Bank FD vs Corporate FD vs Debt Fund: Post-Tax Returns Compared

The question usually arrives in the same shape. About ₹10 lakh is sitting idle, it will be needed in roughly three years, and someone has shown a table of FD rates. Now put that question in the mouths of three different people: one in the 30% bracket, one in the 20% bracket, and a retired teacher whose taxable income is under the new-regime rebate limit.

The right answer is different for all three. Not because the products changed, but because tax and risk hit each of them differently.

# First, the tax rules that decide this

# Bank FD interest

Interest is taxed at your slab rate under income from other sources. On a cumulative FD, the interest is credited only at maturity, but banks deduct TDS on the interest as it accrues each year and it appears in your AIS year by year. Offering it to tax on the same accrual basis every year is the cleaner practice; declaring three years of interest in the maturity year invites a mismatch with AIS and bunches income into one year.

TDS on bank interest is 10% once interest from one bank crosses ₹50,000 in a year, or ₹1,00,000 for senior citizens. From 1 April 2026 this sits under Section 393 of the Income-tax Act, 2025, and the self-declaration to avoid TDS when your tax is nil is Form 121, which replaced Forms 15G and 15H. TDS is not the tax. It is an advance; your slab decides the final number.

# Corporate FD interest

Taxed exactly the same way, at slab rate. The TDS threshold for interest from a company or NBFC is lower, at ₹10,000 a year.

The difference is protection. DICGC insures deposits with banks, including commercial banks, small finance banks, regional rural banks and cooperative banks, up to ₹5 lakh per depositor per bank, principal and interest combined. DICGC states explicitly that deposits with NBFCs are not covered. A corporate FD is a loan to that company, and the rating on it is an opinion, not a guarantee.

# Debt mutual funds

For units bought on or after 1 April 2023, gains on a "specified mutual fund" are deemed short-term capital gains regardless of how long you hold them, and taxed at your slab rate. This was Section 50AA of the 1961 Act; in the Income-tax Act, 2025 it is Section 76. From FY 2025-26, a specified mutual fund means a scheme that invests more than 65% in debt and money market instruments (or a fund that invests 65% or more in such schemes).

So the rate is now identical to an FD. What remains different:

• Timing. Tax arises only when you redeem. An FD is taxed every year.
• No TDS on redemption for resident individuals.
• No DICGC cover and no guaranteed return. The NAV moves with interest rates and with the credit quality of what the fund holds.

Units bought before 1 April 2023 still carry the older treatment on long-term gains; our mutual fund taxation guide has the detail.

# The worked example

Assumptions, not market quotes:

• ₹10 lakh for exactly 3 years.
• Bank FD at 7.0%, corporate FD at 8.0%, debt fund returning 7.0% after its expenses. All compounded annually for simplicity.
• FD tax is paid every year, so only the post-tax interest keeps compounding.
• Debt fund tax is paid once, on redemption at the end of year 3.
• Marginal tax rates of 0%, 20% and 30%, with 4% cess, which gives effective rates of 0%, 20.8% and 31.2%. Surcharge is ignored.
• No default, no premature withdrawal, no change in rates.

These marginal rates apply in both regimes. Under the new regime, 20% applies to income between ₹16 and ₹20 lakh and 30% above ₹24 lakh. Under the old regime, 20% applies between ₹5 and ₹10 lakh and 30% above ₹10 lakh. The "0%" row is for someone whose total income stays within the basic exemption or the new-regime rebate.

# What ₹10 lakh becomes after tax

Figures in brackets are the post-tax annualised return.

Read across the 31.2% row. The debt fund's entire gain of ₹2,25,043 is taxed in year 3, a tax of ₹70,213 in one shot. Even so it finishes ₹3,280 ahead of the bank FD, because that tax was deferred for three years and the money compounded in the meantime. In the 20.8% row the gap is ₹2,523. At 0% there is nothing to defer, so the two are identical.

# Deferral grows with time

Three years is short. Here is the same 7% bank FD versus 7% debt fund over longer holds.

Over ten years at 31.2%, the post-tax annualised return moves from 4.82% for the FD to 5.23% for the debt fund, on identical pre-tax returns.

# What the table leaves out

A few things do not fit into one row of numbers but change the answer in practice:

• Premature exit. Breaking a bank FD usually means a lower rate for the period actually held, less a penalty. Corporate FDs can restrict premature withdrawal more tightly. A debt fund can be redeemed any business day, subject to any exit load the scheme has.
• TDS cash flow. On a bank FD above the threshold, 10% is deducted every year even if your final tax is lower. You get it back only after filing the return. A debt fund has no TDS for resident individuals.
• Compounding frequency. Most bank FDs compound quarterly, which lifts the effective pre-tax yield slightly above the quoted rate. The example uses annual compounding for all three to keep the comparison like for like.

