The National Pension System (NPS) is a government-run pension scheme with the objectives of providing income during retirement, reasonable market returns, and expanding pension coverage. Subscribers receive a unique Permanent Retirement Account Number (PRAN). Contributions to NPS are eligible for tax benefits. Subscribers can choose from Tier I savings accounts with withdrawal restrictions or Tier II voluntary savings accounts. Funds are invested in equity, government bonds, and corporate bonds according to the subscriber's age. At least 40% of the corpus must be used to purchase an annuity on maturity.