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Finance Formula

PPF Formula

Published on July 05, 2026 • Last updated July 05, 2026

Mathematical Equation

$$F = P \times \frac{(1 + r)^n - 1}{r}$$

Variable Definitions

F

F

Maturity amount of the Public Provident Fund

P

P

Annual deposit amount (made at start of year)

r

r

Annual interest rate (set by government, e.g., 7.1% as decimal, r = 0.071)

n

n

Total number of years (PPF lock-in is 15 years)

Detailed Explanation

The Public Provident Fund (PPF) is a popular long-term savings-cum-tax-saving instrument in India. It offers guaranteed interest rates set quarterly by the government, with tax-free returns and tax deductions under Section 80C.

How to Calculate: Step-by-Step

1. Identify the annual contribution amount (P, maximum INR 1.5 Lakhs). 2. Identify the current annual PPF interest rate (r). 3. Determine the tenure in years (n, minimum 15 years). 4. Calculate the maturity amount (F) using the compound interest formula for an ordinary annuity.

Worked Calculation Example

Contributing INR 1,50,000 annually for 15 years at an interest rate of 7.1%: - Annual Contribution (P) = INR 1,50,000 - Interest Rate (r) = 7.1% = 0.071 - Tenure (n) = 15 years - Maturity Value (F) = INR 27,12,139 - Total Principal Invested = INR 22,50,000 - Total Interest Earned = INR 4,62,139

Common Use Cases

  • Risk-free wealth accumulation
  • Long-term tax planning under Section 80C

Frequently Asked Questions

Yes, you can extend your PPF account indefinitely in blocks of 5 years, either with or without fresh contributions.

The default lock-in period is 15 years, though partial withdrawals and loans against the balance are permitted starting from specified years.

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