What are the requirements to renew a marriage visa in Thailand if I have a work permit and a salary of 35,000 THB?

@Nicolas *******

there is no reason to involve your WP / Salary in case they are not over 40k, which is minimum for marriage extension. So far, you need to deposit 400k THB in lump sum ( EUR), or get 12x monthly transfers to local bank from abroad in amount 40k+, or get WP/ Salary above 40k. The MOE issues WP w/o minimum wage by nationality requirement, but this will be not enough for extension and you can't use any "combination" like wage + extra money in bank. Each extension option require it's own set of documents.

In some case you can use "swear letter" or as we call it "affidavit" from your consulate, which is "swear" you have some income by month. The problem is, if you do this first time, then possible question can be asked by imm and additional supplemental documents may be asked, like transfer proofs, and you simply don't have enough time to build 12x transfers history.

So, for very first extension the easiest way to deposit 400k to bank account 2 month before application for extension.

Then, when you build your extension story, you may proceed with "swear letter" for 2nd - Xnd times. But I absolutely recommend to have proof of money transfers for previous 12 months in case imm ask you.

And, you can't use "WP" reason for extension in first year anyway, even if your wage above 40k, because of one requirement - you will need tax form 91, and if you work less than a year you simply can't get such form from your accountant.

@Nicolas *******

you can get an extension of stay based on employment if you are making minimum wage. I don’t know what the minimum wage is for people from your nationality

Note: there is no minimum wage for teachers