If an NGO gets itself registered under section 80G then the person or the organisation making a donation to the NGO will get a deduction of 50% from his/its taxable income. The NGO has to apply in Form No. 10G As per Annexure-29 to the Commissioner of Income Tax for such registration. Normally this approval is granted for 2-3 years.
The Finance Act, 2009, has deleted the five year restriction under proviso to sub section (5) clause (vi). In other words, registration certificates issued after 1st October, 2009 can be considered as one time registration unless any specific restriction is provided in the certification itself.