How is PPF interest calculated?

PPF interest is calculated monthly on the lowest balance in your account between the 5th and the last day of the month. However, the accumulated interest is only credited to your account at the end of the financial year (March 31st).

What is the Annuity Due formula for PPF?

The Annuity Due formula accounts for investments made at the beginning of the period. By depositing your money before April 5th, your funds earn interest during that very first year, leading to a higher maturity value compared to end-of-year deposits.

Can I extend my PPF account after 15 years?

Yes, after the initial 15-year maturity period, you can extend your PPF account indefinitely in blocks of 5 years. You can choose to extend it with or without making further fresh contributions.

Ponmagan Scheme Calculator

PPF Account Details

Yearly Investment (Rs.)

Time Period (Years)

Rate of Interest (%)

Maturity Projection

Maturity Value

Rs. 2,71,264

Invested Amount

Rs. 1,50,000

Total Interest

Rs. 1,21,264

Wealth Gain Multiple

1.81x

A Public Provident Fund (PPF) calculator is an essential tool for Indian investors looking to build secure, long-term, tax-free wealth. Backed by the government, the PPF scheme offers guaranteed returns and acts as a financial safety net for retirement or major life events. Because the interest calculation rules are highly specific, using an accurate calculator ensures your financial planning is on the right track.

How the PPF Calculation Actually Works

Many standard financial calculators get PPF maturity values wrong because they use the ordinary annuity formula, which assumes deposits are made at the end of the year. However, smart investors deposit their PPF funds at the *beginning* of the financial year (before April 5th) to earn interest for that entire first year. This requires the "Annuity Due" formula.

The standard PPF formula for start-of-year deposits is: F = P * (((1 + i)^n - 1) / i) * (1 + i)

Where F is the final maturity amount, P is your yearly deposit, i is the interest rate (divided by 100), and n is the number of years. For example, if you deposit Rs. 10,000 every year at 7.1 percent for 15 years, your actual maturity value leaps past Rs. 2,71,000 because your money benefits from that extra compounding cycle.

How to Use This Tool

Enter your total yearly investment. You must invest a minimum of Rs. 500 and a maximum of Rs. 1,50,000 per financial year.
Select your time period. A PPF account has a mandatory lock-in period of 15 years, but can be extended in blocks of 5 years.
Review the interest rate. It defaults to the current government rate, but you can adjust it to simulate future rate changes.
The tool instantly calculates your maturity value, total invested principal, and the pure interest you earned over the tenure.

Frequently Asked Questions

Why is my maturity value slightly different on other sites?

Minor discrepancies between calculators usually happen because of how the post office handles decimal rounding. Officially, PPF interest is calculated monthly on the lowest balance between the 5th and the end of the month, but it is only credited annually. The official system rounds interest down to the nearest whole rupee each year before compounding. This calculator provides a highly accurate mathematical projection using the Annuity Due formula.

Can I withdraw my money before 15 years?

A PPF account is designed for long-term saving, so complete withdrawal is generally not permitted before 15 years. However, you are allowed to make partial withdrawals starting from the 7th financial year, subject to certain conditions and limits set by the governing rules.

What are the tax benefits of a PPF account?

PPF is considered one of the best tax-saving instruments because it falls under the "Exempt-Exempt-Exempt" (EEE) category. Your annual deposits are deductible under Section 80C, the interest earned every year is not taxed, and the final maturity amount you withdraw is completely tax-free.