To get tax exemption for the NGO/ charitable trust has to register themselves with income tax under section 12A , Section 12AA & Section 80G of income tax act, 1961.Apply for registration u/s 12A & 80G (both application can be applied together or separately also)NGO will receive notice for clarifications from Income Tax Department in 2-3 months after applyingReply of notice will be submitted by the responsible person of NGO along with all relevant desired documents to the Income Tax DepartmentsExemption Certificates will be issued.12A and 80G Application may be rejected if CIT is not satisfied with the documents submitted by NGO/ charitable trust.Roughly it will take 3u20135 months to get registered for Section 12AA & Section 80G.Trust this clarifies your query.In case you need any help reach out to us: Dsssvtax[at]gmail[dot]com and we can help you on taxation matters.You can also call /whatsapp us : 9052535440.