Teaching in Thailand/labor law

The government school I work at takes 10,000 baht from our salary (in total) the first few months of the year. A so called “deposit” that they only return when teachers leave the school at the end of the term or the year. Basically it’s an implicit threat: “stay here or we keep your 10,000 baht”. And this year they’re increasing it to 15,000 baht.

Is this actually legal? If not is there anything I can do about it? If your school does this too, please comment below. I’m curious how widespread this is.

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