There is ceiling limit upto which the benefit is allowable to the donor. If the amount of deduction to a charitable organisation or trust is more than 10% of the Gross Total Income computed under the Act (as reduced by income on which income-tax is not payable under any provision of this Act and by any amount in respect of which the assessee is entitled to a deduction under any other provision of this Chapter), then the amount in excess of 10% of Gross Total Income shall not qualify for deduction under section 80G.
In other words, while computing the total income of an assessee and for arriving at the deductible amount under section 80G, first the aggregate of the sums donated has to be found out. Then 50 per cent of such donations has to be found out and it should be limited to 10 per cent of the gross total income. If such amount is more than 10 per cent of the gross total income, the excess will have to be ignored.