ToolMint
Calculators5 min readMay 15, 2026

Compound Interest vs Fixed Deposit in India โ€“ Which Grows Your Money Faster?

Most people in India have used a fixed deposit (FD) at some point. It is safe, predictable, and guaranteed by the bank up to โ‚น5 lakh. But the return on FDs has consistently trailed inflation and other savings instruments over long periods. Understanding how compound interest works across different vehicles โ€” FD, PPF, mutual funds โ€” helps you make better decisions about where to put money that you do not need immediately.

How Compound Interest Works

With compound interest, interest earned in each period is added to the principal, and future interest is calculated on the new (larger) total. This creates exponential growth over time. Formula: A = P ร— (1 + r/n)^(nt) Where P = principal, r = annual rate, n = compounding frequency per year, t = years โ‚น1,00,000 at 7% annual interest: โ€ข Simple interest (10 years): โ‚น1,70,000 โ€ข Compounded annually (10 years): โ‚น1,96,715 โ€ข Compounded quarterly (10 years): โ‚น2,00,160 โ€ข Compounded monthly (10 years): โ‚น2,00,966 Quarterly compounding beats annual by โ‚น3,445 on โ‚น1 lakh over 10 years โ€” a meaningful difference at scale.

FD Interest Rates and Compounding in India

Most Indian bank FDs compound quarterly. The headline rate is the annual rate, but the effective yield (because of quarterly compounding) is slightly higher. For example, an FD at 7% compounded quarterly has an effective annual yield of 7.19%. Current FD rates (2025โ€“26) range from 6.5% to 8% depending on tenure and bank. Small finance banks like Unity, Suryoday, and Jana offer 8โ€“9% on certain tenures but carry higher risk. Senior citizens typically receive 0.25โ€“0.50% extra on FDs. For FDs, the interest is taxable as income in the year it accrues โ€” this reduces the effective post-tax return significantly for those in the 30% bracket.

PPF vs FD: Which Is Better?

PPF (Public Provident Fund) currently offers 7.1% annual interest, compounded annually, with a 15-year lock-in. The key advantage is full tax exemption: contributions qualify for Section 80C deduction, interest earned is tax-free, and the maturity amount is tax-free (EEE status). FD returns are fully taxable. If you are in the 30% tax bracket, a 7.5% FD effectively yields 5.25% after tax โ€” lower than PPF at 7.1% tax-free. For long-term savings, PPF almost always wins on post-tax returns unless you need liquidity. The main drawback of PPF is the 15-year lock-in and the annual contribution limit of โ‚น1.5 lakh.

The Rule of 72: How to Quickly Estimate Doubling Time

The Rule of 72 gives a quick estimate of how long it takes money to double: Years to double โ‰ˆ 72 รท interest rate โ€ข FD at 7%: 72 รท 7 = ~10.3 years to double โ€ข PPF at 7.1%: 72 รท 7.1 = ~10.1 years to double โ€ข Equity mutual fund at 12% CAGR (historical average): 72 รท 12 = 6 years to double โ€ข Inflation at 5โ€“6%: 72 รท 5.5 = ~13 years to halve purchasing power This rule shows why matching inflation is not enough โ€” you need returns above inflation to actually grow wealth in real terms.

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Frequently Asked Questions

Is FD better than mutual funds for long-term savings in India?
For short-term (under 3 years), FDs provide better guaranteed returns. For long-term (7+ years), diversified equity mutual funds have historically returned 10โ€“14% CAGR, significantly outperforming FDs at 6.5โ€“8%. However, mutual funds carry market risk while FDs are capital-protected.
What is the best compounding frequency for maximum returns?
More frequent compounding yields higher effective returns. Monthly compounding beats quarterly, which beats annual. However, most FDs in India compound quarterly โ€” the difference between quarterly and monthly on typical amounts is small (a few hundred rupees per lakh over 5 years).
How does inflation affect FD returns?
If inflation is 5.5% and your FD earns 7%, the real return is approximately 1.5%. After tax (30% bracket), the post-tax return is around 4.9% โ€” below inflation. In real terms, your purchasing power actually decreases. This is why FDs are better for capital preservation than wealth creation over long periods.

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