If you requested a refund of tax withheld on a Form 1042-S (PDF) by filing a Form 1040-NR (PDF), allow up to 6 months from the original due date of the 1040-NR return or the date you filed the 1040-NR, whichever is later, to receive any refund due.
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Blessed are they who expect nothing for they shall not be disappointed !!