Simulation guide · India · Supports the FD Tax Calculator
How to Simulate FD Interest Tax & Inflation (Worked Example)
This page is a number walkthrough, not the live tool. Use it to understand the sequence — then run your own deposit in the FD Tax Calculator.
Primary tool: FD Tax Calculator — tax on interest, post-tax maturity, inflation · Related: why headline rates mislead · RD calculator
Disclaimer: Illustrative math only. Slabs, cess, and TDS thresholds change — verify with a CA before filing.
What you will simulate (3 numbers)
- Bank maturity — what the passbook shows (pre-tax).
- After-tax maturity — interest reduced by your slab.
- Today’s rupees — same corpus after inflation (purchasing power).
Search queries like “fd tax calculator” and “tax on fd interest calculator” are best served by the live FD Tax Calculator. This guide shows the same three-step sequence with fixed example numbers.
Worked simulation: ₹5 lakh · 7% · 5 years · 30% slab
Assume a cumulative bank FD at ~7% p.a. (your bank rate will differ). Approximate outcomes:
| Step | What to read | Approx. figure |
|---|---|---|
| 1. Deposit | Principal you lock | ₹5,00,000 |
| 2. Pre-tax maturity | Bank / brochure number | ~₹7.0L (interest ~₹2.0L) |
| 3. Tax on interest @30% | Slab drag on interest only | ~₹60,000 tax |
| 4. Post-tax you keep | Maturity after tax on interest | ~₹6.4L |
| 5. At 6% inflation | Purchasing power of that corpus | Feels closer to ~₹4.8L today |
Run it live: Open the FD Tax Calculator. Set amount ₹5,00,000, rate 7%, tenure 5 years. Keep Apply tax on at 30% slab and Apply inflation at 6%. Read You Keep After Tax, then the return ladder: Bank → After tax → Real.
Same deposit, three slabs (compare the tax drag)
Interest is taxable at your marginal slab. Holding rate and tenure fixed, only the slab changes the “after tax” step:
| Slab on interest | Approx. tax on ~₹2L interest | What to do in the calculator |
|---|---|---|
| 10% | ~₹20,000 | Set tax slab to 10% · Apply tax on |
| 20% | ~₹40,000 | Set tax slab to 20% · Apply tax on |
| 30% | ~₹60,000 | Set tax slab to 30% · Apply tax on |
Flip the slab slider once — do not re-enter the deposit. That is the point of a tax-aware tool. Use the FD Tax Calculator for live slab flips.
Add inflation (the second toggle)
Queries like “fd calculator with inflation” want purchasing power, not another brochure rate. After tax is on:
- Set inflation to 5%, then 6%, then 7%.
- Watch the Real step on the ladder and “in today’s money”.
- If real return turns near zero or negative, the FD is a parking tool — not a wealth tool — for that horizon.
Pair with the conceptual guide: why the headline FD rate is not your real return.
5-minute checklist (do this in the FD Tax Calculator)
- Open the FD Tax Calculator.
- Enter your real deposit, rate from the bank rate card, and tenure.
- Confirm Apply tax is on · set your slab — read You Keep After Tax.
- Open Tax slab & inflation if you need to change assumptions.
- Turn on Apply inflation · set a CPI guess (5–7%).
- Read Bank → After tax → Real. Decide only after that third number.
Tax-saving FD note (80C)
“Tax saving FD calculator” searches often mean 5-year tax-saver FDs under Section 80C. Those get a deduction on the deposit (within the ₹1.5L 80C ceiling), but interest is still taxable at slab. Simulate the interest tax the same way — do not treat the 80C lock-in as tax-free interest like PPF.
For 80C trade-offs with equity, see PPF vs ELSS for 80C.
Frequently asked questions
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How do I calculate tax on FD interest in India?
Interest = maturity − principal. Tax ≈ interest × your slab. Use the FD Tax Calculator with Apply tax on so you do not hand-calc compounding.
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Where should I run an FD tax calculator?
On the FD Tax Calculator page — that is the live tool for post-tax maturity and inflation. This article is supporting content with a fixed worked example.
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What inputs do I need?
Amount, rate, tenure, slab, and (optional) inflation %. That is the full simulation set.