HDFC Bank 18-Month Fixed Deposit: October 2026 Rates, TDS and DICGC Cover

Summary: HDFC Bank’s published domestic fixed-deposit rate schedule applicable from 19 August 2026 lists 6.45% per annum for general depositors and 6.95% for eligible senior citizens in the “18 months to less than 21 months” tenure bucket for deposits below ₹3 crore. An 18-month domestic term deposit falls within that bucket, but the applicable rate must be confirmed at actual booking or renewal and depends on deposit amount, residency, age eligibility and product type. The bank’s published terms distinguish ordinary callable deposits from non-withdrawable deposits and explain that premature withdrawal can result in interest recalculation and a 1% penal adjustment under the applicable terms. Interest on an ordinary fixed deposit is generally taxable under the Income-tax Act, 2025 for Tax Year 2026–27. Section 393(1), Table serial number 5(ii), provides the specified banking-interest tax-deduction thresholds of ₹50,000 for a person other than a senior citizen and ₹1,00,000 for a senior citizen; these are withholding thresholds, not tax-free allowances. Eligible bank deposits, including accrued interest, are covered by the Deposit Insurance and Credit Guarantee Corporation only up to ₹5 lakh per depositor per insured bank in the same right and capacity. This factual explainer reviews the official rate date, payout alternatives, illustration methodology, withdrawal conditions, taxation and insurance without recommending, comparing or predicting investment returns.

What Is the Specific HDFC Bank Deposit Covered Here?

This article examines a domestic, ordinary callable fixed deposit of exactly 18 months placed with HDFC Bank by an eligible resident depositor, with principal below ₹3 crore. It does not cover a non-withdrawable bulk deposit, NRE or NRO deposit, tax-saving five-year deposit, sweep-in arrangement with special terms or an FD booked at a different rate on an earlier date. The phrase “18-month FD” identifies the contractual tenure; the official rate card groups that tenure with deposits of at least 18 months but less than 21 months.

HDFC Bank’s official deposit-rate schedule displays the below-₹3-crore domestic/NRO/NRE table as applicable from 19 August 2026. For the 18-to-less-than-21-month band it shows 6.45% for the general category and 6.95% for eligible senior citizens. A promotional banner elsewhere on the same page can show a different historical effective-date caption; the tenure-specific table and booking advice should control the rate identified for this analysis. The bank warns that interest rates may change, so the actual contracted rate must be verified when funds are accepted.

The official rate and eligibility snapshot

The 50-basis-point senior premium in this band is not a universal benefit for every account holder aged 60 or older. The bank’s rate schedule states that senior-citizen rates do not apply to NRIs. Joint accounts, depositor age, residency status, ownership and the product selected in the booking channel can affect eligibility. The customer should preserve the term-deposit advice, which records principal, tenure, maturity date, payout instruction and contracted interest rate. This is particularly important when a deposit is automatically renewed at the rate then prevailing.

Callable Versus Non-Withdrawable Deposits

A normal callable FD generally permits early closure subject to bank rules and interest adjustment. HDFC Bank’s published notes explain that, for relevant deposits, premature withdrawal including sweep-in or partial withdrawal can lead to a rate one percentage point lower than the rate applicable on the booking date for the period the money actually remained with the bank, rather than the originally contracted 18-month rate. This is not a promise that every partial withdrawal request will be accepted. Amount thresholds, deposit type and other conditions must be checked against the bank’s terms.

Non-withdrawable deposits are a separate product category with restricted premature closure, generally available only for specified larger deposits and subject to exceptional circumstances. A depositor must not compare a non-withdrawable rate with the ordinary 18-month callable rate as though both have identical liquidity rights. The fact that the deposit is held with the same bank does not make the two contracts interchangeable. For the specific sub-₹3-crore ordinary deposit considered here, the applicable callable terms should be confirmed in the actual booking documents.

Why premature closure changes the effective return

Assume an 18-month FD was booked at 6.45% and the customer seeks closure after eight months. The relevant rate is not automatically eight-twelfths of 6.45%. The bank may first determine the rate that applied on the original booking date to the actual eight-month holding period, then apply the specified premature-closure adjustment, subject to product terms. The result may differ substantially from a simple pro-rata calculation. If the depositor needs liquidity, a loan against the deposit or partial withdrawal may have separate charges and eligibility; this article does not recommend one course of action.

Interest Calculation: Cumulative and Payout Options

For a deposit longer than six months, HDFC Bank’s published method describes quarterly interest calculations. Under an interest-reinvestment or cumulative option, interest for a quarter is added to principal for the next quarter. Under quarterly payout, interest is credited to the customer rather than compounded into the deposit. Under a monthly payout, the bank uses a discounted rate relative to the standard rate. These payout choices can produce different cash-flow and maturity figures even where the nominal annual card rate is the same.

