Corporate teaching seems to pay between 450 baht and 800 baht per hour, but this work is generally only available after 5pm when company staff finish their own work. Corporate language providers who pay their teachers less than 500 baht an hour have by and large, gone out of business. 500 baht an hour should be the absolute industry minimum (plus a travel allowance) - anything less than that and you're being royally screwed. I notice that most corporate training providers are now paying 600-800 baht an hour. And it's about time as well!