FD interest and the Rs 5 lakh insurance limit: a worked example
A fixed deposit, or FD, is the first investment many families trust. You give a bank a sum for a fixed period, and it pays interest. Two questions come up again and again: how much will it grow to, and how safe is the money if the bank gets into trouble? This guide answers both with a worked example you can repeat yourself.
How the interest builds up
Most banks compound FD interest every quarter. That means interest is added to the balance four times a year, and the next interest is earned on the larger balance. The formula is: maturity = P x (1 + r/4) ^ (4 x years), where P is the deposit and r is the yearly rate written as a decimal.
For the example we assume a rate of 7% a year. This is only an assumption to show the method. Your bank's rate depends on the bank, the tenure and the date, so use the rate on your own receipt.
- Deposit Rs 1,00,000 for 5 years at 7%, compounded quarterly.
- Maturity = 1,00,000 x (1.0175) ^ 20, which is about Rs 1,41,478.
- Interest earned is about Rs 41,478.
Without compounding, simple interest would give 7% x 5 = Rs 35,000. The extra Rs 6,478 comes from interest earning interest. We checked the figure with two separate calculations.
What the Rs 5 lakh limit covers
The Deposit Insurance and Credit Guarantee Corporation (DICGC) is the body that insures bank deposits. Its official FAQ says each depositor in a bank is insured up to a maximum of Rs 5,00,000, covering both principal and interest, held in the same right and same capacity. All funds in the same type of ownership at the same bank are added together. If you hold deposits in more than one bank, the limit applies separately to each bank. The premium is borne entirely by the insured bank, not by you.
Why the interest matters for the limit
Take a family that puts Rs 4,50,000 in one bank's FD at an assumed 7% compounded quarterly. After one year the balance is about Rs 4,82,337, still under Rs 5 lakh. After five years it would be about Rs 6,36,650. Because the cover is for principal plus interest up to Rs 5 lakh, about Rs 1,36,650 of that balance would sit above the limit if all of it were held in one bank in the same capacity. The FAQ also says the amount is measured on the date a bank's licence is cancelled or a merger scheme takes effect, so the balance on that date counts.
Spreading deposits across banks is one way people manage this, but it is your decision, and a bank's own safety is a separate question. Look at the receipt of each FD and keep a list of what you hold where.
Tax on FD interest
FD interest is added to your income and taxed at your slab. Whether the bank deducts tax at source depends on limits set by law, which have changed in recent years, so check the current rule on the Income Tax Department website or with your bank.
Try the Gunaka FD calculator with your own amount, rate and tenure. It gives an estimate, not financial advice.
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