There is not a fixed % of TDS to be deducted from salary.
TDS is to be deducted from salary as per slab rates applicable to each employee.
Work out TDS on salary as under,
Gross salary XXXX Less: Exempted allowances XXXX (i.e. transport allowance,HRA etc.) Less: Deduction under chapter VI XXXX =Net taxable salary XXXX
If net taxable salary does not exceed basic exemption limit then no TDS.
If it is above basic exemption limit (i.e. 3 lacs for sr. citizen, and 2.5 lacs for others) then calculate tax thereon (in present case it will be 10%)
From this tax amount deduct rebate u/s. 87 A (Rs.2000 or tax whichever is lower) on balance amount if any add edu. cess @ 3% the resulting figure will be total TDS to be deducted during the financial year.