SIP Calculator with Inflation Adjustment

SIP Calculator with Inflation — See the Real Value of Your Mutual Fund Corpus

In one line: an inflation-adjusted SIP calculator estimates your mutual fund maturity amount and then discounts it by an assumed inflation rate to show what that money will actually buy in today's rupees — the real value, not just the headline number. This free tool does exactly that, instantly, with a year-by-year table and an inflation-erosion breakdown, entirely in your browser.

Last updated: August 2026 · Real-value formula verified against the standard present-value discounting method.

Why most SIP calculators mislead you

Open almost any bank or fund-house SIP calculator and it will proudly show you a big maturity number — ₹1 crore, ₹2 crore, whatever your inputs produce. What it quietly leaves out is that a rupee twenty years from now buys far less than a rupee today. Inflation is the silent tax on every long-term investment, and ignoring it is the single most common planning mistake Indian investors make. A corpus that looks life-changing on screen can be merely comfortable once you account for the rising cost of living. This calculator refuses to hide that: it puts the inflation-adjusted real value right next to the nominal corpus so you plan with the honest number.

How inflation affects SIP returns — a worked example

Take a ₹10,000 monthly SIP at a 12% expected annual return for 20 years. The nominal maturity corpus works out to roughly ₹1 crore. That is the figure a typical calculator stops at. But apply 6% average inflation over those same 20 years and the real value — what ₹1 crore will actually purchase in 2046 — is only about ₹31 lakh in today's money. You have not lost any rupees; the rupees have simply lost about two-thirds of their purchasing power. The corpus is still a genuinely good outcome, but knowing it is worth ₹31 lakh in real terms rather than ₹1 crore changes how much you need to invest to fund a real-world goal like retirement or a child's education.

Nominal return vs real return

The return rate you enter (say 12%) is a nominal return. Your real return is roughly the nominal return minus inflation. At 12% nominal and 6% inflation, your real return is close to 5.7% a year, not 12% — because the formula is (1 + nominal) ÷ (1 + inflation) − 1, not a simple subtraction. Over one year the difference looks small; over 25 or 30 years the gap between "growing at 12%" and "growing at 5.7% in real terms" is enormous. Planning against the real return is what separates a corpus that keeps its promise from one that quietly disappoints.

How to inflation-adjust your SIP goal

If your goal is "₹1 crore for retirement," decide first whether you mean ₹1 crore in today's money or ₹1 crore in future rupees. If you mean today's purchasing power, you must aim for a much larger nominal corpus. A useful rule of thumb: at 6% inflation, money halves in purchasing power about every 12 years. So a goal worth ₹1 crore today needs a nominal corpus of roughly ₹2 crore in 12 years, or about ₹3.2 crore in 20 years, to preserve the same real value. Use the inflation slider in this calculator to model your own assumption and read the real-value figure directly.

Step-up SIP is partly an inflation defence

A flat SIP quietly shrinks in real terms every year — ₹10,000 invested in year one is worth less, in purchasing power, than ₹10,000 invested in year ten. A step-up SIP, which raises your contribution by a fixed percentage annually (usually in line with salary hikes), directly counters this. Setting the step-up close to your expected inflation rate keeps your investing power roughly constant in real terms, and because each year's increase compounds for all the remaining years, it also lifts the final corpus substantially. A ₹10,000 SIP at 12% for 20 years reaches about ₹1 crore flat, but crosses ₹1.9 crore with a 10% annual step-up. Model this with the Step-up field above.

What inflation rate should you assume for India?

India's long-run consumer price inflation has generally sat in the 5–7% range, though individual categories vary — education and healthcare costs have often risen faster than the headline CPI, while electronics have fallen. For conservative long-term planning, 6% is a sensible default and is what this calculator uses out of the box. If your goal is education or healthcare heavy, modelling 7–8% is prudent. The inflation-erosion table above lets you see the real value at 4%, 5%, 6%, 7% and 8% side by side for your exact corpus and tenure, so you can plan for a range rather than betting on a single number.

The SIP formula and the real-value formula

The nominal SIP maturity is calculated month by month as an annuity-due: each contribution grows at the monthly return rate (annual return ÷ 12) for the remaining months. With a step-up, the monthly contribution rises each year before compounding continues. The inflation adjustment is then a straightforward present-value discount: real value = nominal corpus ÷ (1 + inflation rate)^years. Every figure this tool shows traces to these two formulas and the assumptions you enter — there are no invented scores or hidden fudge factors, and all computation happens locally in your browser so none of your numbers leave your device.

