Why does the interest qualify for a deduction?

Because it is reinvested in the scheme rather than paid to you, so it counts as a fresh investment. This applies to the first four years; the final year's interest is paid out and does not qualify.

Is the rate fixed for the whole term?

Yes, at the rate applying on the date of purchase. Later re-notifications change what new certificates pay and leave existing ones alone.

Is the interest taxable?

Yes, in the year it accrues. For many people the 80C deduction on the reinvested amount offsets it, but the two provisions are independent and the offset is not automatic.

Only in narrow circumstances, such as the death of the holder or a court order. Otherwise the certificate runs its term, which is the trade for the fixed rate.

NSC Calculator

National Savings Certificate maturity, with the reinvested interest shown.

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Result

The result appears here as you type.

Ask about NSC Calculator

Questions about what this tool does, which option to pick, or what it can and cannot handle.

The question you type here is sent to an AI provider to be answered — your files and whatever you put in the tool above are not, and the assistant cannot see them. Answers are generated and can be wrong. The tool itself is not guessing: it runs deterministic code on your device.

About the NSC Calculator

A National Savings Certificate is bought once, held for five years, and pays a rate fixed on the day of purchase. Nothing that happens to notified rates afterwards affects a certificate already bought, which makes it a way of locking a rate rather than tracking one.

Interest accrues yearly and is reinvested rather than paid out, so the certificate compounds. This has an unusual consequence at tax time. Because the reinvested interest is treated as a fresh investment in the scheme, it qualifies for a deduction under section 80C in each of the first four years, alongside your original purchase. The interest of the fifth and final year does not, since it is paid out at maturity rather than reinvested. So a certificate quietly generates its own deductions for most of its life, which is worth knowing when planning a year's 80C claim.

The interest is nevertheless taxable in the year it accrues. The deduction and the taxability offset each other for many people, but not for everyone, and the two are separate provisions that happen to point in opposite directions.

The tool shows the interest credited each year alongside the running value, which makes the compounding visible and gives you the figures to report annually. The rate is an input rather than a lookup, because it is re-notified each quarter and a certificate bought last year carries a different one from a certificate bought this week.

Certificates can be pledged as security for a loan and transferred in limited circumstances, but there is no early exit except in narrow cases such as the holder's death or a court order.

How to use it

1Enter the amount you are investing and the rate on the certificate you are buying.
2Leave the term at five years unless you are modelling a variant with a different one.
3Read the yearly interest column — those are the figures to declare, and to claim under 80C.
4Compare the maturity value against a tax-free scheme rather than against a headline bank rate.

Questions

Why does the interest qualify for a deduction?: Because it is reinvested in the scheme rather than paid to you, so it counts as a fresh investment. This applies to the first four years; the final year's interest is paid out and does not qualify.
Is the rate fixed for the whole term?: Yes, at the rate applying on the date of purchase. Later re-notifications change what new certificates pay and leave existing ones alone.
Is the interest taxable?: Yes, in the year it accrues. For many people the 80C deduction on the reinvested amount offsets it, but the two provisions are independent and the offset is not automatic.
Can I redeem early?: Only in narrow circumstances, such as the death of the holder or a court order. Otherwise the certificate runs its term, which is the trade for the fixed rate.