| Abbreviation | Definition |
|---|---|
| ODT | Ohio Department of Taxation |
| ODTA | Ontario Disability Tax Agency |
| ODTC | Orphan Drug Tax Credit |
| OFT | Office of Fuel Tax |
| OITE | Office of Industrial Tax Exemption |
| OLT | On Line Taxes |
| OPBDIT | Operating Profit Before Depreciation Interest and Tax |
| OPTC | Ontario Property Tax Credit |
| OSHPTG | Ontario Senior Homeowners Property Tax Grant |
| OSHPTG | Ontario Senior Homeowners' Property Tax Grant |
| OSHPTG | Ontario Seniors Homeowners Property Tax Grant |
| OSTC | Opportunity Scholarship Tax Credit |
| OSTC | Oregon Society of Tax Consultants |
| OTA | Office of Tax Appeals |
| OTB | Ontario Trillium Benefit |
| OTR | Office of Tax and Revenue |
| OUTA | Organisation Undoing Tax Abuse |
| OZT | Octroi Zila Tax |
| PATANCI | Profit After Tax And Non Controlling Interest |
| PATI | Public Access Tax Information |