FD and PPF Maturity Explained
Published July 17, 2026By Samson PG
FD maturity depends on rate, tenure, and compounding frequency. PPF follows its own annual contribution and rate rules — model both carefully.
A fixed deposit (FD) locks a sum (or recurring deposits) at a stated rate for a tenure. PPF (Public Provident Fund) is a long-horizon scheme with annual contribution limits and government-set rates. Calculators estimate maturity using compounding assumptions — not a promise from any bank.
Illustrative only — not investment, tax, or product advice. Rates, TDS, and scheme rules change.
FD maturity intuition
Compound interest form (simplified):
A = P × (1 + r/n)^(n×t)- P principal, r annual rate (decimal), n compounds per year, t years
Quarterly compounding (common in banks) means n = 4. A higher n slightly raises effective yield for the same nominal rate.
| Lever | Effect on maturity |
|---|---|
| Rate | Strong |
| Tenure | More periods |
| Compounding frequency | Modest vs rate/tenure |
| Premature withdrawal | Penalties / lower rate |
PPF vs FD (high level)
| Feature | FD | PPF |
|---|---|---|
| Tenure flexibility | Short to medium common | Long lock-in style framework |
| Rate source | Bank / issuer | Scheme rate (as notified) |
| Contributions | Often lump or RD-style | Annual contribution pattern |
| Tax treatment | Rules vary | Scheme-specific |
Use TryCalculatingNow FD Calculator for deposit maturity scenarios and TryCalculatingNow PPF Calculator when modeling PPF-style contribution paths.
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FAQ
Is FD interest the same as APR on a loan?
Related compounding math; products and fees differ.
Why does my bank certificate differ from a calculator?
Day-count, payout vs reinvestment, senior-citizen rates, and TDS handling.
Can I compare FD and PPF with one rate?
Only as a rough scenario — constraints and tax treatment are not identical.
What about recurring deposits?
RD is a contribution stream — closer to SIP/annuity intuition than a single lump FD.