4
Per month method is minimum
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baht each month. Can not be a bit less some months because you have a bit more other months.
If you did the
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0 baht deposit method, then you can use this deposit for all the coming years without worrying about the monthly deposits. (there are specific rules on when and how much your bank account can or can not go under the
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0 baht - be careful and I'd advise a dedicated account for this deposit.)
OR you can do a combination of the 2 methods : for instance
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per month and a
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0 deposit.