Is there a thread that explains how much tax we might have to pay in Thailand?

It can range anywhere from 0% to 15% depending on how legal you are.

And how much money you're earning, how much the school says you're earning, if you're married, if you have a kid etc. and as mbk says if you're legal or not (if you ain't you probably won't pay anything, although sometimes you do!).

You can pay as much as 37% tax on revenue (top-tier). However, at no time is the rate 15%

FYI rates are:

Tax rates of the Personal Income Tax

Taxable Income Tax Rate (%)

0 - 80,000 ( 2003 onwards) Exempt - -

80,001 - 100,000 5%

100,001 - 500,000 10%

500,001 - 1,000,000 20%

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

4,000,001 and over 37%

[Annual income amounts]

Keep in mind, however, that there are a number of deductibles. Best bet, read http://www.rd.go.th/publish/6000.0.html