I'm a Canadian and send your tax page which shows your pension income to the Canadian Embassy in Bangkok( you can get the Embassy form to download on their website)The cost is $50 and the process takes 2 weeks AND is ACCEPTED by the Thai Immigration instead of the
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baht per month or the
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0 per year in a Thai bank,
The system for us Canadians is very simple, I used this program 2 months ago, hope this answers you questions.