Step 1. Claim 80C 100000 in PPF and Senior Citizen Scheme because both are principal deductible and interest free. Step 2. For your child 80E Interest on studies say 15000 p.a. Step 3. For your parents (Senior citizen )and spouse 80D =35000 (20000 for senior and 15000 for spouse). Step4. 80DD Flat deduction of rs.75000 on relative with autisim or blindness or mental retardation. Hence you are saved from tax with help of your family members