Sorry, but that raises so many questions, e.g.:
1. 'Income' from when, 1975 (or whenever it was earned), since residing in Thailand, or just for the tax year?
2. If I hold $20,000 in savings, had a taxable income overseas of $5,000 last year, and transfer $3,000 to Thailand, how does the Thailand Revenue Department know whether such transferred money came out of my savings, or last tax year's income?