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A PPF calculator does something no spreadsheet shortcut can: it projects the exact maturity value of your Public Provident Fund account by treating every year as a separate compounding cycle rather than a flat division. Enter your annual contribution, set the tenure, and the tool returns a breakdown of principal, interest, and the final corpus — all calculated at the current 7.1% rate, compounded annually. Whether you are comparing contribution levels, checking whether you will hit a target corpus, or simply trying to understand what your 15-year commitment will produce, the calculator removes guesswork from a scheme where deposits before the 5th of the month change everything.
A PPF calculator is not a generic compound interest tool with a PPF label pasted on. It models the specific mechanics of the Public Provident Fund scheme: a fixed annual contribution, annual compounding, and a 15-year lock-in that can be extended in five-year blocks. The output is a year-by-year table showing how your balance grows, along with the total interest earned and the maturity value.
The distinction from a standard compound interest calculator matters because PPF contributions are capped at ₹1.5 lakh per year, and the interest calculation method — lowest balance between the 5th and last day of each month — creates a timing advantage for early deposits. A PPF calculator that ignores this monthly rule will overstate or understate your returns depending on when you actually deposit.
Most calculators let you adjust three variables: the annual deposit amount, the tenure (typically 15 to 50 years), and the interest rate. The rate is pre-filled at 7.1%, but since the government reviews it every quarter, you can change it to model a rate change — or leave it constant for a conservative estimate.
The PPF interest rate is not set by banks. It is notified quarterly by the Ministry of Finance, based on a formula recommended by the Shyamala Gopinath Committee. That formula pegs the PPF rate at 25 basis points above the average yield of 10-year government securities from the previous quarter. In practice, the government has kept the rate at 7.1% per annum since April 2020 — one of the longest periods without revision in the scheme's history.
Here is the rate history for the past few years:
| Period | PPF Interest Rate |
|---|---|
| April 2020 to present (September 2026) | 7.1% |
| July 2019 to March 2020 | 7.9% |
| October 2018 to June 2019 | 8.0% |
| April 2017 to September 2018 | 7.8% |
| April 2016 to March 2017 | 8.1% |
What the table shows is a gradual decline from above 8% to the current 7.1%. The rate has not moved for over six years, which gives long-term planners a stable assumption to work with. But it is not guaranteed. The Shyamala Gopinath formula currently suggests a slightly higher rate — around 7.5% — but the government has chosen to keep it lower, citing the tax-free status of PPF returns as compensation for the gap.
The interest calculation method is where PPF differs from a fixed deposit. Interest is not credited monthly or quarterly. It is calculated every month but credited only once a year, on 31 March. The monthly calculation uses the lowest balance in your account between the 5th day and the last day of that month.
This creates a simple but powerful timing rule: deposit before the 5th of any month, and your money earns interest for that entire month. Deposit on the 6th or later, and you lose that month's interest on the fresh amount. Over 15 years, the difference between depositing on the 1st of April versus the 10th of April can run into several thousand rupees.
The formula a PPF calculator uses to estimate maturity, assuming a constant annual deposit, is:
Where P is the annual deposit, i is the annual interest rate as a decimal, and n is the number of years. For a deposit of ₹1.5 lakh per year for 15 years at 7.1%, this gives an approximate maturity of ₹40.68 lakh. A more precise calculator models the monthly interest calculation and the annual compounding, but for most planning purposes, the simplified formula is close enough.
PPF allows contributions from ₹500 to ₹1.5 lakh in a financial year. You can deposit the entire amount in a lump sum, or spread it across monthly instalments. The choice affects your returns because of the 5th-of-the-month rule.
Depositing ₹12,500 every month before the 5th is not mathematically identical to depositing ₹1.5 lakh on 1 April. The lump-sum approach earns interest on the full amount from the first month. The monthly approach earns interest on each instalment only from the month it is deposited. Over 15 years, the lump-sum method typically produces a higher maturity value.
But monthly deposits have a practical advantage: they force discipline. If a lump sum at the start of the year is difficult to arrange, a PPF calculator with monthly investment option can show you exactly how much you lose by spreading contributions — and whether that loss is worth the convenience.
PPF enjoys Exempt-Exempt-Exempt (EEE) status, which is the most favourable tax treatment available to any Indian savings instrument. The three exemptions work like this: the amount you deposit is deductible under Section 80C, the interest earned is tax-free, and the maturity proceeds are entirely exempt from tax.
The Section 80C deduction is capped at ₹1.5 lakh per financial year. If you deposit the maximum ₹1.5 lakh, you can reduce your taxable income by that amount — but only under the old tax regime. The new tax regime, which has been the default since April 2023, does not allow Section 80C deductions. If you have opted for the new regime, PPF's tax advantage is limited to the tax-free interest and maturity, not the upfront deduction.
For taxpayers in the 30% bracket who still use the old regime, the effective return on PPF is higher than the nominal 7.1%. The Section 80C deduction reduces the taxable income, and the tax-free interest compounds the benefit. A income tax calculator can help you compare the two regimes side by side.
PPF is designed as a long-term commitment, and the withdrawal rules reflect that. The account has a 15-year lock-in period, calculated from the end of the financial year in which it was opened. You cannot touch the money during this period except through two channels: partial withdrawals and loans.
