Here below are Accounting Tips and extracts from Khun Sirirat of Thai Accounting  www.thaiaccounting.com which for anyone running a business in Thailand will find invaluable.
I have to say that in real life accounting can be either an angel or a ghost, depending on how well it is managed. Accounting is hardly a favourite [...]

Transfer Tax and fees when transferring real estate in Thailand from 1st June 2010
For the sale of: 1) a house; 2) land up to one rai (1,600m2) including a house; 3) raw land subdivided under a land allocation license (the license a developer gets to subdivide a larger tract); 4) land including [...]

TAX RATES
CORPORATE TAX
A Thai Company generally pays tax at 30% of Net profit. However, some types of company are entitled to a rate reduction.
•  Small business with paid up capital less than 5 million baht
20% of Net profit < 1 million baht
25% of Net profit 1-3 million baht
•  Company registered in the [...]

PERSONAL INCOME TAX is applied on a graduated scale as follows;

Net Annual Income (Baht)
Tax Rate

0
150,000
0%

150,001
500,000
10%

500,001
1,000,000
20%

1,000,001
4,000,000
30%

4,000,001
over
37%

Other types of taxable income and the rate of standard deduction include:
. Interest, dividends, capital gains on the sale of securities: Forty percent but not exceeding 60,000 baht.
. Rental income: Ten percent to 30 [...]

PROPERTY PURCHASE Tax Summary: (From 1st June 2010)

Tax Type
Tax Rate

Transfer fee
2.0%

Stamp Duty
3.3%

Specific Business Tax
0.1%

Withholding Tax
1.0%