Annual salary of 600,000 baht
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Annual salary: 600,000 THB
Total allowances: 60,000 THBExpected result
Expenses: 100,000
Taxable income: 440,000
Estimated tax: 21,500 THB
Marginal bracket: 10%150,000 is exempt; the next 150,000 × 5% = 7,500; the remaining 140,000 × 10% = 14,000. Total: 21,500.