NSC Tax Treatment: How Accrued Interest Saves You Money

The accrued interest reinvestment rule makes NSC more tax-efficient than it appears. Here is exactly how it works with a year-by-year breakdown.

1.Year-by-year interest breakdown on ₹1.5 lakh NSC

At 7.7% compounding: **Year 1**: ₹11,550 interest (deemed reinvested). **Year 2**: ₹12,440 interest (deemed reinvested). **Year 3**: ₹13,398 interest (deemed reinvested). **Year 4**: ₹14,429 interest (deemed reinvested). **Year 5**: ₹15,538 interest (paid out at maturity). Total interest = ₹67,355. Only Year 5 interest of ₹15,538 is taxable if you claim accrued interest as 80C in years 1-4.

2.How the 80C reinvestment claim works

Each year, declare the accrued interest as income under "Income from Other Sources" and simultaneously claim it as 80C deduction (since it's "deemed reinvested" in NSC). Net tax impact in years 1-4: zero. In Year 5, the ₹15,538 is taxable because it's actual payout, not reinvestment. At 30% bracket, tax = ₹4,661. Effective tax on ₹67,355 total interest = only ₹4,661 — an effective tax rate of 6.9% vs 30% on an FD.

3.Documentation for ITR filing

To claim the accrued interest 80C deduction: show NSC certificate (physical or digital from post office) as proof. Declare accrued interest under "Income from Other Sources" in ITR. Claim the same amount under Section 80C investments. Keep the calculation sheet for each year. Most tax-filing software like ClearTax or ITR portal handles this — select "NSC accrued interest" in the 80C section.

4.Key takeaway

The accrued interest 80C treatment is NSC's hidden advantage over FDs. It effectively reduces your tax burden on interest from 30% to about 7%. Use our NSC calculator to see your exact maturity amount and factor the tax savings into your comparison with other 80C instruments.