Q18: My return included a request for a refund of tax withheld on a Form 1042-S, Foreign Person's U.S. Source Income Subject to Withholding. When can I expect my refund?|
If you requested a refund of tax withheld on a Form 1042-S Foreign Person's U.S. Source Income Subject to Withholding by filing a Form 1040NR U.S. Nonresident Alien Income Tax Return, we will need additional time to process the return. Please allow up to 6 months from the original due date of the 1040NR return or the date you actually filed the 1040NR, whichever is later to receive any refund due.
Source: http://www.irs.gov/Refunds/Tax-S ... tly-Asked-Questions