What is a Fixed Deposit?
A fixed deposit (FD) is a type of investment account in which you invest a specific amount of money at a fixed interest rate and for a fixed term. At the end of the agreed period, the investment can either be rolled over (reinvested) or liquidated — returned to you with the interest earned. The financial institution calculates your earned interest cumulatively monthly, quarterly, semi-annually, or annually, depending on how the interest compounds.
Fixed Deposit Rates — How to Calculate Fixed Deposit?
The term for a fixed deposit can vary between 30 days and 10 years, with interest rates typically ranging between 3% and 11%. Although FD interest rates are lower than most investment vehicles, the returns are almost risk-free and much better than a regular savings account. The longer the term and the higher the deposit amount, the more interest accrues.
For example, a ₽100,000 investment at 8% for one year earns ₽8,000 interest. For two years at the same rate with annual compounding, it earns ₽16,640 — more than double the first-year interest, because in year two you also earn interest on the year-one interest.
How to Improve Your FD Returns?
- Roll over principal + interest: Reinvest both the original principal and accrued interest for the same term, compounding your returns.
- Shop for better rates: Compare rates from at least three financial providers. Even a small difference in rate significantly affects the final amount over long terms.
- Choose higher compounding frequency: Monthly compounding gives a higher effective yield than annual compounding at the same nominal rate.
- Select a longer term: Banks typically offer higher interest rates for longer-term deposits.
Types of Fixed Deposit
Cumulative Fixed Deposit
Interest is compounded at the chosen frequency (monthly, quarterly, semi-annually, or annually) and paid out at maturity together with the principal. Most financial institutions require a minimum term of 90 days (3 months) to allow compounding. This type maximizes your returns if you can leave the money untouched until maturity.
Simple Fixed Deposit
Interest is calculated only on the principal amount (no compounding). This is typical for short-term deposits (under 90 days). You can withdraw accrued interest as periodic payouts. The formula is straightforward: M = P × (1 + r × t).
How to Calculate Fixed Deposit Interest — How Does the FD Calculator Work?
Simple Fixed Deposit Formula
The interest earned on a simple fixed deposit is calculated as simple interest:
Maturity Amount (M) = P × (1 + r × t)
Where:
- P = Principal (initial deposit amount)
- r = Annual interest rate (as a decimal, e.g. 0.075 for 7.5%)
- t = Time in years
Cumulative Fixed Deposit Formula
The interest earned on a cumulative fixed deposit is compounded:
Maturity Amount (M) = P × (1 + r/n)n×t
Where:
- P = Principal
- r = Annual interest rate (decimal)
- n = Compounding frequency per year (1 = annual, 2 = semi-annual, 4 = quarterly, 12 = monthly, 365 = daily)
- t = Time in years
Benefits and Limitations of Fixed Deposit
Benefits
- Guaranteed returns: The interest rate is fixed at the time of investment — no market risk.
- Insured: In many countries, deposits are insured by government schemes (e.g., up to $250,000 by the FDIC in the USA, up to ₽1,400,000 by the DIA in Russia).
- Better than savings accounts: FDs typically offer higher interest rates than regular savings accounts.
- Flexible terms: Choose terms from 30 days to 10 years to match your financial goals.
- Predictable income: You know exactly how much you will receive at maturity.
Limitations
- Low liquidity: Early withdrawal usually results in a penalty or forfeiture of some interest.
- Lower returns than equities: FDs are safer but generally provide lower long-term returns than stocks or mutual funds.
- Inflation risk: If inflation exceeds your FD rate, the real value of your money decreases.
- Tax on interest: Interest earned on FDs is typically subject to income tax.
Frequently Asked Questions
- What is the difference between simple and cumulative FD?
- In a simple FD, interest is calculated only on the principal and paid out periodically. In a cumulative FD, interest is reinvested and compounded, giving a higher maturity amount.
- What is the maximum term for a fixed deposit?
- Most banks offer FD terms from 7 days up to 10 years. This calculator supports terms from a few weeks up to 10 years.
- Which currency does the FD calculator support?
- This calculator supports 30 world currencies including USD, RUB (Russian Ruble), EUR, GBP, INR, JPY, and many more.
- What happens if I break my FD early?
- You will typically receive a reduced interest rate (a penalty), or forfeit some of the accrued interest. Always check the premature withdrawal terms with your bank.
- Is FD interest taxable?
- Yes, in most countries interest earned on fixed deposits is included in your taxable income. Consult your local tax authority for details.