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Section 80 G Tax Rebate
If you pay a donation to any recognised charity or relief fund, a part of the donation can be claimed as an expense. This means that the donation paid is reduced from your salary, so your tax liability reduces. The charity needs to give you a certificate to this effect, which it would if it were recognised under this section.
A few organisations like the Prime Minister's Disaster Fund enjoy 100% deduction- which means the entire donation paid is deductible from your salary. However, most other donations including several religious organisations enjoy only a 50% deduction. If you pay Rs.1,000 to such an organisation, you can show Rs.500 as expense.