| Abbreviation | Definition |
|---|---|
| AT | Abolition of Tax |
| ATAD | Anti Tax Avoidance Directive |
| ATAF | African Tax Administration Forum |
| ATAO | Application for Taxpayer Assistance Order |
| ATB | Appellate Tax Board |
| ATCF | After Tax Cash Flows |
| ATDR | Alternative Tax Dispute Resolution |
| ATED | Annual Tax in Enveloped Dwellings |
| ATED | Annual Tax on Empty Dwellings |
| ATED | Annual Tax on Enveloped Dwellings |
| ATEP | Amazon Tax Exemption Program |
| ATFS | American Tax Funding Services |
| ATFS | American Tax Funding Servicing |
| ATI | All Taxes Included |
| ATL | After-Tax Loss |
| ATO | Australian Taxation Office |
| ATP | Accredited Tax Preparer |
| ATP | After Tax Profit |
| ATPI | American Tax Policy Institute |
| ATPRA | American Tax Payer Relief Act |