I received a notice for not depositing TDS on sale of property.

Buyers of property must deduct TDS from payment made to seller, if the sale price exceeds Rs 50lakhs. TDS has to be deducted @1% at the time of making payment to the seller. (as per section 194IA of the income tax act)

If you are a buyer who's received a notice, read this post on the next steps to correct the situation.