Complete Guide to Fixed Deposit (FD) Calculations & Interest Rates 2026
A Fixed Deposit (FD) remains one of India's most trusted savings instruments. By depositing a lump-sum amount with a commercial bank, non-banking financial company (NBFC), or India Post for a fixed tenure at an agreed interest rate, investors guarantee guaranteed capital preservation and fixed returns.
1. How Fixed Deposit Compounding Works in India
Unlike simple interest savings accounts, most fixed deposits in India use Quarterly Compounding for cumulative schemes. This means interest is calculated every 3 months and added to the principal, so subsequent interest accumulates on the newly increased balance.
Compound Interest Mathematical Formula:
A = P × (1 + r / n)^(n × t)
- A: Maturity Amount
- P: Initial Principal Invested
- r: Annual Nominal Interest Rate (in decimal form)
- n: Compounding Frequency per year (n = 4 for Quarterly)
- t: Total Tenure in Years (e.g., 2 Years 6 Months = 2.5 Years)
2. Cumulative vs Non-Cumulative Fixed Deposits
- Cumulative FD: Interest is reinvested and paid along with the principal at maturity. This yields the highest total returns because of compounding.
- Non-Cumulative FD: Interest is paid out regularly (monthly, quarterly, or annually) into your bank account. Ideal for retirees and pensioners who need regular monthly cash flow.
3. Senior Citizen FD Benefits
Most Indian public and private sector banks (including SBI, HDFC Bank, ICICI Bank, and Bank of Baroda) offer an additional 0.50% to 0.75% per annum interest rate for senior citizens (individuals aged 60 and above). Special tenure buckets often provide up to 8.25% p.a.
Frequently Asked Questions (FAQ)
What is TDS on Fixed Deposit interest?
Under Indian Income Tax regulations, banks deduct Tax Deducted at Source (TDS) at 10% if your cumulative interest income exceeds ₹40,000 in a financial year (or ₹50,000 for senior citizens). If your total income is below the taxable threshold, submit Form 15G or 15H to prevent TDS deductions.
Can I break my FD before maturity?
Yes. Premature withdrawal is permitted for most retail deposits, although banks usually levy a penalty of 0.50% to 1.00% on the applicable interest rate for the period the deposit remained with the bank.
What is the DICGC insurance limit on bank deposits?
Under the Deposit Insurance and Credit Guarantee Corporation (DICGC), cumulative deposits across savings, current, and fixed deposits are insured up to ₹5,00,000 per depositor per bank in case of bank liquidation.