What are the major assessments under the Income-tax Law?
Under the Income-tax Law, there are four major assessments as given below:

section 143(1), i.e., Summary assessment without calling the assessee i.e. taxpayer.
Assessment under section 143(3), i.e., Scrutiny assessment.
Assessment under section 144, i.e., Best judgment assessment.
Assessment under section 147​, i.e., Income escaping assessment.​