For a simplified illustration only, take ₹1,00,000 invested for six equal quarters at a nominal annual rate of 6.45%, with quarterly compounding and no withdrawals. The arithmetic is ₹1,00,000 × (1 + 0.0645/4)^6, giving approximately ₹1,10,073.51, or interest of ₹10,073.51. At 6.95%, the same simplified formula gives approximately ₹1,10,888.46, or interest of ₹10,888.46. These are mathematical examples, not the bank’s certified maturity quotes: the bank calculates interest with actual days, leap-year effects, its booking convention, rounding and the chosen payout instruction.

What the calculation does not include

The examples exclude TDS, any other income-tax liability, penalty on early closure, bank charges, change in principal and any rate revision before booking. They also assume six identical compounding periods rather than using actual calendar days. If the FD begins in October 2026, its 18-month maturity may fall in April 2028, so interest can span more than one Indian tax year. The taxpayer should maintain annual interest certificates and avoid offering the same accrued interest twice merely because the maturity amount is received later.

Income Tax on HDFC Bank FD Interest in Tax Year 2026–27

The Income-tax Act, 2025 applies from 1 April 2026. Ordinary resident bank-deposit interest is generally taxable as income from other sources, unless a particular business context and accounting facts support another treatment. The bank’s contractual interest rate is not a post-tax rate. Neither an 18-month tenure nor the absence of TDS makes the interest exempt. The owner should consider the applicable method of accounting, beneficial ownership, accrued interest already returned in prior periods and the final interest certificate.

Under section 393(1), Table serial number 5(ii), specified bank-interest withholding thresholds are ₹50,000 for a person other than a senior citizen and ₹1,00,000 for a senior citizen. The ordinary resident TDS rate is generally 10% where applicable and valid PAN conditions are met. The threshold concerns tax deduction at source and is not an income-tax exemption. If a person earns ₹60,000 taxable interest in a year, the relevant withholding rule is applied to the statutory base, not merely to the ₹10,000 amount exceeding the ₹50,000 threshold. The bank may aggregate qualifying interest across branches under the relevant provisions.

Form 121 and other withholding safeguards

For Tax Year 2026–27, eligible resident individuals may submit Form 121 under the 2025 Act and applicable Income-tax Rules where the statutory conditions for a no-deduction declaration are satisfied. The declaration is not automatically available to every person with interest below a particular level and does not change the ultimate taxability of the interest. The customer must estimate total tax-year liability truthfully, comply with PAN and eligibility requirements and obtain acknowledgement from the payer. TaxGuru’s Form 121 guide for FD interest discusses the transition from the older Forms 15G and 15H.

Non-resident deposits require a separate review. The bank’s 6.95% senior-citizen domestic rate should not be carried over to NRO or NRE accounts, and the resident TDS threshold should not be applied mechanically to non-resident interest. The taxability of NRE interest can depend on qualifying non-resident status and statutory conditions, whereas NRO interest generally follows a different tax and withholding framework. This article does not purport to calculate tax on non-resident deposits.

GST and Other Tax Distinctions

Interest paid as consideration for the use of money under an ordinary deposit is generally treated differently from a taxable banking service fee for GST purposes. The GST exemption framework covers specified services by way of extending deposits, loans or advances where consideration is represented by interest or discount. That does not mean every separately charged banking service, documentation charge or account fee is exempt. Any actual GST invoice for a distinct banking service should be reviewed on its own facts. For income tax, the interest remains assessable even though the GST treatment of the interest transaction is exempt.

An ordinary 18-month HDFC Bank FD is also not a five-year tax-saving fixed deposit. A deduction that requires investment in a specifically prescribed five-year deposit cannot be claimed solely because the bank is eligible or the customer has held an ordinary FD for more than one year. The applicable tax regime and tax-year conditions must be checked independently. A higher senior-citizen interest rate is a bank product term, not an additional statutory income-tax deduction by itself.

DICGC Cover: Principal and Interest Share One ₹5 Lakh Limit

The DICGC official deposit-insurance guide confirms that eligible principal and accrued interest at an insured bank are aggregated up to ₹5,00,000 per depositor per bank in the same right and capacity. This is not a separate ₹5 lakh limit for each FD certificate or each branch. Savings, current, recurring and fixed deposits in the same legal capacity at the same insured bank are considered together, subject to the statutory exclusions and ownership rules. Deposits at different insured banks are separately assessed; genuine differences in ownership capacity can also matter.

For example, if a depositor holds ₹4,90,000 of principal and ₹30,000 accrued interest at the same insured bank in the same capacity, the combined amount is ₹5,20,000. The ordinary DICGC ceiling would cover at most ₹5,00,000, leaving ₹20,000 above that ceiling. A separate ₹2 lakh FD at another branch of the same bank does not create a new limit for the same person and capacity. TaxGuru’s deposit-insurance explainer discusses this aggregation principle; the official DICGC guide remains controlling.

