72000 euros are around 2.88 millions bahts taking 40 bahts per euro.
That, with the new proposed income tax would qualify for a 25% rate (currently 30%). Next upper would be more than 3 million (30% proposed and 30% current), next lower would be between 1.5 and 2 million (proposed 20%, currently 30%).
I believe the new proposed rate would be implemented on 2015. This said, in Thailand company benefits and variable payments that are not taxable are very common to avoid being charged, so presuming that your salary is not flat rated I would try to bargain with your employer to diversify your salary to reduce your exposure.
Also, if you are payed through a broker (787 Norwegian, wild guess
) you wouldn't be liable, me thinks.