Public Provident Fund is the only savings instrument in India that offers a government-backed guarantee, Section 80C tax deduction on your investment, and completely tax-free interest and maturity amount — all three benefits together in a single product. For a salaried investor who pays income tax, no other comparable fixed-return instrument matches this triple tax advantage. Yet most PPF account holders have never sat down to calculate exactly what they will receive at the end of 15 years — and many are genuinely surprised when they do.
The PPF Calculator on AllInOneTools makes this calculation instant and precise. Enter your yearly investment amount, the current PPF interest rate, your tenure, and investment mode, and the tool immediately shows your total invested amount, total tax-free interest earned, maturity amount, and net return on investment — along with a full year-by-year growth schedule and downloadable reports.
This article covers exactly how PPF compounding works, the annuity formula the calculator uses, a complete worked example using the actual numbers from the tool, the key PPF rules every investor should know, how PPF compares with FD for different investor profiles, and answers to the most commonly searched PPF questions in India.
What This PPF Calculator Does
This calculator models the exact way PPF interest accumulates — using the annual annuity formula that the government applies — and gives you a complete picture of your wealth growth across the full 15-year tenure, not just the final maturity figure.
What you enter:
- Yearly Investment — the amount you plan to invest each year (maximum ₹1,50,000 as per current rules)
- Interest Rate (p.a.) — the current PPF interest rate (7.1% as of July 2026)
- Tenure (Years) — minimum 15 years, extendable in 5-year blocks
- Investment Mode — Yearly Lump Sum (single annual deposit) or Monthly (spreading deposits across the year)
What you get:
- Total Amount Invested across the full tenure
- Total Interest Earned — the complete tax-free return
- Maturity Amount (Tax-Free) — your final corpus
- Net Return on Investment percentage
- Wealth Breakdown doughnut chart — Total Invested vs. Total Interest
- The exact Annuity Formula used, displayed for transparency
- Year-by-Year Growth Schedule — Opening Balance, Yearly Deposit, Interest Earned, and Closing Balance for every single year
- Download as TXT and Download as CSV options
Best for: Salaried employees planning their Section 80C tax-saving investments, parents starting a PPF account for a child's future, anyone comparing PPF against FD or ELSS for long-term wealth creation, retirees considering PPF extension after maturity, and anyone who wants to see exactly how their annual PPF contribution compounds year by year over 15 years.
How the Formula Works
PPF does not use simple interest, nor does it use the standard monthly compounding formula that banks apply to savings accounts. PPF uses an annual annuity formula — specifically a future value of annuity due calculation — which means interest is calculated on the balance at the end of each financial year and credited annually. This is what the calculator applies.
What each variable means:
- M — Maturity Amount — the total tax-free corpus you receive
- P — Yearly Investment Amount (e.g., ₹1,50,000)
- i — Annual Interest Rate as a decimal (7.1% = 0.071)
- n — Number of Years (minimum 15)
The (1 + i) multiplier at the end of the formula is what makes this an "annuity due" calculation — it accounts for deposits being made at the beginning of each period rather than the end, which slightly increases the final maturity amount compared to a standard end-of-period annuity calculation. For PPF, the government effectively credits interest on contributions made before the 5th of each month, which is why experienced PPF investors deposit before the 5th of April each year to maximise interest for that financial year.
In plain terms: every year you deposit your PPF contribution, it earns interest for the full year. The following year, both your original deposit and the interest from the previous year earn interest together. This compounding continues for 15 years, which is why the interest earned in Year 15 (₹2,69,694 on a ₹1.5 lakh annual investment at 7.1%) is dramatically larger than the interest earned in Year 1 (₹10,650) — that is what this calculator applies.
Understanding PPF Rules Every Investor Should Know
Minimum tenure is 15 years: A PPF account cannot be closed before 15 years from the end of the financial year in which the account was opened. If you open an account in November 2026, the earliest you can fully close it is April 2042 (15 years from the end of FY 2026-27). The calculator enforces this minimum in its Tenure field.
Maximum investment per year is ₹1,50,000: This is the hard annual limit set by the government. You can invest in up to 12 instalments in a financial year, but the total across all deposits must not exceed ₹1.5 lakh. Deposits above this limit are neither eligible for tax deduction nor do they earn any interest — they simply stay idle in the account.
Minimum annual investment is ₹500: You must deposit at least ₹500 per financial year to keep the account active. If you miss a year entirely, the account becomes dormant and attracts a penalty of ₹50 per missed year, along with the minimum deposit requirement, to reactivate it.
Triple tax exemption (EEE status): PPF enjoys Exempt-Exempt-Exempt tax treatment in India — the deposit is exempt from income tax under Section 80C (up to ₹1.5 lakh per year), the annual interest credited is fully exempt, and the maturity amount is completely tax-free. This is the most comprehensive tax benefit available on any government savings scheme, and it makes the effective post-tax return significantly higher than FD at comparable interest rates for taxpayers in the 20-30% bracket.
