Depreciation: Provided that in no case shall the deduction exceed the following percentage of cost as shown below. The straight-line basis is themethod most commonly used by companies, but any generally accepted basis, such as sum-of-the-years-digits or double-declining method, is permitted.
However, if a company adopts an accounting method, which the depreciation rates vary from year to year, the company is allowed to do so provided that the number of years over which an asset depreciated shall not be less than 100 divided by the percentage prescribed below ;
| Types of Assets | Depreciation Rates |
1. Building |
|
| 1.1 Durable building | 5 % |
| 1.2 Temporary building | 100 % |
2. Cost of acquisition of depleted natural resources | 5 % |
3. Cost of acquisition of lease rights |
|
| 3.1 no written lease agreement | 10 % |
| 3.2 written lease agreement containing no renewal clause or containing renewal clause but with a definite duration of renewal periods | 100% divided by the original and renewable lease periods |
| 4. Cost of acquisition of the right in a process, formula, goodwill, trademark, business license, patent, copyright or any other rights: |
|
| 4.1 unlimited period of use | 10 % |
| 4.2 limited period of use | 100% divided by number of years used |
| 5. Other depreciation except land and goods | 20 % |
| 5.1 machinery used in R&D | initial allowance of 40% on the date of acquisition and the residual can be depreciated at the rate in 5 |
| 5.2 cash registering machine | initial allowance of 40% on the date of acquisition and the residual can be depreciated at the rate in 5 |
| 5.3 passenger car or bus with no more than 10 passengers capacity | depreciated at the rate in 5 but the depreciable valve is limited to one million baht |
6. Computer and accessories |
|
| 6.1 SMEs* | initial allowance of 40% on the date of acquisition and the residual can be depreciated over 3 years |
| 6.2 other business | depreciated over 3 years |
7. Computer programs |
|
| 7.1 SMEs* | initial allowance of 40% on the date of acquisition and the residual can be depreciated over 3 years |
| 7.2 other business | depreciated over 3 years |
* SMEs refer to any Thai companies with fixed assets less than 200 million baht and number of employee not exceeding 200 people
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