Insurance is not a liquidity or return guarantee

DICGC insurance operates under specified statutory circumstances; it is not an assurance that a depositor can always withdraw the full balance on demand or that an uninsured amount will be recovered immediately. Deposit insurance also does not insure a future interest rate, opportunity cost or the outcome of a premature-withdrawal request. Before booking, customers should separately record the contractual maturity, premature-closure terms, nominee and ownership capacity. Business entities should evaluate cash-equivalent classification, liquidity and accrued interest under their applicable accounting standards.

Documents to Preserve for Tax and Deposit Reconciliation

Retain the deposit receipt, date of booking, principal, applicable effective-date rate, age and residency declaration, payout choice, maturity instruction, nomination and account details. For each tax year, preserve the interest certificate, TDS statement, Form 26AS or AIS reconciliation and any valid Form 121 declaration. If the deposit is renewed, obtain the fresh rate and maturity advice rather than assuming the original 6.45% or 6.95% continues. If it is closed early, obtain the bank’s calculation showing the actual-period rate and penalty applied.

As at 16 October 2026, the relevant official table reviewed for an ordinary sub-₹3-crore 18-month domestic FD is effective from 19 August 2026 and lists 6.45% general and 6.95% eligible senior. The applicable legal rules on taxation, TDS and deposit insurance arise from different statutes and should not be inferred from the bank’s marketing description. This article records verifiable product facts and compliance distinctions only; it does not rank the deposit, recommend a purchase or predict future interest rates.

Frequently Asked Questions

1. What is HDFC Bank’s published 18-month domestic FD rate in October 2026?

For an ordinary deposit below ₹3 crore, the table effective 19 August 2026 lists 6.45% general and 6.95% for eligible senior citizens in the 18-to-less-than-21-month bucket.

2. Does every depositor aged over 60 receive 6.95%?

No. The bank’s eligibility and residency rules apply; its published senior rates do not apply to NRIs.

3. Is 6.45% the guaranteed rate on a future booking date?

No. The contractual rate is the rate accepted under the applicable product and schedule when the deposit is actually booked or renewed.

4. Can the 18-month callable FD be closed before maturity?

Ordinary callable deposits generally permit closure subject to applicable bank conditions and recalculation of interest, including relevant premature-withdrawal adjustment.

5. Is interest on an 18-month FD tax-free?

No. Ordinary FD interest is generally taxable; section 393 bank-interest thresholds govern TDS, not exemption from income tax.

6. What are the resident bank-interest TDS thresholds for Tax Year 2026–27?

Section 393(1), Table serial number 5(ii), specifies ₹50,000 for non-senior persons and ₹1,00,000 for senior citizens, subject to the statutory conditions.

7. Does DICGC insure each HDFC Bank FD separately up to ₹5 lakh?

No. Eligible deposits and accrued interest are aggregated per depositor per insured bank in the same right and capacity, subject to one ₹5 lakh ceiling.

Key Takeaways

• The bank’s sub-₹3-crore 18-month domestic rate bucket effective 19 August 2026 shows 6.45% general and 6.95% eligible senior.
• An 18-month callable FD is not the same as a non-withdrawable deposit or five-year tax-saving deposit.
• Quarterly reinvestment, monthly payout and premature withdrawal produce different cash-flow outcomes.
• Section 393 of the Income-tax Act, 2025 governs specified bank-interest withholding; TDS thresholds are not tax exemptions.
• DICGC generally aggregates eligible principal and interest to a ₹5 lakh ceiling per depositor per insured bank in the same capacity.

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Disclaimer: This article is an informational TaxGuru editorial based on official material reviewed on 16 October 2026 and is not an offer, advertisement, recommendation, ranking, forecast, personalised investment advice, tax opinion or assurance of future interest rates. The bank may revise rates and terms, and eligibility, contracted yield, interest credit, maturity, penalties, tax, withholding, insurance and liquidity depend on individual circumstances and the product actually booked. Illustrative interest amounts use a simplified equal-quarter mathematical assumption and are not bank quotations. Readers must independently confirm current HDFC Bank documents, the Income-tax Act and Rules, RBI directions and DICGC coverage before making decisions. TaxGuru accepts no responsibility or liability for incorrect rates, omissions, changes after the review date, financial loss, tax consequences, missed declarations, premature closure, uninsured deposits or any direct or indirect consequences arising from reliance on this material; consult the bank and appropriate qualified advisers for case-specific guidance.

Official Sources Reviewed

• HDFC Bank — Official FD rate schedule effective 19 August 2026 and deposit terms: https://www.hdfc.bank.in/interest-rates
• DICGC — Guide to Deposit Insurance