Partial withdrawal is allowed from Year 7: From the 7th financial year onwards, you can withdraw up to 50% of the balance at the end of the 4th year preceding the year of withdrawal, or 50% of the balance at the end of the immediately preceding year, whichever is lower — once per financial year. The withdrawal is tax-free.
Extension after 15 years: After the initial 15-year lock-in, you can extend the PPF account in 5-year blocks — with or without fresh contributions. Extending with contributions means you continue depositing up to ₹1.5 lakh per year and earning interest on the growing balance. Extending without contributions means the balance continues to earn interest but you stop depositing — useful if you no longer need the tax deduction but want to continue growing the corpus.
How To Use The Calculator
Step 1 — Enter Your Yearly Investment Amount
Type the amount you plan to invest in PPF each financial year. The maximum allowed is ₹1,50,000 as shown in the hint below the field. Most investors who want to maximise tax savings under Section 80C invest the full ₹1.5 lakh annually. If you are just starting or have limited funds, enter your actual planned amount — even ₹500 or ₹10,000 annually shows meaningful long-term growth.
Step 2 — Enter the Interest Rate
The current PPF interest rate is 7.1% per annum (as of July 2026). Type 7.1 in the Interest Rate field. If the government revises the rate in a future quarter, simply update this field with the new rate to recalculate. The PPF interest rate is the same regardless of which bank or Post Office you open your account at.
Step 3 — Set the Tenure
Enter 15 for the standard lock-in period. The field notes that 15 years is the minimum required. If you plan to extend after maturity — say 20 or 25 years — you can enter that number to see the significantly larger corpus that results from a longer investment horizon.
Step 4 — Choose Investment Mode
Select Yearly (Lump Sum) if you plan to make a single annual deposit at the start of each financial year (ideally before April 5th). Select Monthly if you plan to spread your deposits across the year in monthly instalments. The lump-sum approach at the start of the year generally produces slightly better returns because the full year's contribution earns interest from the first month.
Step 5 — Click Calculate Returns
Hit the green Calculate Returns button. Your PPF Maturity Details appear immediately — Total Invested, Total Interest, Maturity Amount (Tax-Free), and Net Return on Investment. Scroll down to see the Wealth Breakdown doughnut chart alongside the formula, and then the complete Year-by-Year Growth Schedule. Download as TXT or CSV to save your full projection for records or sharing with a financial advisor.
Step-by-Step Example
Scenario: Rohan Invests ₹1,50,000 Per Year in PPF for 15 Years at 7.1%
Rohan is a 30-year-old software engineer in Hyderabad paying 20% income tax. He opens a PPF account and commits to investing the maximum ₹1,50,000 every year. He uses the calculator to understand exactly what he will have at 45 when the account matures.
Input Data:
- Yearly Investment: ₹1,50,000
- Interest Rate: 7.1% p.a.
- Tenure: 15 Years
- Investment Mode: Yearly (Lump Sum)
Output from the Tool:
Year-by-Year Highlights from the Growth Schedule:
- Year 1: Deposits ₹1,50,000 → Earns ₹10,650 interest → Closing Balance ₹1,60,650
- Year 5: Opening ₹7,14,333.75 → Deposits ₹1,50,000 → Earns ₹61,367.70 → Closing ₹9,25,701.44
- Year 10: Opening ₹19,32,281.96 → Deposits ₹1,50,000 → Earns ₹1,47,842.02 → Closing ₹22,30,123.98
- Year 15: Opening ₹36,48,514.68 → Deposits ₹1,50,000 → Earns ₹2,69,694.54 → Closing ₹40,68,209.22
Interpretation: Rohan invested ₹22.5 lakh of his own money over 15 years and earned ₹18.18 lakh in completely tax-free interest — an 80.81% net return on his investment. His maturity corpus of ₹40.68 lakh arrives tax-free at age 45. That is the compounding snowball at work.
The tax saving angle: Since Rohan is in the 20% tax bracket, each ₹1,50,000 annual PPF deposit saves him ₹30,000 in income tax (20% of 1,50,000). Over 15 years, that adds up to ₹4,50,000 in tax savings in addition to the ₹18.18 lakh interest — making the total benefit of choosing PPF over a taxable instrument even more significant.
PPF vs FD — Which One Should You Choose?
This is one of the most frequently searched comparisons in Indian personal finance, and the honest answer is that the right choice depends on your tax bracket, liquidity needs, and investment horizon — not on a single "winner."
PPF wins clearly if you are in the 20% or 30% income tax bracket, you do not need the money for 15 years, and you want government-backed safety with zero market risk. At 7.1% tax-free, PPF effectively gives a pre-tax equivalent yield of approximately 8.9% for a 20% taxpayer and 10.1% for a 30% taxpayer — better than most FDs on an after-tax basis.
