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Summary: Most PPF investors assume their interest rate is locked in for the full 15-year term; it isn't. This piece explains how the rate actually moves, how interest is calculated month to month and one simple timing habit that can meaningfully affect your returns.
Is the PPF interest rate fixed for the entire 15-year tenure? How is the interest calculated? – Anonymous
No, the PPF (Public Provident Fund) interest rate isn't fixed for the full 15-year tenure. It's reviewed and revised every quarter based on prevailing market conditions, so the rate applicable to your account can change several times over the 15 years. For instance, it has ranged between 8.7 per cent and 7.1 per cent over the last decade; for April-June 2026, it stood at 7.1 per cent.
How to maximise your PPF interest
Interest is calculated monthly but credited only at the end of the financial year. Each month, it's computed on the lowest balance between the 5th and the last day of that month. So to earn interest on a fresh deposit for the full month, make it before the 5th.
For example: say you have Rs 5 lakh in your account on April 1 and deposit Rs 50,000 on April 10. Since the deposit came after the 5th, April's interest is calculated only on Rs 5 lakh, at 7.1 per cent per annum; that's Rs 2,958 (Rs 5,00,000 × 7.1% ÷ 12). Had the same Rs 50,000 been deposited before the 5th, interest for that month would have been calculated on Rs 5.5 lakh instead, a noticeably higher return.
One more thing worth knowing: PPF interest compounds annually, and all interest earned is tax-free.
Also read: No change in small-savings scheme rates for Apr-Jun 2025
This article was originally published on April 01, 2025, and last updated on July 13, 2026.
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