Partial withdrawals are permitted from the 7th financial year onward. The maximum you can withdraw in a year is 50% of the balance at the end of the 4th financial year preceding the withdrawal, or 50% of the balance at the end of the immediately preceding financial year — whichever is lower. Only one withdrawal is allowed per financial year, and any outstanding loan must be cleared before you can withdraw.
Premature closure is a separate matter. It is allowed only after completing five financial years and only under three specific circumstances: treatment of a life-threatening illness for you or a dependent family member, higher education expenses for you or a dependent child, or a change in residency status. Even then, the interest earned is recalculated at 1% lower than the applicable rate for the entire period. That penalty reduces your effective return, which is why premature closure should be treated as a last resort.
If you need funds before 15 years, explore the loan facility before considering closure. A loan calculator can help you compare the cost of borrowing against the penalty of premature withdrawal.
Between the 3rd and 6th financial year of your PPF account, you can take a loan against your balance. The loan amount is capped at 25% of the balance at the end of the second financial year immediately preceding the year in which the loan is applied for. The interest rate on the loan is 2% higher than the prevailing PPF rate — currently 9.1% — and the repayment window is 36 months.
This facility is useful for temporary cash-flow needs, but it comes with a catch: if you fail to repay within 36 months, the outstanding amount is deducted from your PPF balance, which reduces your compounding base. Only one loan can be taken at a time, and a second loan is not permitted until the first is fully repaid.
When your PPF account completes 15 years, you have three options. The first is to withdraw the entire balance and close the account. The second is to extend the account in blocks of five years with fresh contributions. The third is to extend it without making any further deposits, letting the existing balance continue to earn interest.
If you want to keep contributing after maturity, you must submit the prescribed extension form within one year of the maturity date. If you miss that window, the account is automatically extended for five years, but fresh deposits are not allowed — only the existing balance earns interest. This is a common oversight, and it can cost you the opportunity to keep building your corpus.
During an extension with deposits, the same ₹500 to ₹1.5 lakh annual contribution limits apply. Partial withdrawals are allowed, but total withdrawals during each five-year block cannot exceed 60% of the balance at the beginning of that block.
PPF competes with ELSS, NPS, and fixed deposits for the tax-saving rupee. The comparison hinges on three factors: returns, lock-in, and taxation.
ELSS has a shorter lock-in of three years and the potential for higher market-linked returns, but gains above ₹1.25 lakh are taxed at 12.5% (long-term capital gains). NPS offers an additional ₹50,000 deduction under Section 80CCD(1B), but 40% of the corpus must be annuitised at retirement, and the annuity income is taxable. PPF offers the lowest nominal return of the three, but it is guaranteed, fully tax-free, and government-backed.
For investors who prioritise certainty and tax efficiency over upside, PPF remains the benchmark. For those with a higher risk appetite and a shorter horizon, ELSS may be more suitable. A PPF calculator and an SIP calculator can help you compare the two side by side with your actual contribution amounts.
The PPF interest rate for the July-September 2026 quarter is 7.1% per annum, compounded annually. The rate is reviewed every quarter by the Ministry of Finance and has remained unchanged since April 2020.
Interest is calculated each month on the lowest balance between the 5th and the last day of that month. It is compounded annually and credited to your account on 31 March. Deposits made before the 5th of any month earn interest for that full month.
You can deposit a minimum of ₹500 and a maximum of ₹1.5 lakh in a financial year. Contributions above ₹1.5 lakh do not earn interest and are not eligible for tax deduction under Section 80C.
Partial withdrawals are permitted from the 7th financial year onward, subject to a cap of 50% of the balance at the end of the 4th financial year or the previous financial year, whichever is lower. Only one withdrawal is allowed per financial year.
Premature closure is allowed only after completing five financial years and only under specific circumstances: life-threatening illness, higher education, or a change in residency status. The interest earned is recalculated at 1% lower than the applicable rate.
You can withdraw the full amount and close the account, extend it in blocks of 5 years with fresh contributions, or continue without deposits and let the balance earn interest. To extend with contributions, you must submit the required form within one year of maturity.
PPF offers guaranteed, tax-free returns with a 15-year lock-in, making it suitable for conservative investors. ELSS has a shorter lock-in of 3 years but returns are market-linked and gains above ₹1.25 lakh are taxable. The right choice depends on your risk appetite and time horizon.
No. An individual can open only one PPF account in their own name. However, you can open a separate account for a minor child. If you have two accounts in your name, the second account will not earn interest, and the balance may be refunded without interest.
In the end, a PPF calculator is a planning instrument, not a prediction. It takes the rules — the 7.1% rate, the 15-year lock-in, the monthly interest calculation, the Section 80C ceiling — and turns them into a number you can work with. The number will change if the government revises the rate, and it will shift if you adjust your deposit timing. But the structure of the scheme is stable, and that stability is precisely what makes PPF useful for long-term goals. Use the PPF maturity calculator above, set your contribution to a level you can sustain for 15 years, and treat the output as a conservative baseline rather than a ceiling. The compounding does the rest.