FD wins if you need your money back in under 5 years, since PPF has a 15-year lock-in with limited early withdrawal. FDs also offer more flexibility in tenure, and if you are in the 0% or 5% tax bracket, the FD's slightly higher nominal rate might produce comparable after-tax returns to PPF without the long lock-in.
The practical answer for most salaried investors: max out PPF first for its EEE tax status and government guarantee, then use FD for any additional savings with shorter time horizons. These two instruments complement rather than compete with each other in a well-structured personal finance plan.
Common Mistakes to Avoid
Depositing after the 5th of April — PPF interest for any given month is calculated on the lowest balance between the 5th and the last day of the month. If you deposit your annual contribution after April 5th, you lose one full month of interest on that deposit for the financial year. Always deposit before April 5th — ideally on April 1st or 2nd — to earn interest for all 12 months of the year.
Treating the PPF interest rate as guaranteed forever — The 7.1% rate is the current government-set rate, reviewed quarterly. The government can and does revise this rate — PPF has seen rates ranging from 8.5% to 12% in earlier decades and has been at 7.1% since April 2020. This calculator lets you model different rate scenarios by changing the Interest Rate field, which is a good way to see a realistic range of maturity outcomes rather than anchoring to a single rate assumption for 15 years.
Missing a year and not reactivating the account — If you fail to deposit the minimum ₹500 in any financial year, your PPF account becomes dormant. You cannot make fresh deposits or take loans against a dormant account. To reactivate it, you must pay ₹50 penalty per dormant year plus the minimum deposit for each missed year. Set a reminder to deposit at least ₹500 in years when your finances are tight, rather than letting the account go dormant.
Not checking extension options before closing at maturity — Many investors automatically close their PPF account at 15 years and withdraw everything. But extending with contributions for another 5 years (years 16-20) often produces a larger incremental gain than the first 5 years, because the compounding base is now ₹40+ lakh rather than zero. Run the calculator with 20 or 25 years entered in the Tenure field to see the significantly higher corpus that results from continuing past the initial 15-year period.
Investing in the wrong month and misunderstanding the lock-in end date — The 15-year tenure is counted from the end of the financial year in which the account was opened, not from the actual date of opening. An account opened in January 2027 (FY 2026-27) matures on March 31, 2042 — not in January 2042. This distinction matters for financial planning, especially if you have a specific goal date in mind.
Calculate Your PPF Maturity Value Right Now — Free, Instant, No Signup
Yearly or monthly investment mode. Full 15-year growth schedule included.
Downloadable TXT and CSV report available after calculation.
Open the PPF CalculatorFrequently Asked Questions
What is PPF and who should invest in it?
PPF (Public Provident Fund) is a government-backed long-term savings scheme in India offering a fixed annual interest rate set by the Finance Ministry each quarter. It is ideal for salaried and self-employed individuals in the 20% or 30% income tax bracket who want a safe, tax-efficient way to build long-term wealth. The scheme's EEE (Exempt-Exempt-Exempt) tax status — where contributions, interest, and maturity are all tax-free — makes it one of the most tax-efficient savings instruments available to Indian investors.
What is the current PPF interest rate?
The current PPF interest rate is 7.1% per annum, unchanged since April 2020. This rate is reviewed by the Government of India every quarter and announced by the Finance Ministry. Unlike bank FD rates which vary by institution, PPF has one uniform rate applicable across all authorised banks (SBI, all nationalised banks, select private banks) and all Post Offices across India. Always verify the current rate on the NSI (National Savings Institute) website or your bank's official page before doing final planning calculations.
Can I invest more than ₹1.5 lakh per year in PPF?
No. ₹1,50,000 per financial year is the hard maximum limit set by the government. Any amount deposited above this limit in a financial year does not earn any interest and is not eligible for Section 80C tax deduction. It simply sits idle in the account and will be returned without interest at maturity. If you want to invest more than ₹1.5 lakh annually for tax-free growth, consider opening a PPF account in your spouse's name or a minor child's name as a separate account (though note that for a minor's account, the 80C deduction goes to the parent/guardian).
Is PPF interest really 100% tax-free?
Yes. PPF has EEE (Exempt-Exempt-Exempt) tax status under Indian income tax law. The annual contribution of up to ₹1.5 lakh is deductible under Section 80C. The interest credited to your PPF account each year is completely exempt from income tax. And the full maturity amount — principal plus all accumulated interest — is entirely tax-free on withdrawal. This triple exemption makes PPF uniquely favourable compared to FDs, where interest is fully taxable at your income slab rate.
What happens to my PPF account after 15 years?
