I am being billed 18000baht for year end audit on about 2mil in turnover. Is this high?

yes 12 is the standard

I don't believe that you can apply a standard or a norm for audit fees. It very much depends on the nature of the company setup (and turnover, profit and loss etc. et al). The auditors fee is not dependant on these factors, his fees are based on the size of his own company i.e. the higher number of people employed by him (his overheads) will determine the level of fees.

I am currently paying 15K and am satisfied with this level.

ok thank you for the replies, currently employ 5 people. it is co. ltd. I will pay, just dont appreciate emails on the 5th demanding payment on the 6th but <deleted>? haha