I recently had my first 12 month fixed term deposit mature, and was somewhat surprised to see that tax was deducted from the interest. As the interest is the only income I earn inside Thailand, is anybody able to advise me how I can recover the tax, as the total interest paid was only 14k baht and the tax deducted was 2k baht, approx. 14%. I assume that I will have to lodge an income tax return, but have no idea of how to go about this. Any help will be greatly appreciated.

Try this link http://www.thaivisa.com/forum/topic/610294-obtaining-refund-of-tax-withheld-on-thai-bank-fixed-savings-account/

there is many many many posts on this SEE BANK INTEREST RATES.