Investment amount refers to the maximum permissible investment within the scheme. To avail tax benefits u/s 80C you must restrict the investment to an amount up to Rs 1.5 lakhs. Expert Advice: If you wish to save taxes over and above the limit of section 80C, NPS serves the best scheme to opt for. it gives you the additional benefit of Rs. 50,000 under section 80CCD(1B).