In terms of international cross-currency transfers, you can send up to S$9,000 each month for free. You will see a market-low 0.5% fee applied if exceeding this threshold.
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The beneficiary bank may also charge a fee to receive your transfer. When your money is in transit, it may be processed by an intermediary bank who could also apply a handling fee. In simple terms, the amount received at the other end might be less than the amount that you sent.