Salary Components might not be getting displayed in Income Tax Computation sheet under below-mentioned scenarios:

1. TaxableSalary Components has to be configured as TAXABLE, so, please check the Salary Components configuration whether it marked as TAXABLE under Settings >> Salary Components

2. Component Mapping: If exemptions need to be displayed then please ensure whether Salary Components are mapped under Transactions >> Income Tax Compliance >> click on IT Mapping link. And check whether appropriate employees' Declaration has been done