You have a lot more to consider, given what you want to do, than simply the visa. First get a type O visa based on Thai wife. This has two advantages, first being you can work with this visa, and get a work permit, but that is not the main reason in your case. The main reason to get that visa is going to be the actual cost of you doing business, and the requirements to get your work permit, that you can not do any work without, not even volunteering. For a regular business you can only own 49% of it. The rest must be owned by Thais. The next things, and this is where being on a marriage visa comes into play, you must have bt2million in registered capital in the business, and hire at least 4 Thai employees you pay wages and social security on in order to get your work permit. If you set the business up with your Thai wife those amounts are cut in half, bt1million in registered capital, and only hiring two Thai employees to get your work permit. There are other business structures you can set up under, but any other business structure with require the bt2million in registered capital for your work permit. I might add that one of the Thai workers can be your accountant, as accounting is a restricted occupation for Thais only, and you must have a licensed Thai accountant. If you are working purely remotely, with no business of any kind done in Thailand then you have another option, but that doesn't sound like your intention. For the visa itself you will need bt400,000+ in your bank account, together with your marriage license, a copy of your wife's ID card, and a copy of the house book she is listed in, she will know all about this part. Also copies of your passport. These will get you your 90 day marriage visa before you enter Thailand from the Thai embassy/consulate you apply through. Once you get to Thailand you get a Thai bank account in your name only, and transfer the bt400,000 into that account. You go to immigration, with your wife, and get the list of documents needed for your one year visa extension. When you have all these documents, and it is nothing difficult to get, it just takes time. When your bt400,000+ has been in your Thai bank account for two months then, together with all the documents, you can apply for your one year extension. Remember though, when ever you are dealing with immigration concerning this visa, and extension always take your wife with you. Keep copies of all the documents, as the following years all you need is updated bank letters, and new pictures. Everything else is the same, unless you moved.