| AAATP | American Academy of Accounting Tax Professionals | |
| AATP | American Academy Of Tax Practice | |
| ABST | Antigua and Barbuda Sales Tax | |
| ABST | Antigua Barbuda Sales Tax | |
| ACAUT | Against Corruption And Unabated Taxation | |
| ACAUT | Action Committee Against Unabated Taxation | |
| ACIT | Assistant Commissioner of Income Tax | |
| ACIT | Additional Commissioner of Income Tax | |
| ACTC | American College of Tax Counsel | |
| ACTF | American – China Trade Friction | |
| ACTL | Amsterdam Centre for Tax Law | |
| ADIT | Advanced Diploma in International Taxation | |
| ADIT | Advanced Diploma in International Tax | |
| ADIT | Accumulated Deferred Income Taxes | |
| AET | Accumulated Earnings Tax | |
| AFFT | Americans For Fair Taxation | |
| AFTC | Alternative Fuel Tax Credit | |
| AFTR | Annual Federal Tax Refresher | |
| AFTR | Annual Filing Tax Refresher | |
| AFTR | Automated Fuel Tax Reporting | |
| AHTC | Affordable Housing Tax Credits | |
| AIT | All Included Taxes | |
| AIT | Application of Internal Taxes | |
| AITA | Absolute Integration of Tax Accounting | |
| AITD | Angel Investors Tax Deduction | |
