Overdraft Interest Calculator
Compute precise daily simple interest charges on business lines of credit or bank overdraft arrangements instantly.
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What Is the Overdraft Interest Calculator?
An overdraft allows you to withdraw more money than you have in your bank account, up to a pre-approved limit. Our Overdraft Interest Calculator helps you understand the cost of using this facility by computing the interest charged on your overdrawn balance.
Unlike a standard loan where interest is calculated on the full principal from day one, overdraft interest is typically calculated on the daily outstanding balance. This means you pay interest only for the amount and duration you actually use, making overdrafts flexible but potentially expensive if used carelessly.
Anyone with an overdraft facility, small business owners managing cash flow, and individuals comparing overdraft costs against other short-term borrowing options will find this calculator useful.
How to Use This Calculator
Enter the overdraft limit
The maximum amount you are approved to overdraw from your account.
Enter the average overdrawn amount
The typical balance you maintain in overdraft each month.
Set the annual interest rate
Overdraft interest rates are typically higher than standard loan rates.
Enter the number of days overdrawn
Overdraft interest is calculated daily, so the number of days matters.
Review the interest cost
See the total interest charged for the overdraft period.
Real-World Example
Meet Deepak. He runs a small electronics retail store in Delhi that experiences seasonal cash flow gaps. His bank has approved an overdraft facility of 5,00,000 at 15% per annum. He typically needs to overdraft about 2,00,000 for 30 days each month during the festive season to stock up on inventory before Diwali.
Using the Overdraft Interest Calculator, Deepak calculates the cost of using this facility:
Overdraft Limit
5,00,000
Average Overdrawn
2,00,000
Annual Interest Rate
15%
Days Overdrawn
30
Interest Charged
2,466
Annual Cost (if used fully)
75,000
Deepak sees that using the overdraft for 30 days each month would cost him about 2,466 per month in interest, which is easily covered by the additional profit from festive season sales. He also notes that the annual cost of 75,000 assumes full utilization of the 5-lakh limit, whereas his actual usage of 2,00,000 keeps costs manageable. He decides to use the overdraft facility for the three-month festive period and repay fully during the lean months.
The Mathematics Behind Overdraft Interest Calculation
Overdraft interest is calculated on the daily outstanding balance using the daily periodic rate. The interest for a given period is:
Frequently Asked Questions
Overdraft interest is calculated daily on the outstanding balance. You pay only for what you use and only for the days you use it. Loans charge interest on the full principal from disbursement.
Overdraft rates are usually higher than secured loans, ranging from 10% to 24% annually. However, because you pay only on the used amount, short-term usage can be cost-effective.
Yes. Banks may charge overdraft setup fees, annual maintenance fees, and penalty charges if you exceed your approved limit. Always read the fine print.
While both have relatively high interest rates, there are key differences. Overdraft interest is calculated daily on the outstanding balance and charged only for the period you use the facility. Credit card interest is also calculated daily but applies to the entire outstanding balance from the statement date if you do not pay in full by the due date. Overdrafts typically have lower interest rates than credit cards, ranging from 10-24% compared to 30-48% for credit cards.
Yes, most overdraft facilities are demand loans, meaning the bank can revoke or reduce your overdraft limit at any time without prior notice, especially if your account conduct deteriorates or your credit score declines. This reinstatement risk is an important consideration when relying on overdrafts for regular business operations. Maintaining a good relationship with your bank and a healthy credit profile reduces this risk.
Overdraft interest rates in India vary by the type of overdraft and the lender. For overdrafts against fixed deposits, rates are typically 1-3% above the FD rate, ranging from 6-9% annually. For unsecured overdrafts on savings accounts, rates range from 12-24% per annum. Business overdraft facilities against inventory or receivables carry rates of 10-18%. Penalty rates for exceeding the overdraft limit can be 2-5% higher than the standard rate. Interest is calculated on the daily closing balance, so the effective cost depends on how much you use and for how long.
An overdraft is a revolving credit facility that allows you to withdraw up to a sanctioned limit from your bank account, paying interest only on the amount used and only for the days it is used. A personal loan is a one-time lump sum disbursed upfront, repaid in fixed EMIs over a set tenure. Overdrafts offer flexibility you can draw, repay, and redraw within the limit but charge higher interest rates (12-24%). Personal loans offer lower rates (10-18%) but lack flexibility. Overdrafts suit irregular cash flow needs, while personal loans are better for planned, one-time expenses.
The maximum overdraft limit on a savings account in India depends on the bank, your relationship, and your credit profile. Most public sector banks offer overdrafts of 5,000 to 25,000 on basic savings accounts as a pre-approved facility. Premium savings accounts with higher average balances may qualify for limits of 50,000 to 5 lakh. For overdrafts against fixed deposits, the limit is typically 70-90% of the FD amount. Salary account overdrafts can be up to 2-3 times your monthly salary depending on the bank and your employment history with the company.
Yes, most Indian banks offer an overdraft facility against fixed deposits, typically up to 70-90% of the FD amount. This is one of the cheapest forms of overdraft because it is fully secured by your FD. The interest rate is usually 1-3% above the FD interest rate, making it very affordable at around 7-10% per annum. The FD continues to earn interest even while the overdraft is active, so the net cost is the difference between the FD rate and the overdraft rate. For example, if your FD earns 7% and the overdraft against it charges 9%, your effective cost is just 2%.
An overdraft facility can affect your CIBIL score in several ways. If you use a significant portion of your overdraft limit regularly, it increases your credit utilization ratio, which can lower your score. Late payments or exceeding the overdraft limit can also negatively impact your score. However, responsible use of an overdraft maintaining low utilization and paying interest on time can help build a positive credit history. Unlike a loan where the full EMI is reported as an obligation, overdraft utilization is reported as a revolving credit, and keeping utilization below 30-40% of the limit is ideal for your credit health.
Key Takeaways
Overdraft interest is calculated on daily outstanding balance.
You pay interest only for the amount and duration used.
Rates are higher than standard loans but flexible.
Short-term overdraft usage can be cost-effective.
Additional fees may apply beyond interest charges.
Why This Matters
Overdrafts are a convenient but expensive form of credit. Understanding the daily interest calculation helps you minimize costs and use overdrafts strategically rather than habitually.
This calculator is for educational and planning purposes. Consult a qualified professional for personalized advice.