Hi,
TDS on salary to be deducted , when after taking all the income from other sources and taking all the deductions into consideration. there is still taxable income.
1) if the gross salary of the employee is more than taxable slab (income tax slab) and after deductions under section 80cce (for which employee is required to give documents proofs) there is taxable income, then TDS is need to be deducted @ average rate.
so ans for ques 1 & 2 is NO
3) Yes, as per section 194 C, if the one time payment of a contractor exceeds Rs 30000/- then TDS has to be deducted.
or Aggregate amount of such sums credited or paid exceed and likely to exceeds Rs. 75,000 (Rs. 1 Lakh from financial year 2016-17).
4) tax slab is same as income tax slab.
5) yes, you can apply for TAN online, Once you get TAN, you are required to deposit TDS on time and file TDS return regularly.