RD Calculator — How Recurring Deposit Interest is Calculated in India

Introduction

A Recurring Deposit (RD) is one of the most popular savings instruments in India. It allows you to deposit a fixed amount every month for a fixed tenure, and earn interest that compounds quarterly. Unlike mutual funds, RD returns are guaranteed by the bank — making it ideal for risk-averse savers. But how exactly is RD interest calculated? Let’s break down the formula and see real numbers.

⚠️ Disclaimer: RD interest rates vary by bank and may change. Interest earned is taxable. Consult your bank for current rates.

How RD Interest Works in India

Indian banks calculate RD interest using quarterly compounding. This means interest is added to your balance every 3 months, and future interest is calculated on the new (higher) balance.

The key difference from simple interest: with quarterly compounding, you earn interest on previously earned interest every quarter.

The RD Maturity Formula

A = P × [(1 + r/n)^(n×t) – 1] / [1 – (1 + r/n)^(-1/3)]

A simplified approach: each monthly installment earns compound interest for its remaining tenure.

For each installment: Amount = P × (1 + r/4)^(4 × remaining_months/12)

Where:

• P = Monthly deposit amount
• r = Annual interest rate (decimal)
• n = Compounding frequency (4 for quarterly)
• t = Tenure in years

Worked Example: ₹5,000/month, 7% interest, 12 months

• Monthly deposit (P) = ₹5,000
• Annual rate (r) = 7% = 0.07
• Quarterly rate = 0.07/4 = 0.0175
• Tenure = 12 months

Each installment compounds quarterly for its remaining duration:

Month-wise Breakdown

Month	Deposit	Months Remaining	Quarters Compounding	Maturity Value
1	₹5,000	12	4	₹5,359
2	₹5,000	11	3.67	₹5,330
3	₹5,000	10	3.33	₹5,300
4	₹5,000	9	3	₹5,267
5	₹5,000	8	2.67	₹5,235
6	₹5,000	7	2.33	₹5,203
7	₹5,000	6	2	₹5,176
8	₹5,000	5	1.67	₹5,146
9	₹5,000	4	1.33	₹5,117
10	₹5,000	3	1	₹5,088
11	₹5,000	2	0.67	₹5,058
12	₹5,000	1	0.33	₹5,029

Total Deposited: ₹60,000 Maturity Value: ≈ ₹62,308 Interest Earned: ≈ ₹2,308

RD vs FD vs SIP Comparison

Feature	Recurring Deposit (RD)	Fixed Deposit (FD)	SIP (Mutual Fund)
Investment type	Monthly fixed	One-time lump sum	Monthly flexible
Returns	Guaranteed (6-7.5%)	Guaranteed (6-7.5%)	Market-linked (8-15%)
Compounding	Quarterly	Quarterly	Daily NAV-based
Risk level	Zero (bank-backed)	Zero (bank-backed)	Market risk
Premature withdrawal	Allowed (with penalty)	Allowed (with penalty)	Anytime (open-ended)
Tax on returns	TDS above ₹40,000/year	TDS above ₹40,000/year	LTCG/STCG applicable
Best for	Safe, disciplined saving	Lump sum parking	Wealth creation
Lock-in	Fixed tenure	Fixed tenure	No lock-in (except ELSS)
Insurance	DICGC up to ₹5 lakh	DICGC up to ₹5 lakh	No insurance

Tax on RD Interest

• RD interest is fully taxable as “Income from Other Sources”
• TDS is deducted if total interest across all FD/RD in a bank exceeds ₹40,000/year (₹50,000 for senior citizens)
• You can submit Form 15G/15H to avoid TDS if your total income is below taxable limit
• Interest is taxed at your income tax slab rate — not a flat rate

Tips for Maximizing RD Returns

1. Compare rates — small finance banks often offer 0.5-1% higher rates than large banks
2. Senior citizen benefit — extra 0.25-0.50% rate available for 60+ age
3. Choose the right tenure — rates peak at 1-2 year tenures for most banks
4. Avoid premature withdrawal — penalty is typically 0.5-1% rate reduction
5. Ladder your RDs — multiple RDs at different tenures improve liquidity

Frequently Asked Questions

What is the minimum amount for RD in India?

Most banks allow RD starting from ₹100/month (post offices) or ₹500/month (private banks). Some digital banks offer ₹1,000 minimum.

Can I change my RD monthly amount after opening?

No. Once opened, the monthly installment is fixed. If you want to save a different amount, you need to open a new RD.

What happens if I miss an RD installment?

Banks typically allow 1-2 missed payments with a small penalty (₹1-2 per ₹100 per month). Continuous defaults may lead to premature closure.

Is RD better than SIP for beginners?

RD is better if you want guaranteed returns and zero risk. SIP is better for long-term wealth creation (5+ years) where you can tolerate short-term volatility.

How is post office RD different from bank RD?

Post office RD offers sovereign guarantee (government-backed), slightly lower rates, and a fixed 5-year tenure. Bank RDs offer flexible tenures (6 months to 10 years) and often higher rates.

Related Calculators

• RD Calculator
• Compound Interest Calculator
• Simple Interest Calculator

Related Articles

• Compound Interest Formula
• Flat Rate vs Reducing Balance Interest
• Simple vs Compound Interest