At the end of the 15-year lock-in period, you have three options. First, you can close the account and withdraw the full maturity amount tax-free. Second, you can extend the account for 5-year blocks with fresh contributions — up to ₹1.5 lakh per year — and continue earning interest and 80C benefits. Third, you can extend without making any new contributions — the balance continues to earn PPF interest annually, you can make one partial withdrawal per year, but no new 80C deduction is available. Extension must be notified to the bank or Post Office within one year of maturity.
When is the best time to deposit in PPF each year?
The best time is before the 5th of April — ideally on April 1st or April 2nd — at the start of each financial year. PPF interest is computed on the minimum balance between the 5th and the last day of each month. By depositing your full annual contribution early in April, you ensure it earns interest for all 12 months of the financial year. A deposit made on April 6th instead of April 4th costs you one full month of interest on ₹1.5 lakh — which at 7.1% is approximately ₹887.50 lost unnecessarily.
Can I take a loan against my PPF account?
Yes. You can take a loan against your PPF account from the 3rd financial year to the 6th financial year of the account. The maximum loan amount is 25% of the balance at the end of the 2nd year preceding the year of loan application. The loan must be repaid within 36 months. The interest on this loan is 1% more than the PPF rate (currently 8.1% if the PPF rate is 7.1%) — which is often lower than personal loan rates from banks. Loans are not available after partial withdrawals have begun (from Year 7 onwards).
Can I have more than one PPF account?
No. An individual can hold only one PPF account in their own name. However, you can also open and manage a PPF account on behalf of a minor child, and you can be the guardian/depositor for a spouse's PPF account. Each account has its own ₹1.5 lakh annual limit, so a family of three can collectively invest up to ₹4.5 lakh per year across three separate PPF accounts. Note that for a minor's account, the deposits count toward the parent/guardian's own ₹1.5 lakh annual limit.
What is the difference between Yearly Lump Sum and Monthly investment modes in this calculator?
In Yearly Lump Sum mode, the calculator assumes you deposit the full annual amount at the start of each financial year (April). This gives your full contribution 12 months of interest for the year. In Monthly mode, the calculator assumes you spread the annual investment across 12 equal monthly deposits. Monthly deposits earn interest from the month they are deposited — April's deposit earns for 12 months, May's for 11, and so on. The lump-sum approach at the start of the year consistently produces slightly higher returns, which is why most PPF optimisation guides recommend the April lump-sum strategy.
Is this PPF calculator free and does it require any login?
Completely free and no login required. All calculations happen directly in your browser — your investment amount and personal details are never sent to any server. Access the calculator directly at allinonetools.net/ppf-calculator on any device — mobile, tablet, or desktop. After calculating, you can download your full 15-year growth schedule as a TXT or CSV file without any registration or signup.
Official References and Further Reading
NSI — National Savings Institute, Ministry of Finance
https://www.nsiindia.gov.in
NSI is the official government body under the Ministry of Finance that administers all Small Savings Schemes in India, including PPF. Their website carries the official interest rate announcements for each quarter, scheme rules, forms for account opening and closure, and guidelines on partial withdrawal, loan, and extension procedures. This is the most authoritative source for verifying current PPF rules, interest rates, and any regulatory changes.
Income Tax Department — Government of India
https://www.incometax.gov.in
The Income Tax Department's portal is the reference point for understanding Section 80C deduction limits, EEE tax status, and how PPF interest and maturity is treated under the Income Tax Act. If you are comparing Old Regime vs. New Tax Regime benefits of PPF (note: 80C deductions are not available under the New Regime), the Income Tax portal's guides and e-filing resources provide accurate, legally binding information.
Tool Referenced in This Article
PPF Calculator — AllInOneTools.net
Free PPF maturity calculator using the annual annuity formula, supporting Yearly Lump Sum and Monthly investment modes. Shows Total Invested, Total Interest, Maturity Amount (Tax-Free), Net Return on Investment, Wealth Breakdown chart, and a complete Year-by-Year Growth Schedule. Downloadable TXT and CSV reports included. No login required.
Conclusion
PPF is one of the few financial decisions where the mathematics strongly favour action over deliberation. The combination of government guarantee, annual interest compounding, Section 80C deduction, and completely tax-free maturity creates a return profile that is genuinely difficult to replicate with any other comparably safe instrument — especially for taxpayers in the 20% and 30% brackets.
The numbers from the PPF Calculator make this concrete: ₹1,50,000 invested annually for 15 years at 7.1% produces ₹40,68,209 in a tax-free lump sum. You invest ₹22.5 lakh of your own money and walk away with ₹40.68 lakh — a gain of ₹18.18 lakh that costs you nothing in income tax.
If you have not started a PPF account, the best time to start was 15 years ago. The second best time is before April 5th this year, so your first deposit earns a full 12 months of interest. Use the calculator to choose your annual investment amount, see your expected maturity figure, and download the growth schedule — then walk into your bank or Post Office with the numbers already in hand.
