If you have a Public Provident Fund (PPF) account, the first week of April is not just the start of a new financial year—it is the most critical window to maximize your savings. To get the highest possible returns on your investment, you should aim to deposit your funds by 5 April, itself. Here is a simple guide on how the PPF interest calculation works and why timing matters more than you might think. The ‘5th of the Month’ rule It is imperative for you to comprehend how the government calculates interest on PPF. While the interest is credited to your account at the end of the financial year, it is calculated monthly. The rules state that interest for a specific month is calculated on the lowest balance in the account between the end of the 5th of every month and the end of the last day of that month. If you deposit on 5 April: You earn interest for the whole month of April. If you deposit on 6 April: You earn lower interest for April. ₹1.5 Lakh Lump Sum investment – best strategy The maximum amount you can invest in a PPF in one fiscal is ₹1.5 lakh. If you have the funds available, depositing the entire ₹1.5 lakh before 5 April is the smartest move you can make. By doing this, you ensure that your entire investment earns interest for all 12 months of the year. Example: Lump sum vs monthly deposits Let’s look at two investors, Rahul and Nikita, assuming an interest rate of 7.1%: Nikita (The Early Bird): She deposits ₹1.5 lakh on 3 April. Because her money is in the account before end of 5 April, she earns interest on the full amount for the entire month. Rahul (The Monthly Saver): He deposits ₹12,500 every month (totaling ₹1.5 lakh). However, he often makes deposits on the 10th of each month. The Result: Rahul loses out a certain amount of interest for the “current” month every single time he deposits after the 5th. Over 15 years, the difference in the final corpus between Rahul and Nikita could be several lakhs of rupees, simply because of the timing of their deposits. PPF essentials: Limits and lock-ins To manage your PPF account effectively, you should keep these basic rules in mind: Investment Limits: You must invest a minimum of ₹500 per financial year to keep the account active. The maximum limit is ₹1.5 lakh per year. Any amount deposited over this limit will not earn any interest and will not be eligible for tax deductions. Lock-in Period: PPF is a long-term savings tool. It comes with a 15-year lock-in period. The account only fully matures after 15 years. You can also extend the account in blocks of 5 years after maturity. If you want your money to generate full interest on PF account, don’t wait until the end of the month or the end of the year. Check your bank balance today, and if you plan to contribute to your PPF, ensure the transaction is completed on or before 5 April. Those few days of delay could cost you a significant amount of tax-free wealth in the long run. Interest rates on Small Savings Schemes Post navigation Post Office RD offers 6.7% interest:You can start investing with 100 rupees, know its special features How fraudsters scam people in wake of LPG crisis:From scammers’ modus operandi to precautions you should take, find all details here