Is a Thai marriage visa eligible for a yearly tax return if I work in Thailand?

You are still required to pay taxes in Thailand if you work for a Thai company. They will with-hold your taxes on each pay check. Sometime in late January or early February they will give you a tax form for the year. You will take this to any revenue department and they will figure your actual tax amount. You may get a small refund, or you may owe money. There is no way of knowing this till you go. Amd taxes have to be filled every year to renew your work permit.