Planning to invest in Post Office Fixed Deposit (FD) or Recurring Deposit (RD)? One of the biggest advantages of these schemes is that they are government-backed, meaning your money is safe while earning competitive returns. But before you invest, you need to know exactly how much interest you will earn and what your maturity amount will be.
This is where the Post Office FD & RD Calculator comes in. These free online tools help you calculate your returns instantly, so you can plan your investments wisely.
Here is a complete guide to Post Office FD and RD calculators, current interest rates, and how to calculate your monthly interest in 2026.
Understanding Post Office FD (Time Deposit)
Post Office Fixed Deposit, officially known as National Savings Time Deposit (TD), is a lump-sum investment scheme backed by the Government of India . You invest a fixed amount for a fixed tenure and earn guaranteed interest.
Key Features of Post Office FD
- Minimum Investment: ₹1,000 (in multiples of ₹100 thereafter)
- Maximum Investment: No upper limit
- Tenure Options: 1 year, 2 years, 3 years, and 5 years
- Interest Compounding: Quarterly
- Interest Payment: Paid annually (can be credited to your savings account)
- Government Backing: 100% sovereign guarantee
Current Post Office FD Interest Rates (October-December 2026)
The government reviews small savings rates every quarter. For the quarter ending December 31, 2026, the rates remain unchanged :
| Tenure | Interest Rate (p.a.) |
|---|---|
| 1 Year | 6.9% |
| 2 Years | 7.0% |
| 3 Years | 7.1% |
| 5 Years | 7.5% |
Note: The 5-year Post Office FD qualifies for tax deduction under Section 80C of the Income Tax Act under the old tax regime .
How Post Office FD Interest is Calculated
The interest on Post Office FD is compounded quarterly but paid annually . This means:
- If you invest ₹1,00,000 at 7.5% for 5 years, you earn approximately ₹7,710 per year as interest
- Total interest over 5 years: ₹38,550
- Maturity amount: ₹1,38,550
Important: Unlike bank FDs where interest compounds and reinvests automatically, Post Office FD pays interest out annually. If you want compounding benefits, you must manually reinvest the annual interest .
Understanding Post Office RD (Recurring Deposit)
Post Office Recurring Deposit is ideal for those who want to build savings through regular monthly deposits. You deposit a fixed amount every month for a fixed tenure and earn interest on the accumulated balance .
Key Features of Post Office RD
- Minimum Monthly Deposit: ₹100 (in multiples of ₹10)
- Maximum Monthly Deposit: No upper limit
- Tenure: 5 years (extendable by another 5 years)
- Interest Compounding: Quarterly
- Interest Rate: 6.7% p.a. (unchanged for October-December 2026)
- Government Backing: 100% sovereign guarantee
How Post Office RD Interest is Calculated
The RD calculator uses the future value formula, considering monthly deposits and quarterly compounding .
Example: If you deposit ₹5,000 per month for 5 years at 6.7% interest:
- Total Investment: ₹3,00,000
- Interest Earned: Approximately ₹58,000 (varies based on compounding)
- Maturity Value: Approximately ₹3,58,000
Quick Reference: For a ₹1,000 monthly deposit over 5 years at 6.7%, you would earn approximately ₹19,000 in interest, with a maturity value of around ₹79,000 .
Post Office FD & RD Calculators: How to Use Them
Several financial websites offer free Post Office FD Calculator and Post Office RD Calculator tools. Here is how they work:
Post Office FD Calculator
Inputs Required:
- Principal Amount: The lump sum you want to invest
- Tenure: 1, 2, 3, or 5 years
- Interest Rate: Auto-populated or manually entered
Outputs Provided:
- Total Interest Earned
- Maturity Amount
- Graphical representation of growth
Formula Used: M = P × (1 + r/4)^(n×4)
Where M = Maturity, P = Principal, r = Rate, n = Years
Post Office RD Calculator
Inputs Required:
- Monthly Deposit Amount
- Tenure: 5 years (fixed)
- Interest Rate: 6.7% (current)
Outputs Provided:
- Total Investment (monthly deposit × months)
- Interest Earned
- Maturity Value
Example Calculation (using Scripbox data):
- Monthly Deposit: ₹5,000
- Total Investment: ₹1,80,000 (over 36 months)
- Interest Rate: 6.70%
- Interest Earned: ₹19,122
- Maturity Value: ₹1,99,122
Post Office FD vs Bank FD: Why Choose Post Office?
