Millions of people confidently invest in a 15-Year Public Provident Fund (PPF) every year to secure their retirement and save on taxes. But recently, a friend of mine checked his PPF passbook and realized his interest payout was much lower than he mathematically expected. Did the government lower the interest rate secretly? No. He simply fell victim to the most expensive mathematical trap in PPF history: The 5th of the Month Rule. Today, I am not giving you basic investment advice. Instead, I want to show you the exact mathematical logic behind how PPF interest is calculated, and why depositing your money on the 6th of the month is a massive financial mistake. The Real Math: How is PPF Interest Calculated? While PPF interest is compounded annually (credited at the end of the financial year), it is mathematically calculated on a monthly basis. But here is the catch: The interest is not calculated on your average balance. According to the official rules, it is calculate...
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