Buying property from NRI - TDS Query

I am buying a property in India from an NRI. Let's say the property cost is 80,00,000. I am paying 800000 at the time of sale agreement and remaining 7200000 at the time of sale deed and registration. Do I need to pay TDS to the TAN account at the time of sale agreement also or it's applicable only during the registration and sale deed.

Looking forward to the responses.

Thanks in advance.