The National Pension System (NPS) is a government-backed market-linked scheme that provides pensions based on the invested amount and the performance of the assets in the annuity plan. Upon retirement, the subscriber can withdraw up to 60 per cent of the accumulated corpus in a lump sum tax-free or systematically at fixed intervals, and the rest has to be invested in an annuity plan. The income from the annuity is taxed as per the tax slab rates.