Post Office deposits offer distinct advantages over bank FDs:
| Feature | Post Office FD | Bank FD |
|---|---|---|
| Government Backing | 100% sovereign guarantee | Insured up to ₹5 lakh (DICGC) |
| Interest Rate (5-year) | 7.5% | Typically lower; varies by bank |
| Minimum Deposit | ₹1,000 | Varies by bank |
| Tax Benefit (5-year) | Section 80C | Section 80C available |
| Premature Withdrawal | Penalty applies | Penalty varies |
Key Insight: While RBI has cut repo rates, leading to lower bank FD rates, Post Office rates have remained unchanged since January 2024 . This makes Post Office deposits more attractive in the current interest rate environment.
Strategic Tips for Maximising Post Office Returns
1. Ladder Your FDs
Instead of investing a large amount in a single FD, consider laddering across different tenures. This provides liquidity while earning competitive rates. For example, split ₹3 lakh into 1-year, 2-year, and 3-year FDs .
2. Reinvest FD Interest
Since Post Office FD pays interest annually (not compounded), you can reinvest the annual interest into another FD or RD to benefit from compounding .
3. Choose the Right Tenure
The 5-year FD offers the highest rate (7.5%) and qualifies for Section 80C tax benefits. If you don’t need the money for 5 years, this is the best option .
4. Use RD for Disciplined Saving
If you struggle to save a lump sum, RD forces monthly discipline. The 6.7% rate is competitive, and you can set up automatic transfers .
5. Avoid Premature Withdrawal
Post Office FD charges 2% below the applicable rate for premature closure after 1 year. The 5-year FD cannot be closed before 4 years . Plan your tenure carefully.
Frequently Asked Questions
What is the current Post Office FD interest rate in 2026?
The current rates (October-December 2026) are: 1-year: 6.9%, 2-year: 7.0%, 3-year: 7.1%, and 5-year: 7.5% .
What is the Post Office RD interest rate?
The Post Office RD offers 6.7% per annum, compounded quarterly. This rate has remained unchanged for the October-December 2026 quarter .
How is monthly interest calculated in Post Office FD?
Post Office FD interest is compounded quarterly but paid annually. For ₹10,000 invested at 7.5%, you earn ₹771 per year as interest .
Can I use a Post Office FD calculator online?
Yes. Several financial websites offer free Post Office FD Calculator and RD Calculator tools. You can input your amount, tenure, and rate to get instant maturity values .
Is Post Office FD better than bank FD?
Post Office FD offers higher rates (7.5% for 5 years) compared to most bank FDs, plus 100% government backing. However, bank FDs may offer more flexible tenures and easier premature withdrawal .
What is the minimum amount for Post Office RD?
The minimum monthly deposit for Post Office RD is ₹100, in multiples of ₹10. There is no maximum limit .
Conclusion
The Post Office FD & RD Calculator is an essential tool for anyone planning to invest in these government-backed schemes. With Post Office FD rates ranging from 6.9% to 7.5% and RD offering 6.7%, these schemes provide competitive, safe returns — especially when bank FD rates are falling.
Use the calculators to estimate your returns, choose the right tenure, and plan your investments strategically. Whether you want a lump-sum FD or a disciplined monthly RD, Post Office schemes offer safety, simplicity, and sovereign guarantee.
Stay updated with quarterly rate revisions on the official India Post website at indiapost.gov.in.