NSS has a duration of four years as compared to NSC, which has a duration of six years. You can extend the duration of your NSS units thereafter if you so desire.

NSS does not offer the benefits of liquidity. There is no premature withdrawal facility except in case of the death of the holder. However, the interest accrued on NSS can be withdrawn at any point. The deposit (principal) can be withdrawn only on maturity of the instrument at the end of four years and the account can be closed at the discretion of the investor.

• NSS is mostly viewed upon as a tax-saving instrument. It combines growth in money (capital appreciation) with cuts in tax outgo, albeit at a lower rate.
• NSS is not meant for earning regular income. It serves primarily as an instrument to reduce tax liability.
• Since the NSS has a fixed rate of return, it cannot provide adequate safeguards against high inflation rates.
• It is a savings plan that also offers tax benefits, and it cannot be pledged as security to any bank for availing a loan.
• Your income is assured at the specified rate of interest. Since the NSS has the backing of the GOI, this is a risk-free avenue of investment.
• The NSS has the backing of the Government Of India. Therefore, you can be assured of getting back your full investments. This is a safe option to go in for, as the risks are minimal.
• Since the NSS is backed by the Government Of India, it requires no commercial rating, and is deemed to be a risk-free investment.

The NSS offers tax incentives as per the provisions of the Income Tax Act, 1961. You can avail of rebates on both the principal invested as well as the interest income under Section 88 of the Income Tax Act. The annual interest income qualifies for exemption under Section 80L, i.e., interest income upto Rs 9,000 is tax-exempt. Moreover, interest income is not subject to TDS.

NSS units are held physically in the form of certificates that are issued to the investors by the post office.