| Abbreviation | Definition |
|---|---|
| HIT | health insurance tax |
| HPTC | Healthcare Provider Taxonomy Codes |
| HPTC | Historic Preservation Tax Credit |
| HROT | Hotel Room Occupancy Tax |
| HST | Harmonised Sales Tax |
| HST | Hidden Sales Taxes |
| HSTE | Historic Site Tax Exemption |
| HT | Haut Taxes |
| HT | Hors Taxes |
| HTC | Historic Tax Credit |
| HTC | Housing Tax Credits |
| HTCC | Housing Tax Credit Contribution |
| IBDIT | income before depreciation interest and tax |
| IBDIT | Interest before Depreciation Interest and Taxes |
| IBT | Illinois Business Tax |
| ICTA | Institute of Certified Tax Administrators |
| ICTD | International Centre for Tax and Development |
| IDT | Indirect taxation |
| IET | Interest Equalization Tax |
| IETC | Independent earner tax credit |