PPF Investment Formula: You just need to understand the rules of interest calculation in PPF account and follow the golden rule of 5th of every month.

PPF Investment: The Public Provident Fund (PPF) is one of the most popular small savings options in the country, offering safe and reliable returns. Consistency is crucial when investing in PPF. However, if you plan your investments at the right time, you can earn over ₹1 lakh in extra interest on your PPF account by simply depositing the same amount. To do this, you simply need to understand the rules for calculating interest on a PPF account and follow the golden rule of the 5th of every month.

This is the golden rule and interest math for the 5th of every month.

The investment timeframe for PPF is quite flexible, but when you deposit money directly impacts your returns. As a rule, interest on a PPF account is calculated based on the minimum balance between the 5th of the month and the last day of that month.

This simply means that if you deposit money into your account on or before the 5th of any month, that deposit is included in the interest calculation for that entire month. Conversely, if you deposit money after the 5th, that deposit will not earn any interest for that month and will only be counted for interest from the following month. As a reminder, the annual interest rate on PPF is 7.1 percent until August 2026.

Lump sum vs monthly investment: What is the difference over a 15-year maturity period?

The minimum amount that can be deposited in a PPF account per financial year is ₹500 and the maximum amount is ₹1.5 lakh. If you have the full amount available at the beginning of the financial year, a lump sum deposit of ₹1.5 lakh before April 5th is the most beneficial. This earns you 7.1 percent interest on the entire amount for the entire 12 months.

If an investor does not have a lump sum fund at the beginning of the financial year, they can deposit a total of ₹1.5 lakh over 12 months in the form of monthly installments of ₹12,500 each month. If compared to a 15-year maturity period, at the current interest rate of 7.1%, a lump sum deposit of ₹1.5 lakh before April 5th every year results in a maturity fund of approximately ₹40.68 lakh after 15 years. Similarly, a ₹12,500 deposit before the 5th of every month results in a corpus of approximately ₹39.44 lakh after 15 years.

Thus, just by choosing the right time to invest a lump sum at the beginning of the financial year, the investor gets a direct extra benefit of approximately ₹1.24 lakh in 15 years.

Why monthly SIP is a better option for the salaried class

Although a lump sum investment offers slightly higher returns, monthly installments (SIPs) are considered more practical and convenient for salaried or salaried investors. Instead of worrying about arranging a lump sum of ₹1.5 lakh by the end of the year, it's easier to save a fixed amount from your salary each month and contribute it to a PPF.

A major practical advantage of monthly investing is that if money sits in a bank account for several months, it's less likely to be spent on household expenses, vacations, or other unnecessary things. Setting up an auto-debit or bank transfer before the 5th of each month helps build a disciplined savings habit.

Benefits of tax exemption and important advice for investors

PPF is also known for its EEE tax category. Under this scheme, deposits up to ₹1.5 lakh annually are eligible for tax exemption under Section 80C in the old tax regime. Furthermore, the interest earned and the entire maturity amount is also completely tax-free. Investors opting for the new tax regime should ensure they consider it as a tax-saving instrument only after carefully evaluating the tax exemption claims.

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