Simple Chart of Reduction in Corporate Tax Rates announced on 20th September:

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Sr. No.	Applicable to	New Tax Rate	Effective Tax Rate [After SC & EC]	MAT	Rider	Optional to whom
1	Domestic Companies	22%	25.17%	MAT shall not applicable	Shall not avail any exemption & incentive like available u/s 10AA, Additional Depreciation, Chapter VI-A except 80JJAA	Company enjoying tax holiday subject to MAT @ 15%. However after that they can opt for this.
2	New Domestic Companies (Incorporated after 1st Oct, 19 but commences production before 31.03.2023)	15%	17.01%	MAT shall not applicable	Shall not avail any exemption & incentive like available u/s 10AA, Additional Depreciation, Chapter VI-A except 80JJAA	NA