Besides being a secure place to keep your funds and making everyday transactions easier, a savings account also helps your hard-earned money grow. The savings account interest rate steadily adds to your account balance. But with regular transactions and changing balances, how does the interest calculation work? If you have this question, this blog breaks down the formula and provides practical tips to optimise your interest earnings.
How savings account interest works
Savings account interest rates are rewards for maintaining an account with the bank. Banks offer interest as they get to use your deposits for lending. Here’s how you earn interest on your savings:
- Calculated on the daily closing balance
Most banks use the daily balance method, where the balance at the end of each day becomes the base for interest calculation.
- Credited periodically
Despite daily calculations, banks usually credit the total interest on a quarterly basis. Some banks like IDFC FIRST Bank increase the credit frequency to monthly to enhance the compounding effect.
- Tracking through tools
You can estimate the interest with tools like a savings account calculator. It gives a realistic view of your returns based on the account balance and interest rate.
Formula for the calculation of savings account interest
Once you know how savings account interest links to your daily balance, understanding the formula becomes easier. Whether you’re evaluating interest against your existing account or planning to open a new account, you can calculate interest using the formula:
Interest = Daily balance x Savings account interest rate X Number of days / Days in a year x 100
Here,
- The daily balance is the amount at the end of the day
- The savings account interest rate is the annual rate offered by the bank
- The number of days is the period during which a particular closing balance remains unchanged. Banks break the calculation into different balance periods and add them together.
- Days in a year represent 365 days or 366 days for a leap year.
Let’s consider an example to understand the calculation better:
Suppose your account balance is ₹50,000 and the bank offers an annual interest rate of 6%. Based on a stable balance for 30 days, the interest would be:
50,000 x 6 x 30 / 365 x 100 = 246.58
This means you earn around ₹247 for the steady account balance maintained for 30 days. As your balance changes, the calculation resets based on the new daily closing balance. The total interest earned during the crediting period is the sum of such calculations on changing balances.
You can simplify this calculation with a savings account interest calculator. It gives you an accurate estimate of interest earnings based on your account balance and savings account interest rate.
Tips to maximise your savings account interest
The choices you make with your savings account make a noticeable difference in the interest earnings. Here are some practical ways to make your savings work harder:
- Maintain a higher balance for longer
Since the interest on a savings account is calculated on the daily closing balance, the longer you maintain a higher balance, the more you earn. Maintain a threshold for surplus funds to continue earning interest.
- Time your deposits wisely
Depositing large sums early give the money more days to stay in your account and earn interest. For example, depositing ₹10,000 on the 1st of the month is likely to earn more interest than the same amount on the 20th.
- Compare interest offers
Check interest rates offered across banks and the tier-based rate slab for certain account balances. For example, IDFC FIRST Bank offers up to 6.5% interest rate based on your account balance.
- Pay attention to account charges
Check the charges like ATM fees, non-maintenance charges, service costs, etc. Understanding the same helps you use these services cautiously and reduce the impact on net interest earnings.
Final words
Understanding how the savings account interest rate is calculated is the first step to maximising your savings. It helps you see the impact of your everyday banking habits, like deposits, withdrawals, and balance maintenance, on returns. While the growth of savings is gradual, consistency and compounding effect make them meaningful.