📋 Executive Summary: What is a Fixed Deposit?
A Fixed Deposit (FD) is a financial instrument provided by scheduled commercial banks, small finance banks, and non-banking financial companies (NBFCs) in India. An investor deposits a lump sum for a predetermined tenure (ranging from 7 days to 10 years) at a fixed, guaranteed interest rate. Unlike market-linked mutual funds, FD interest is guaranteed and protected up to ₹5 Lakh per bank by the DICGC (Deposit Insurance and Credit Guarantee Corporation).
1. How Fixed Deposits Work: Cumulative vs. Non-Cumulative
When opening a Fixed Deposit account, you must select between two distinct interest payment structures:
1. Cumulative Fixed Deposit (Reinvestment Plan)
In a cumulative FD, interest earned every quarter is not paid out into your savings account; it is reinvested back into the principal.
- Compounding Frequency: Indian banks compound cumulative FD interest quarterly ($n = 4$).
- Payout: You receive the original principal plus all accumulated compound interest in a single lump sum upon maturity.
- Best For: Working individuals seeking long-term goal accumulation without requiring immediate cash flows.
2. Non-Cumulative Fixed Deposit (Regular Payout Plan)
In a non-cumulative FD, interest is credited directly into your bank savings account at regular intervals (monthly, quarterly, half-yearly, or annually).
- Compounding: Non-cumulative FDs do not compound, because interest is drained as soon as it accrues.
- Discounting Rule: For monthly payouts, banks apply a discounted interest rate because payments are made prior to the standard quarter end.
- Best For: Senior citizens or retirees seeking a predictable income stream for living expenses.
2. The Mathematical Formula for Cumulative Bank FDs
Because Indian banks compound interest on a quarterly basis, the terminal maturity value of a cumulative Fixed Deposit is calculated using:
$$A = P \times \left(1 + \frac{r}{4}\right)^{4 \times t}$$
Where:
- A = Total maturity payout at the end of the tenure.
- P = Initial principal deposit amount.
- r = Annual interest rate (in decimal, e.g., $7.25\% = 0.0725$).
- t = Total tenure in years (e.g., 3 years, 5 years, or fractional years like 18 months $= 1.5$).
The Effective Annual Yield (EAY)
Because interest compounds quarterly, the Effective Annual Yield is always higher than the stated nominal interest rate: $$\text{EAY} = \left(1 + \frac{r}{4}\right)^4 - 1$$ For example, a nominal interest rate of 7.50% p.a. produces an Effective Annual Yield of 7.71% p.a.!
3. Fixed Deposit Maturity Schedule: ₹10 Lakh Deposit at 7.5%
The following table demonstrates how a one-time ₹10,00,000 deposit compounds across various standard bank deposit tenures at 7.50% p.a. (quarterly compounding):
| Deposit Tenure | Total Principal Invested | Total Compound Interest Earned | Terminal Maturity Value | Effective Yield |
|---|---|---|---|---|
| 1 Year | ₹10,00,000 | ₹77,136 | ₹10,77,136 | 7.71% |
| 2 Years | ₹10,00,000 | ₹1,60,224 | ₹11,60,224 | 8.01% |
| 3 Years | ₹10,00,000 | ₹2,49,723 | ₹12,49,723 | 8.32% |
| 5 Years (Tax Saver) | ₹10,00,000 | ₹4,49,948 | ₹14,49,948 | 9.00% |
| 10 Years | ₹10,00,000 | ₹11,02,349 | ₹21,02,349 (~₹21.0 Lakh) | 11.02% |
Interactive Simulation: Model custom deposit sizes, tenures, and senior citizen rates on our Free FD Calculator.
4. Taxation of Fixed Deposits in India (Section 194A TDS Rules)
Unlike equity mutual funds which enjoy preferential 12.5% LTCG tax rates, Fixed Deposit interest is 100% taxable as ordinary income:
1. Slab Rate Taxation
All interest earned on a Fixed Deposit is added to your gross total income under the head "Income from Other Sources" and taxed at your applicable marginal income tax slab rate (5%, 10%, 15%, 20%, or 30%, plus cess and surcharge).
2. Tax Deducted at Source (TDS) Limits
Under Section 194A, banks automatically deduct 10% TDS on accrued interest if total interest across all branches of that bank exceeds:
- ₹40,000 per financial year for general citizens under age 60.
- ₹50,000 per financial year for senior citizens (age 60 and above).
- If PAN is not provided, the bank is legally required to deduct TDS at 20%.
3. Avoiding TDS: Form 15G and Form 15H
If your total annual taxable income is below the basic tax exemption threshold (e.g., ₹3,00,000 in the Old Regime or ₹7,00,000 in the New Regime), you can submit:
- Form 15G: For resident individuals below 60 years of age.
- Form 15H: For senior citizens aged 60 and above. Submitting these forms at the beginning of each financial year prevents banks from deducting TDS on your interest payouts.
5. Fixed Deposit vs. Mutual Fund SWP for Retirees
Many Indian retirees park their entire retirement savings in Bank FDs. While capital safety is guaranteed, the post-tax, post-inflation return is frequently negative:
- Suppose a senior citizen in the 30% tax bracket holds ₹1 Crore in an FD yielding 7.5%.
- Gross Annual Interest: ₹7,50,000.
- Income Tax at 30% (plus 4% cess): ₹2,34,000.
- Net Post-Tax Cash Flow: ₹5,16,000 (Net Yield: 5.16%).
- At 6.0% CPI inflation, the senior citizen's real net return is -0.84% per annum! The purchasing power of the capital is shrinking every year.
By transitioning a portion of the corpus to a Systematic Withdrawal Plan (SWP) in a Conservative Hybrid Fund, retirees can generate 8.5% returns while paying an effective tax rate of just 3%–5% through capital redemption rules. Compare this on our SWP Calculator.
6. Frequently Asked Questions on Fixed Deposits
Is my money 100% safe in an Indian bank Fixed Deposit?
Under the DICGC (Deposit Insurance and Credit Guarantee Corporation)—a wholly-owned subsidiary of the Reserve Bank of India (RBI)—each depositor in a commercial bank is insured up to a maximum of ₹5,00,000 (Five Lakh Rupees) for both principal and interest across all accounts held in that same right and capacity within that bank.
What is a 5-Year Tax-Saving Fixed Deposit?
A 5-year tax-saving FD qualifies for deduction under Section 80C of the Income Tax Act (up to ₹1.5 Lakh/year under the Old Tax Regime). However, it carries a mandatory 5-year lock-in period with zero premature withdrawal or loan facilities. The interest earned remains fully taxable.
What penalty is charged for premature withdrawal of an FD?
Most commercial banks levy a premature withdrawal penalty of 0.50% to 1.00% on the applicable interest rate for the period the deposit was actually held.