6.3. Depreciation and Amortization
When calculating Omani taxable income, assets owned by an enterprise are separated into 2 main groups. Group 1 includes buildings, ships, aircraft, and intangible assets. Group 2 includes mainly machinery and equipment.
Group 1 assets are depreciated using the straight-line method at the following rates:
| Buildings built from selected materials (determined by the Secretary General | 4% |
| Building built from other materials | 15% |
| Quays, jetties, pipelines, roads, railways | 10% |
| Ships and aircraft | 15% |
| Hospital buildings and educational establishments | 100% |
Group 2 assets are pooled into subgroups and depreciated using the declining-balance method at the following rates:
| Drilling Equipment | 10% |
| Trucks, cranes, and other heavy equipment | 33⅓% |
| Computers, motor-vehicles, self-propelling machines | 33⅓% |
| Furniture and fixtures | 33⅓% |
| Other machinery and equipment | 15% |
Intangible assets are depreciated at rates determined by the Secretary General.