RD Calculator — How Recurring Deposit Interest is Calculated in India
Learn how Indian banks calculate RD interest using quarterly compounding. Includes formula, worked examples, and RD vs FD vs SIP comparison table.
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
- Compare rates — small finance banks often offer 0.5-1% higher rates than large banks
- Senior citizen benefit — extra 0.25-0.50% rate available for 60+ age
- Choose the right tenure — rates peak at 1-2 year tenures for most banks
- Avoid premature withdrawal — penalty is typically 0.5-1% rate reduction
- 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.
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Tags: finance, RD, recurring deposit, india, banking
Last Updated: June 2026
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