Fixed Deposit (FD) Maturity Calculation Guide

How FD interest compounds, the difference between cumulative and non-cumulative FDs, and how to calculate maturity value.

Fixed Deposits (FDs) remain one of the most popular savings instruments in India because the returns are guaranteed and predictable — but the actual maturity amount depends heavily on how often interest is compounded, a detail many depositors overlook when comparing bank offers.

The FD Maturity Formula

Most Indian banks compound FD interest quarterly. The formula is:

A = P × (1 + r/n)n×t

Where:

  • A = Maturity amount
  • P = Principal (initial deposit)
  • r = Annual interest rate (as a decimal)
  • n = Number of times interest compounds per year (usually 4 for quarterly)
  • t = Tenure in years

A Real Example

Deposit ₹5,00,000 in an FD at 7% annual interest, compounded quarterly, for 5 years.

  • r/n = 0.07 / 4 = 0.0175
  • n×t = 4 × 5 = 20 compounding periods
  • A = 5,00,000 × (1.0175)20 ≈ ₹7,09,940
  • Total interest earned ≈ ₹2,09,940

Cumulative vs Non-Cumulative FDs

Banks typically offer two FD types, and the difference significantly affects your total return:

  • Cumulative FD — interest is reinvested and compounds until maturity, paid out as one lump sum at the end. This gives the highest total return because of compounding.
  • Non-cumulative FD — interest is paid out to you monthly, quarterly, or annually as income, rather than reinvested. Useful if you need regular income, but the total amount earned over the tenure is lower since there is no compounding on the paid-out interest.

Why Compounding Frequency Matters

Two FDs with the identical quoted interest rate can produce different maturity amounts if one compounds quarterly and another compounds annually — more frequent compounding always produces a slightly higher return for the same nominal rate. This is a detail worth checking when comparing FD offers across banks, especially for large deposits or long tenures where the difference becomes more noticeable.

Tax on FD Interest

FD interest is fully taxable as per your income tax slab, and banks deduct TDS (Tax Deducted at Source) if the interest earned crosses the threshold set by the Income Tax Department in a financial year. It is worth factoring this into your real, post-tax return expectations rather than just looking at the quoted interest rate.

Calculate FD Maturity Instantly

Rather than working through the compound interest formula by hand, use our free FD Calculator — enter your deposit amount, interest rate and tenure to instantly see your maturity value and total interest earned.

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Frequently Asked Questions

How often does FD interest usually compound in India? add
Most Indian banks compound FD interest quarterly, though some offer monthly or annual compounding — always check the specific bank's compounding frequency, since it affects your final maturity amount.
Is FD interest taxable? add
Yes, FD interest is fully taxable according to your income tax slab, and banks deduct TDS if your total interest income crosses the prescribed threshold in a financial year.
What happens if I break an FD before maturity? add
Most banks allow premature withdrawal but apply a penalty, typically 0.5%–1% lower interest rate than the original rate, and the reduced rate applies to the entire deposit period, not just the remaining time.