Hi,
You are paying totally Rs.18000/- Pm to your Landlord. You are deducting TDS for Rs.15000/- that is fine and rest of Rs.3000/- also you have to deducte the TDS becuase the section says that the rent amount is below Rs 12000/- annual you are not to deduct the TDS or otherwise you have to deduct the TDS. In your case
You are giving chq amount of Rs.18000/-Pm annually 2,16,000/- the section saying that more than Rs 120000 u will dedcut Tax, so you are going to deducte Tax on 3000 also.
If you are paying different part than your decision is okey or otherwise you are going to deduct Tax for 3000 also. becuase the section is not mention the area only amount of payment to a singal party.