I suppose you are talking about payment being made to an employee..
here, if the expense incurred by the employee is for official purposes then, the payment made to him would be reimbursement of expense and as such, would not be liable to TDS.
however, if the same is not for official purpose, then the payment would be termed as perquisite and as such liable to perquisite tax and therefore liable for TDS.
11 February 2013
if these are covered in the ambit of work which defined in sec 194 c, then tds to deducted ...generally on travelling exp. not attracted