How to use this PPF calculator
- Enter your yearly deposit, between ₹500 and ₹1.5 lakh.
- Check the PPF interest rate. It starts at 7.1%, the rate for October–December 2026.
- Set the years: 15 for a new account, or 20, 25 and so on if you plan to extend.
- Choose when you deposit: by 5 April, monthly by the 5th, or in March.
- Open "More options" to add your current balance, or to stop deposits after year 15 on an extended account.
How PPF interest works
The Public Provident Fund is a government savings scheme. Interest is worked out every month on the lowest balance between the 5th and the end of the month, then credited once a year on 31 March, when it starts earning interest itself. A deposit made by the 5th earns for that month; a deposit on the 6th or later doesn't start earning until the next month.
M = D × ((1 + r)n − 1) ÷ r × (1 + r) For a deposit D made by 5 April every year: r is the yearly rate as a decimal and n the number of years. The calculator works year by year, so it also handles monthly and late deposits.
Worked example
You put the maximum ₹1.5 lakh into PPF by 5 April every year for 15 years at 7.1%. You deposit ₹22,50,000, and the account matures at ₹40,68,209. The ₹18,18,209 of interest is tax-free, and interest makes up 45% of the final amount.
When you deposit makes a difference
| ₹1.5 lakh a year, 15 years at 7.1% | Maturity value |
|---|---|
| Deposited by 5 April each year | ₹40,68,209 |
| ₹12,500 a month, by the 5th | ₹39,44,599 |
| Deposited in March, after the 5th | ₹37,98,515 |
The same money earns about ₹2.7 lakh more when it goes in at the start of the financial year rather than the end. If you can't manage a lump sum in April, monthly deposits before the 5th get you most of the benefit.
PPF maturity by deposit and tenure
At 7.1%, deposited by 5 April each year:
| Yearly deposit | 15 years | 20 years | 25 years |
|---|---|---|---|
| ₹50,000 | ₹13,56,070 | ₹22,19,429 | ₹34,36,005 |
| ₹1,00,000 | ₹27,12,139 | ₹44,38,859 | ₹68,72,010 |
| ₹1,50,000 | ₹40,68,209 | ₹66,58,288 | ₹1,03,08,015 |
Extending your PPF account
A PPF account matures after 15 financial years. You can then extend it in blocks of 5 years, as often as you like, with or without new deposits. Keeping the maximum going for 25 years takes ₹1.5 lakh a year to about ₹1.03 crore. Stopping deposits after year 15 but leaving the money in for another 10 years still grows it to about ₹80,77,891. The scheme also allows loans and partial withdrawals under its own conditions; check the rules with your bank or post office.
Rate changes and tax
The PPF rate is set by the government and reviewed every quarter. It is 7.1% for October–December 2026; the calculator assumes it stays there for every year, so treat long projections as estimates and change the rate to test other cases. PPF interest and the maturity amount are tax-free, and under the old tax regime your deposits count towards the ₹1.5 lakh yearly deduction limit. Compare regimes with the income tax calculator, or see what a market-linked SIP or a bank FD might earn instead.
Frequently asked questions
What is the current PPF interest rate?
What will ₹1.5 lakh a year in PPF be worth after 15 years?
Why should I deposit in PPF before 5 April?
Is PPF interest tax-free?
Can I extend my PPF account after 15 years?
What will ₹1,000 a month in PPF be worth?
Sources and further reading
Independent, official guidance on this topic. Rules differ by country, so check the regulator where you live.
- Public Provident Fund: rules and current interest rate · National Savings Institute, Ministry of Finance
- Post office savings schemes, including PPF and RD · India Post
This calculator gives estimates for education and planning. It is not financial advice, and your lender's figures may differ. See how we calculate.