FINBIZTOOLS
PPF Explained: Reading a Projection
Applicable financial year: conceptual guide; no year-specific rates or tax eligibility asserted. Reviewed: 2026-10-28. Last updated: 2026-10-28. Check current official rules before applying this guidance.
Understanding the method
The calculator lets you enter annual contribution, duration, opening balance, an illustrative rate and deposit-timing assumption. Earlier qualifying deposits and later deposits can earn different interest. A projection with an opening balance includes existing money; do not confuse that balance with new contributions. Verify eligibility, contribution limits, account maturity and extension rules from the official scheme before acting.
Worked example
With ₹10,000 of new contributions per year for two years and an illustrative 0% rate, new contributions total ₹20,000. An opening balance of ₹5,000 makes the ending value ₹25,000. This arithmetic illustration does not imply that a two-year PPF account is freely withdrawable.
Formula and definitions
Projected closing balance = opening balance + contributions + modeled interest. The annual ledger applies the selected timing assumption.
How to use FinBizTools
- Read the current scheme and rate notification before using any displayed default.
- Enter existing balance separately from new annual contributions.
- Compare the available contribution-timing options.
- Read interest, contributions and final balance separately; check withdrawal rules outside this model.
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Common mistakes and limitations
No current rate or tax benefit is asserted here. The tool’s default rate is labeled illustrative and requires verification. Financial-year tax treatment and account rules must be reviewed before publication of any specific eligibility claim.
Scheme features to confirm before projecting
A PPF projection is only as good as its inputs, so confirm these points against the current scheme rules and your account passbook before relying on any number:
- Contribution range. The calculator accepts ₹500 to ₹1,50,000 per financial year, in multiples of ₹50, reflecting the limits in the scheme rules at the time of writing.
- Interest rate. The rate is notified by the government for each quarter and can change. The calculator’s 7.1% default is an illustration, not a forecast.
- Maturity. The account matures 15 years from the end of the financial year in which it was opened, and the rules have allowed extension in blocks of five years. The projection-years field does not decide legal maturity for you.
- Withdrawals and loans. Partial withdrawals and loans are restricted to specific years and amounts. The calculator does not model them.
- Tax treatment. Check the current income-tax rules and your chosen tax regime; this guide does not assert any deduction or exemption.
Worked example: the effect of deposit timing
PPF interest is calculated on the lowest balance between the fifth day and the end of each month, and credited once a year. The calculator models this with a deposit-timing choice. Using an illustrative constant rate of 7.1% and the maximum ₹1,50,000 contribution every year for 15 years:
| Deposit timing | Total contributions | Estimated interest | Projected value |
|---|---|---|---|
| On or before 5 April each year | ₹22,50,000 | ₹18,18,209 | ₹40,68,209 |
| In March each year | ₹22,50,000 | ₹15,70,989 | ₹38,20,989 |
The same money produces about ₹2,47,000 more in the illustration simply because it is deposited at the start of each financial year instead of the end, giving it eleven extra months of interest every year. In the first year of the April scenario, interest is ₹10,650 on ₹1,50,000 (7.1% for the full year); in the March scenario, the year’s deposit earns only one month’s interest.
Reading the year-by-year ledger
The PPF Calculator shows a financial-year table with the contribution, that year’s interest, cumulative contributions and the closing balance. Look at how the interest column grows: by year 15 of the April example, the year’s interest alone is about ₹2,69,700, more than the year’s deposit. That is compounding at work, and it is why the later years contribute most of the final value. If you are part-way through an account, enter your current balance as the opening balance and only future deposits as contributions, so existing money is not counted twice.
Lump-sum versus monthly deposits
You can deposit in one instalment or several during a year. Because interest is based on the monthly minimum balance after the fifth, money deposited earlier in the year earns more. If an annual lump sum is not practical, depositing a fixed amount before the fifth of each month is the next best pattern. The calculator models a single annual deposit, so treat monthly patterns as falling somewhere between its April and March results.
Common mistakes with PPF projections
- Assuming today’s rate will apply for 15 years.
- Entering the existing balance as a new contribution.
- Depositing after the fifth of the month and expecting interest for that month.
- Forgetting that money is locked in and may not be available for short-term goals.
- Comparing PPF with market-linked products on return alone, without considering risk and liquidity.
To see what the projected amount may be worth in today’s money, run the result through the Inflation Calculator. To plan the yearly deposit within your household budget, use the Monthly Budget Planner.
Frequently asked questions
Is the maturity estimate guaranteed?
No. It holds assumptions constant and cannot establish future notified rates or your actual eligibility.
Sources to review
The official scheme reference below requires verification before publication: it could not be retrieved during preparation on 16 September 2026. No current rate or entitlement is asserted here.
Disclaimer
This guide is educational. Examples are illustrative, not financial, tax or legal advice. Verify important decisions and current requirements. Read the FinBizTools Disclaimer.