You may just visit the official Revenue Department's website (www.rd.go.th). It is in English too.
For personal income tax, the link is http://www.rd.go.th/...ish/6045.0.html
For corporate income tax, the link is http://www.rd.go.th/...ish/6044.0.html
cmbe made a small error. For life insurance premium, the maximum deduction is 100,000 bahts not 10,000.
As you will see in the revenue department's website, there are several other possible allowances and deductions.
Thank you Stef, you wake me up to read more carefully, it is old info. about 10,000 baht deduct tax for insurance premium, it has been changed to 50,000 baht (deduct 10,000+exemption 40,000), then changed again to 100,000 baht (deduct 10,000 baht +exemption 90,000 baht).
I would like to explain a little bit about deduct tax for insurance premium 10,000 baht and 100,000 baht.
Taxpayer can deduct tax for insurance premium as real paid but not exceeding 10,000 baht(for the first step), then amount of insurance premium that higher than 10,000 baht and not exceeding 90,000 baht (only life insurance from 10 years up and with company insurance in Thailand) will be exempted for calculation of personal income tax.
Example: you paid for insurance premuim 15,000 per year (for life insurance 10 years) and you paid also for your wife(no have income) life insurance premium 11,000 baht per year, no have children;
you have net income = 120,000 baht
deduct for yourselve - 30,000
deduct for yourwife (no income) - 30,000
deduct for your life insurance (1st step) - 10,000
deduct for your wife insurance
(only when she has no income) -
10,000 total deduct
-80,000 baht
income after deduct = 40,000 baht
deduct donate cash (donated 10,000 deduct 10% 1,000 baht
income for calculation personal income tax = 39,000 baht
2nd step deduct life insurance premium (15,000- 10,000 1st step)
- 5,000 baht
amount of income for calculation PIT is = 34,000 baht
P.S. if you have income for calculation of PIT = 70,000 baht (other amount and example) and you paid for life insurance premium 90,000 baht, you can deduct 1st step 10,000 baht and 2nd step only 70,000 baht (= amount of income for calculatePIT).