Amit if you are liable to deduct TDS but fail to do so then you will be liable to pay interest & may also incure penalty and the expenditure incured can be disallowed if TDS is not paid within due date for filling the income tax return.
Person incurring expenditure is the person liable to deduct & pay TDS where the rent payment exceeeds INR 180,000/- and in this case it will be Rent Payee.
Further if you fail to deduct TDS then you will be liable to pay interest & may also incure penalty and the expenditure incured can be disallowed if TDS is not paid within due date for filling the income tax return.
Its is the responsible of payer to deduct tds every month and remit the same if the rent amount exceed rs 180000. But however if the payer fails, but the receiver paid tax on that rent and produce a certificate from CA stating that the rent received shown as income and tax due has been paid. In this situation there's no problem for payer. He can claim the exp even if he not deducted tds.