SIP vs fixed deposit, after inflation

Fixed deposits in India currently offer roughly 6.5–7.5%. After 6% inflation, an FD's real return is close to zero or even slightly negative once tax on interest is applied — your money is barely keeping pace with rising prices. A long-term equity SIP at a 12% nominal return still delivers a meaningful real return of around 5–6% after inflation. This is the core case for equity SIPs over FDs for goals seven or more years away: FDs protect nominal capital but often fail to protect purchasing power, while equity SIPs accept short-term volatility in exchange for real growth. Match the instrument to the goal — FDs for short-term certainty, inflation-beating SIPs for long-term wealth.

SIP, inflation and tax — the second haircut on your real return

Inflation is the first thing that shrinks your corpus; tax is the second, and most calculators ignore both. This tool shows your pre-tax nominal corpus and its inflation-adjusted real value — but when you actually redeem an equity mutual fund, capital-gains tax takes another slice. For equity-oriented funds (65%+ in Indian equity), gains are taxed under the Finance (No. 2) Act, 2024 — effective 23 July 2024 and left unchanged for FY 2026-27: long-term gains on units held over 12 months are taxed at 12.5% on the amount above a ₹1.25 lakh annual exemption (Section 112A, no indexation), and short-term gains on units held 12 months or less at 20% (Section 111A).

Here is what that does to the ₹10,000/month, 12%, 20-year example. The nominal corpus is about ₹1 crore, of which roughly ₹76 lakh is gain (you invested ₹24 lakh). If you redeemed the whole thing in a single financial year, LTCG tax would be about 12.5% × (₹76 lakh − ₹1.25 lakh) ≈ ₹9.3 lakh, leaving around ₹90 lakh. Because a SIP builds units with staggered purchase dates — taxed on a FIFO basis — redeeming gradually over several years lets you use the ₹1.25 lakh exemption again each year and trims the bill further. Either way, stack that tax on top of 6% inflation and your post-tax, inflation-adjusted value lands below the ₹31 lakh real figure the calculator shows before tax. That gap is precisely why planning against the headline maturity number overstates what you will really be able to spend.

Tax figures reflect the Income-tax Act, 1961 as amended by the Finance (No. 2) Act, 2024 (Sections 112A and 111A), verified against incometaxindia.gov.in. Exact tax depends on your redemption schedule and total equity gains in the year — this is an illustration, not tax advice.

Frequently Asked Questions

How does inflation affect SIP returns?

Inflation does not change how many rupees your SIP grows to, but it reduces what those rupees can buy. At 6% inflation, a ₹1 crore corpus in 20 years has the purchasing power of about ₹31 lakh today. This calculator shows both the nominal corpus and the inflation-adjusted real value so you can plan against the honest figure.

What is the real return on a 12% SIP after inflation?

At 12% nominal return and 6% inflation, the real return is about 5.7% per year, calculated as (1.12 ÷ 1.06) − 1, not a simple 12% − 6%. Over long tenures this real return is what actually determines whether your corpus meets a real-world goal.

What inflation rate should I use in an SIP calculator?

For long-term planning in India, 6% is a reasonable default. If your goal is dominated by education or healthcare costs, which have historically risen faster, consider 7–8%. The inflation-erosion table lets you compare 4% to 8% at once for your own inputs.

How much SIP do I need to reach ₹1 crore?

At 12% annual return: about ₹43,000/month over 10 years, ₹19,800/month over 15 years, ₹10,000/month over 20 years, or ₹5,300/month over 25 years. If you want ₹1 crore in today's purchasing power rather than future rupees, you need to target a larger nominal corpus — use the inflation slider to see the real value.

Is this inflation SIP calculator free?

Yes, completely free with no registration. It shows the nominal corpus, total invested, total gains, the inflation-adjusted real value, a year-by-year table, and an inflation-erosion breakdown — all instantly and entirely in your browser.

Does a step-up SIP beat inflation?

Setting your annual step-up close to the inflation rate keeps your contribution roughly constant in real purchasing power, so your investing does not quietly shrink over time. It also raises your final corpus significantly because each increase compounds for all remaining years.

Does this SIP calculator account for tax?

No — it shows the pre-tax nominal corpus and the inflation-adjusted real value. Equity fund gains are taxed separately when you redeem: 12.5% long-term on gains above a ₹1.25 lakh yearly exemption (Section 112A) and 20% short-term (Section 111A). Because a SIP redeems units with staggered holding periods, your actual tax depends on when you sell, so the real post-tax outcome is best estimated at redemption rather than baked into the projection.