| Abbreviation | Definition |
|---|---|
| ATP | Authorised Training Principal |
| ATR | Accounting to Reporting |
| ATRA | American Tort Reform Association |
| ATRRS | Accounting Transaction Recording and Reporting System |
| ATSA | Accountants Technology Showcase Australia |
| ATSO | Accounting and Tax Student Organization |
| ATSO | Accounting and Taxation Student Organization |
| ATT | Association of Taxation Technicians |
| ATTC | Accounting Training and Testing Center |
| ATTITUDE | Active Teens Taking Initiative To Understand Driving Experiences |
| ATU | Annual Tax Unit |
| ATV | Average Ticket Value |
| ATV | Average Transaction Volume |
| AUC | Actual Unit Cost |
| AUC | Average Unit Cost |
| AUDSEC | Auditing Standards Executive Committee |
| AUD-SOP | Auditing Standards Division Statements of Position |
| audt | audit |
| AUG | Industry Audit Guides |
| AUI | Auditing Interpretations |