Non-performing assets (NPA) are loans or advances that the lender fails to recover within a stipulated and extended period. Banks conduct auctions from time to time to sell these assets. Here are some tips to check before buying an NPA: 1. Visit the site, 2. Check for dues, 3. Ascertain the reason for the discount, 4. Market value, 5. Mutation deed, 6. Possibility of loan.