If you are officially employed, you can also ask HR for salary certificate showing that your salary is more than
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baht a month, include at least 4 months of bank statement that show regular income payments. You can also attach your thai spouse salary certificate and sponsership letter as a supporting documents. For 1 year extension based on income, you will need income affiditive from the embassy, and a lawyer, so everything is done properly. If you go by 400 000 deposit, it can be any bank in the world, does not have to be thai bank for 90 days, for 1 year extension it has to be thai bank