How do I get the NCB letter?

[Rahul]

Hi I have sold my car and the original RC & Insurance has been given to the buyer of my car. Am buying a new car now. how do i get the NCB letter?

First check that the new buyer has bought new insurance for his car.
If he transferred your insurance in his name then you won't get NCB for new car.

Should I cancel the policy to get the ncb declaration letter?

You will have to tell the insurer that you won't want to transfer your insurance to new user. You also need to submit the new insurance policy copy of your sold car, to show that it is insured. Then you can ask for NCB letter from insurance company or the old policy will do the purpose.