Exp will not be disallowed so long as the TDS deductible thereon has been fully deducted and paid to govt before due date for furnishing the return of income.
Assessee will have to pay simple interest on late payment of TDS @ 1% p.m. However, exp will not be disallowed even if such int has not been paid before the said due date provided TDS has been fully paid
Even if the part of TDS remains unpaid as on the said due date the entire exp will be disallowed