Do you have any other USA source income or tax withholding in the current year? Has a US payer, such as a casino, a bank or financial institution withheld tax on payments to you (such as interest, dividends or winnings and possibly issued you a Form 1042-S or Form 1099)? In many cases the US payer over-withholds because you’re often entitled to a treaty benefit of a lower tax rate
You can claim a refund of that over-withholding on a tax return (our office prepares such returns).
You're in the above situation and you're already annually filing a US return to report US property rental income/loss or sale income/loss? Combine your reporting onto the same return as your rental income return. (our office prepares such returns)