RD Calculator (Recurring Deposit)

A Recurring Deposit (RD) is a savings instrument where you deposit a fixed amount every month for a chosen tenure, and the bank pays interest on it, compounded quarterly. It's a popular option for disciplined, lower-risk saving since it combines the habit of a monthly SIP with a locked-in rate that isn't directly linked to equity-market movements — every installment earns that fixed rate regardless of how markets perform. (Deposit insurance/protection limits, where applicable, vary by country and institution.)

Formula used: M = R × [(1+i)ⁿ − 1] ÷ (1 − (1+i)^(−1/3)), where R is your monthly installment, i is the quarterly interest rate (annual rate ÷ 400), and n is the total number of quarters in your tenure. This model assumes monthly installments with quarterly interest crediting, expressed over complete quarterly periods — it's a calculation approach commonly used for estimating RD maturity values in India, though your bank's exact figure may differ slightly depending on deposit timing, compounding conventions, and rounding rules.

Worked example: for a monthly deposit of 5,000 (in any currency — for example, ₹5,000 for a depositor in India) at 6.5% p.a. for 24 months (8 quarters), the quarterly rate i = 6.5/400 = 0.01625. Applying the formula gives a maturity value of approximately 128,425 against a total investment of 120,000 — an interest earning of about 8,425 over two years.

A second example — longer tenure: the same 5,000/month at 6.5% p.a. for 60 months (5 years, 20 quarters) grows to roughly 354,954 against a total investment of 300,000 — about 54,954 in interest. Notice the interest share of the total roughly doubles proportionally as tenure lengthens from 2 to 5 years, since more of the money spends more time compounding.

Unlike a fixed deposit where the entire principal earns interest from day one, in an RD each monthly installment earns interest only from the date it is deposited, which is why the effective yield is a bit lower than the quoted interest rate for the same tenure. Premature withdrawal of an RD usually attracts a penalty and a lower effective interest rate, so RDs work best when you're confident you won't need the money before maturity.

Why RD interest feels lower than the quoted rate

A common point of confusion: if the RD is "6.5% p.a." why does the total interest earned look like less than 6.5% of the total deposited? The answer is that each installment only earns interest for the remaining months until maturity — your first installment earns interest for the full tenure, but your last installment earns interest for only one quarter. Averaged across all installments, the effective yield on the total money deposited works out lower than the quoted annual rate, even though every unit of currency deposited is earning exactly 6.5% p.a. for however long it's actually been in the account.

1. Expecting the quoted rate to equal the effective yield on total deposits. As explained above, the effective yield on your total invested amount is always somewhat below the quoted annual rate, because later installments earn interest for a shorter period — this is normal, not a bank error.

2. Missing installments repeatedly. Most banks charge a penalty for late installments, and missing several in a row can result in the account being closed before maturity — treat the monthly RD payment like a fixed bill, not a flexible savings top-up.

3. Ignoring TDS on RD interest (India). In India, RD interest is taxable, and banks may deduct TDS once interest earned crosses the prescribed threshold in a financial year — thresholds and rules can change, so check the latest figures on the Income Tax Department's site or with your bank before relying on the full quoted maturity amount for a specific goal. Depositors elsewhere should check their own country's tax treatment of deposit interest.

4. Choosing RD for a long-term goal where SIP would build more wealth. RD's certainty is valuable for near-term goals, but for a 10+ year goal, the generally fixed RD return usually falls well short of what an equity SIP has historically delivered over the same horizon.

5. Not comparing bank rates before committing. RD rates vary noticeably between PSU banks, private banks, and small finance banks for the same tenure — compare a few options before locking in, since you can't change the rate once the RD is booked.