你的收入须要缴税因为你在家里(=在马来西亚)執行你的工作(Derive or accrued from Malaysia)
除非你是在外国工作。
所以重点是在你在那里執行你的工作而不是那里收到外国的收入。
Income derived from Malaysia and received in Malaysia by resident individual is TAXABLE. Income derived from outside Malaysia and received in Malaysia by resident individual is exempted from tax.