC | United States Code |
| USTC | United States Tax Court |