The honest answer is that fixed deposits and corporate bonds are not competing for the same money. Once you see why, the choice stops being a puzzle and becomes a matter of matching the instrument to the job.
Put them on equal terms first
Most FD-versus-bond comparisons are unfair in one of two ways.
They compare headline rates. A "7% FD versus an 11% NCD" comparison ignores that both are taxed at your slab rate, so the real gap is smaller than four points, though still real. Compare post-tax. The FD vs bond calculator applies your slab to both.
They ignore compounding differences. Bank FDs conventionally compound quarterly, so the effective annual return sits a little above the stated rate. Bond coupons are paid out and only compound if you actively reinvest them. A fair comparison accounts for this, and it slightly favours the FD, opposite to the usual assumption.
Make both adjustments, and on typical numbers a good-quality NCD still comes out ahead of an FD of the same tenure by a meaningful margin. The question is what that margin is buying.
What the extra yield pays for
| Fixed deposit | Corporate bond / NCD | |
|---|---|---|
| Insurance | DICGC cover up to ₹5 lakh per bank | None |
| Early exit | Break it for a small rate penalty, cash in a day | Sell on the exchange; may face a discount or no buyer |
| Outcome certainty | Known at the outset | Depends on the issuer, and on rates if you sell early |
| Yield | Lower | Higher, to compensate for all of the above |
The yield gap is compensation for taking on one company's credit risk, accepting worse liquidity, and giving up certainty. Whether that is a good trade is a judgement, not a calculation. What is credit risk in bonds covers what the insolvency process actually looks like.
A worked comparison
₹5,00,000 for 3 years, 30% slab, comparing a 7.25% FD against a 10.5% AA-rated NCD:
| FD | NCD | |
|---|---|---|
| Interest earned | ₹1,20,258 (compounds quarterly) | ₹1,57,500 (coupons paid out) |
| Tax at 31.2% | −₹37,520 | −₹49,140 |
| Interest kept | ₹82,738 | ₹1,08,360 |
The NCD leaves you about ₹25,600 ahead over three years, roughly ₹8,500 a year, for taking AA credit risk on one issuer with no DICGC cover and much thinner liquidity. Run your own numbers in the calculator.
When each is the right answer
Choose the FD for:
- Money you might need at short notice. Emergency funds, near-term goals.
- Amounts within the ₹5 lakh insured limit, where the guarantee is real.
- Any situation where a downgrade headline about the issuer would cost you sleep.
Choose the bond for:
- Money you can genuinely leave until maturity.
- Amounts large enough that the yield difference is material in rupees.
- Cases where you have actually looked at the issuer, not just the coupon.
Most people use both. A base of insured deposits covering near-term needs, with bonds for money that can be committed for the full term, and bond money spread across several issuers, because the loss from a single default is what does the real damage.
The discipline
If the yield gap does not clearly compensate you for the risk gap, take the FD. A few thousand rupees of extra annual interest makes a poor trade against a low but real chance of losing a large slice of principal. The bond has to earn its place. The FD is the default.
The takeaway
FDs and bonds do different jobs. FDs are for safety, liquidity and certainty within the insured limit. Bonds are for extra yield on money you can lock away, in exchange for real credit and liquidity risk. Compare them post-tax, and pick the bond only when the margin is big enough, and the issuer good enough, to be worth what you are giving up.