09 March 2011
See your Gross Total Income : say 500000/ Deduct all Section 80 benefits say 125000/-
Your adjusted Gross Total Income 375000/ You can donate any amount but Qualifying amount will be 10% of 375000/ here. As you have donated 80000/ but qualifying amount is 37500/- Your deduction will be 50% of the qualifying amount U/s 80G.