Introduction
A falling rupee should not be just a headline news for us (investors). Why? Because it changes how every Indian saves, spends, and invests.
When the rupee loses value year after year, it quietly eats into our future purchasing power.
The biggest problem is that most traditional investments, FDs, Indian equity funds, real estate, are all rupee-denominated. They rise and fall within the same currency that is weakening. So the net return (after factoring in the weakening Rupee, is much lower than we think.
This is why more Indian investors today ask a simple but important question: How do I protect the value of my money when my currency keeps losing strength?
If the rupee keeps sliding from 60 to 70 to 80, and now close to 90 to a dollar, what can a normal retail investor do?
The usual answers, gold, NRI deposits, global diversification, come up as a logic next step. But few people understand the mechanics behind them.
In this post, I want to explore a route that many Indian investors still overlook: investing in an S&P 500 ETF FoF in India. It is those investors who are really worried about the continously weakining Indian Rupee.
Such ETFs are accessible for an Indian investors.
But to explain the utility of S&P 500 ETF FoF I’ll use cash-flow logic. This way, we can realise why it works so well in a weakening-rupee environment.
Finally, I’ll also talk about gold and we’ll see which is better, gold or S&P 500 ETF FoF as a rupee hedges.
Table of Contents
1. Why the Rupee Keeps Losing Value
The rupee doesn’t fall overnight. It weakens gradually over many years.
Imports are one big reason. India imports oil, electronics, and critical inputs. India needs dollars to pay for these imports. When import demand is high, the India has to buy more dollars in the global market. This consistent demand for dollars pushes the rupee lower over time.
This is not the case only with India, all countries have this concept. This is the reason why the USD (dollar) is always in demand.
Hence, when global conditions shift (like crude pirce rise due to way), currencies of emerging markets tend to fall faster than developed ones.
But the problem is not a single year of weakness of Indian Rupee. The problem is the slow and steady long-term decline.
Over the last decade, the rupee has fallen roughly 35% against the dollar (from 66 to 89). So what is the harm for us due to a weak currency (INR)?
That means the same 1 lakh in rupees today buys much less internationally than it did ten years ago.
So the question becomes simple: Should we keep our full savings tied to a currency that keeps losing value?
Investors who travel across the world more, understand this, and shifts a portion of their savings into assets that are priced in stronger currencies.
That is where the S&P 500 (and gold) comes in.
2. Why S&P 500 Exposure Helps in a Weakening Rupee Scenario
The S&P 500 represents the top 500 U.S. companies.
The Apple, Microsoft, Google, Amazon, etc companies are included in this index.
These are such businesses that earn globally and dominate their industries.
When we invest in an Indian S&P 500 ETF (FoF), our investment is actually buying U.S. equities that are priced in dollars. There are two Indian fund houses that gives us the exposure to S&P 500 Index:
When Indian investors invests in such an ETF, they get two engines of growth.
- First engine: Growth of U.S. businesses: Over long periods, the S&P 500 has delivered around 10–12% CAGR in USD terms. American companies tend to grow faster, scale globally, and reinvest heavily in innovation.
- Second engine: Rupee depreciation: If the rupee weakens from 66 to 89 per dollar (in lat 10-Yr), your investment automatically becomes more valuable in INR. This happens even if the U.S. market stayed flat. This currency gain compounds along with the equity return.
It’s this dual effect that makes S&P 500 exposure so powerful for an Indian investor.
3. Cash-Flow – Net gain explained due to Rupee depreciation
In this example, I’ll take a real ETF to highlight how investing in S&P 500 index is beneficial when INR is depreciating so fast.
Motilal Oswal S&P 500 Index Fund (launched in 2020). Its 5-year returns hover around ~16.97% CAGR in INR, depending on the exact period.
But that number on its own doesn’t tell the full story. Why? Because it mixes two different components: (a) U.S. market growth and (b) Rupee depreciation.
So, weu need to separate them to understand what actually drove the gains.
Let’s decipher how much return is contributed by the S&P500 growth and how much is due to the weakening Indian Rupee.
- Step 1: Initial Investment:
- Assume you invested Rs. 1,00,000 five years ago. At that time, the USD/INR rate was roughly Rs. 70/USD. This means your investment effectively bought $1,428 (100000/70) worth of S&P 500 stocks. But it is important to note that this conversion (INR to USD) is handled inside the fund. We as investors would never touch the dollar ourself.
- Step 2: U.S. Market Growth in 5 Years:
- Over the last five years, the S&P 500 grows by roughly 13% CAGR in USD. So, this way our $1,428 becomes $2,628 [= $1,428 × (1.13)^5].
- Step 3: Rupee Depreciation Over 5 Years:
- In the same 5 years, the rupee moved from around Rs. 70/USD to roughly Rs. 85/USD (net). This is equivalent to about 20% depreciation in 5 years. This is an important detail because when the fund house will converts our holdings to INR, new exchange rate of 85 will be applicable (weaker Rupee).