# The corporate FD's extra 1%

At 31.2%, the corporate FD finishes ₹22,825 ahead of the bank FD. That is the entire reward, over three years, for lending ₹10 lakh to one company without deposit insurance. A loss of about 2.3% of principal erases it. When a company deposit goes bad, the damage is rarely that tidy; the more common experience is money stuck for a long time with an uncertain recovery.

If you do use corporate FDs, a few habits limit the damage:

• Check the current rating on the rating agency's own site, not only the brochure, and watch for downgrades.
• Spread across issuers rather than putting a large sum with one.
• Read the premature withdrawal terms; many are more restrictive than bank FDs.
• Be wary when one issuer's rate is well above others with the same rating. The market is usually telling you something.

# Senior citizens: the regime decides the winner

The old regime gives senior citizens a deduction of up to ₹50,000 on interest from deposits with banks, cooperative banks and post offices. This was Section 80TTB; in the Income-tax Act, 2025 it is part of Section 153, which also carries the old 80TTA deduction. It is not available on corporate FD interest or on debt fund gains, and it is not available in the new regime.

Take a senior citizen in the old regime at the 30% slab, with ₹10 lakh in a bank FD paying 7% annually, and no other bank interest:

• Interest: ₹70,000. Deduction: ₹50,000. Taxable: ₹20,000.
• Tax at 31.2%: ₹6,240.
• Post-tax yield: 6.38%.

The same person in an 8% corporate FD pays ₹24,960 in tax on ₹80,000 and nets 5.50%. Without the deduction, the bank FD would net 4.82%. For the first ₹50,000 of interest, the bank FD is the better post-tax product for an old-regime senior even at a lower headline rate. Remember the ₹50,000 is a single limit across all your bank and post office interest, including savings accounts.

In the new regime, there is no interest deduction, and seniors get the same slabs as everyone else. What they do get is the rebate: total income up to ₹12 lakh bears no tax. The retired teacher from the opening is in that position, and for her the tax columns above are simply the 0% row. Her decision comes down to safety and liquidity, which pointed to bank FDs within the DICGC limit. Our senior citizen tax guide and old vs new regime guide cover the wider comparison.

# How I would decide

For Tax Year 2026-27 (FY 2026-27, the return you file in 2027, earlier called AY 2027-28):

• Nil or rebate-level tax. Tax deferral is worth nothing to you. Bank FDs within the DICGC limit usually win on safety for similar rates.
• 20% or 30% bracket, 3 years or less. Bank FD and debt fund are close. Choose on liquidity needs and on the fund's actual post-expense track record, not on tax.
• 20% or 30% bracket, 5 years or more. Deferral starts to matter. A debt fund with modest duration and high credit quality becomes a reasonable alternative, provided you can tolerate NAV movements.
• Old-regime senior citizen. Use the ₹50,000 interest deduction on bank or post office deposits first.
• Corporate FDs. Only for money you can afford to see stuck, spread thin, and never as the emergency fund.

Money you might need at short notice belongs somewhere else entirely. The emergency fund guide covers how much to keep and where. If a tax-saving FD is on your list, our 80C comparison shows how it compares with PPF and ELSS.

See every FD, debt fund and deposit in one place, with maturities and goals attached. VittSphere ONE's Net Worth Tracker and Goal Planner show where your fixed-income money actually is, and ARTHA answers the tax question for your specific regime. Start free →

# References (verified 23 September 2026)

• DICGC: A Guide to Deposit Insurance
• DICGC: FAQs
• Kotak Neo: Govt may raise bank deposit insurance cover to ₹7.5 lakh (5 June 2026)
• TaxTMI: Clause 76 of the Income Tax Bill, 2025 vs Section 50AA
• TaxTMI: Section 76 (new) / Section 50AA (old)
• TaxTMI: Amendment to definition of specified mutual fund under Section 50AA
• Upstox: Income Tax Act 2025, tax-saving sections for senior citizens (Section 153)
• Taxguru: Form 15G/15H vs Form 121 under the Income-tax Act, 2025
• Tax Garden: TDS on bank FD interest, FY 2026-27
• ClearTax: Income tax slabs FY 2026-27

Disclaimer: This article is educational and general in nature. VittSphere ONE is not a SEBI-registered Investment Adviser, not a bank and not a deposit-taking entity, and does not recommend any specific bank, NBFC, company deposit or mutual fund. The interest rates and returns used are assumptions for illustration, not current quotes or forecasts; debt fund returns are not guaranteed and corporate deposits carry credit risk. Calculations assume annual compounding, ignore surcharge and assume no default. Tax treatment depends on your full income and chosen regime; consult a CA for your own case. Data verified 23 September 2026.

Written by

Prabhakar Kumar

Chartered Accountant (ICAI, Nov 2019)

Chartered Accountant (FCA, ICAI) and founder of VittSphere Technologies. Writes on Indian taxation, capital gains, GST and personal finance.