In vinod gupta's income tax book it is mentioned that in the case of salary to non resident even if there is one day delay in depositng the TDS then salary will not be allowed as deduction.
however in Vinod kumar singhania's ready reckoner it is mentioned that it will be allowed if the same has been paid even after the due date of depositing the TDS.
i have checked the bare act on the incometaxindia.gov.in and it is similar to VKS view.
12 September 2012
The theme is if it is paid before due date, the expenditure will be allowed this year. If paid after the due date, the expenditure will be allowed next year.