- Step 4: Final Value in INR Today:
- What is the current value of the investment in INR terms? $2,628 × 85 = Rs. 2,23,380
- Step 5: Net Return (CAGR in 5 Years):
- Your original Rs. 1,00,000 has become Rs. 2.23 lakhs in 5 years. In this time horizon it has almost doubled. In CAGR terms, it means your INR investment has appreciated at a rate of 17.4% CAGR.
So you can see, this return number actually aligns with the actual returns of the ETF’s numbers.
| Motilal Oswal S&P 500 Index Fund | Return Calculation as per Cash Flows (Step 1 to 5) | |
| NAV (2020) / Initial Investment | Rs. 12.25 | Rs. 1,00,000 |
| NAV (2025) / Final Corpus | Rs. 26.75 | Rs. 2,23,380 |
| Return (CAGR in 5 Years) | 16.97% (~17%) | 17.4% (~17%) |
What Actually Drove These Returns?
The beauty lies in realizing the split between how much is contributed by the S&P 500 growth and how much is due to the Rupee devaluation.
- Market return from S&P 500 Growth: ~80% of total gain (13.1% per annum)
- Rupee depreciation: ~20% of total gain (3.9% per annum)
- Total return: ~100% (17%) over 5 years
Even if the S&P 500 had delivered only average returns, the weakening rupee would still fetched us 3.9% return. This is an amazing realization, right?
Just for your information, in the same period when Motilal Oswal S&P 500 Index Fund has yielded ~17% CAGR, Mirae Asset S&P 500 Top 50 ETF has yielded ~19% CAGR (Since 21-Sep-2021).
This is why, for an investor who wants to protect his funds from falling Rupee, S&P 500 feeder fund becomes a natural choice.
Such mutual funds becomes an automatic hedge against a falling rupee.
Your asset earns in dollars while we live in rupees. And that difference works in our favour (see the above calculation).
4. How Does Gold Compare to S&P 500 Index (or ETF) as a Rupee Hedge?
For majority Indian investors, whose focus is on weak Indian Rupee, gold has been a traditional hedge. Why?
Because it is globally priced in USD. This is why it naturally rises in INR terms when the rupee weakens.
Every major period of rupee depreciation shows this pattern.
But it is also important to note that gold behaves very differently from U.S. equities.
- Gold depends heavily on long cycles: There are long periods where gold goes sideways. This is especially true when interest rates are rising globally. But in crises like that of COVID crisis, inflation spikes, geopolitical tension, gold jumps quickly.
- Gold is a hedge, not a growth engine: In USD terms, gold has historically given around 6% CAGR over long periods. The rupee weakening adds another 4% for Indian investors. So long-term INR returns are generally in the tune of 9-10% range.
How gold compares with S&P 500 in INR terms
Over the last five years:
| S&P 500 Index Fund (FoF) | Gold (SGBs or ETFs) |
| 17% CAGR in INR | 12% CAGR in INR (last five years) 10% (generally) |
Gold protects capital well, but it is not designed to grow aggressively as equity (S&P 500). Equity grows faster because businesses grow and the currency advantage stacks on top of it.
- When gold works better: Gold shines during deep uncertainty. It acts like insurance. It rarely crashes like equities do.
- When S&P 500 works better: Most normal years favour the S&P 500 because strong companies compound earnings. And a weakening rupee simply turbocharges the INR returns.
If you want stability, gold is a better choice. But, i your priority is long-term wealth creation plus currency protection, S&P 500 looks like a better bet.
Both gold and the S&P 500 can protect you against a falling rupee.
But they have their own reasons (different) to do so.
- Gold offers stability in troubled years. It holds its ground when everything else feels chaotic.
- But if the idea is to beat currency weakness and grow your wealth meaningfully, S&P 500 has historically done a superior job.
Conclusion
A weakening rupee effects our investment in a subtle ways.
It doesn’t harm us all at once, but slowly and silently over years.
That’s why protecting the real value of our savings becomes essential.
The S&P 500, through a simple ETF feeder fund in India, helps us invest in a dollar-denominated growth engine. Check the cash flow calculations here to understand how such funds benefit Indian investors.
S&P 500 Index funds lets an Indian investor benefit from both the rise of global companies and the natural depreciation of the rupee.
Gold continues to have its place when looking at it from the stability (only as a Rupee hedge) perspective. But for someone whose priority is also growth, gold cannot match the long-term growth potential that U.S. equities offer.
Note: Indian equity mutual funds yields about 16-17% CAGR returns in a long term horizon. In the same period, S&P 500 index will grow only by about 13% per annum. But add to it the effect of Rupee depreciation (3.9% per annum) and what you get is a net return that matches Indian equity growth.
