Sensex, Nifty Fall Today: What Is Driving the Market Sell-Off?

Indian equities came under heavy selling pressure on September 28. By late morning, the Sensex had touched an intraday low of 72,855.76, about 1,040 points or 1.4% below Friday's close, while the Nifty 50 had fallen to 22,819.65, down roughly 321 points or 1.4%. These are intraday levels, not closing figures. Brent crude was trading around $106.7 per barrel during the morning session.

Crude is the most visible immediate pressure, but today's decline is not just an oil story. The US 10-year Treasury yield ended September 25 at 5.17% and Indian equities had already completed seven consecutive losing weeks before Monday's session.

A useful way to understand the current correction is to separate the two forces acting on stock prices. A company's share price ultimately depends on the earnings investors expect it to generate and the valuation multiple they are willing to pay for those earnings. Expensive crude can weaken the earnings side of that equation, while high global bond yields can reduce the valuation multiple.

The key question is therefore no longer simply why the Sensex and Nifty are falling today. It is whether the market is still repricing risk and valuations or whether these macro pressures are beginning to develop into a broader earnings downgrade cycle.

Why Are Sensex and Nifty Falling Today?

Oil prices have risen sharply over the past month. US Energy Information Administration data show Brent spot crude at $89.75 per barrel on August 28 and $114.89 on September 22, an increase of about 28%. Brent had retreated from that recent spike by September 28, but morning futures prices around 106.5 - 106.7 still left oil firmly above $100.

At the same time, the cost of global capital has increased. Official US Treasury data show the 10-year yield moving from 4.96% on September 22 to 5.11% on September 23, 5.18% on September 24 and 5.17% on September 25.

These pressures hurt Indian equities through different channels. Sustained expensive oil can increase import costs, inflation risks and input expenses for companies. Higher Treasury yields increase the return available on relatively low-risk US government debt and can make investors demand a higher return before holding equities and emerging-market assets.

That distinction matters. Crude can threaten future earnings, while high bond yields can reduce what investors are willing to pay for those earnings. Today's sell-off is occurring because both risks are present at the same time and because the market was already weakening before the latest oil move.

Why $100-Plus Crude Is a Bigger Problem for India Than the Headline Price Suggests

India's exposure to crude is unusually important because roughly 88.2% of its crude-oil requirement was met through imports in FY2024-25. PPAC data show that India imported around 242.4 million metric tonnes of crude during the year at a cost of approximately $137 billion.

The scale becomes clearer when the import volume is converted into barrels. The International Energy Agency uses a standard average conversion factor of 7.37 barrels per metric tonne for crude oil. On that basis, India's FY2024-25 imports were equivalent to roughly 1.79 billion barrels.

If the average price India paid for those barrels were $10 higher while import volumes remained unchanged, the gross annual import cost would be about $17.9 billion higher, equivalent to roughly 13% of the FY2024-25 crude import bill.

This is an illustrative sensitivity calculation, not a forecast. The actual bill depends on the Indian crude basket, sourcing discounts, freight, exchange rates, refinery requirements and changes in import volumes. But it shows why the duration of expensive crude matters much more to India than whether Brent moves two or three dollars on a particular trading day.

Investors looking at the broader transmission can also see how higher crude affects Indian markets. Higher import costs can increase demand for dollars and put pressure on the rupee. The currency opened around ₹95.88 per dollar on September 28 versus about ₹95.81 in the previous session, meaning a weaker rupee can make the same dollar-priced barrel even more expensive in domestic currency terms.

Inflation is the next channel. RBI research estimates that a 10% increase in global crude prices could raise India's headline inflation by around 20 basis points. That is not a mechanical rule: the eventual impact depends on the exchange rate, taxation, retail fuel pricing, government intervention and how much of higher costs companies pass on to customers.

March 2026 provides a useful example. The government reduced excise duty on petrol and diesel by ₹10 per litre when crude prices surged, but retail pump prices were kept unchanged. The duty reduction instead helped absorb part of the cost shock and reduced under-recoveries at public-sector oil marketing companies. This shows why a rise in global crude does not automatically translate one-for-one into Indian fuel prices or inflation.

High import dependence also should not be confused with an immediate physical shortage of oil. In May 2026, the government said India had around 60 days of crude-oil rolling stock. That was the position reported at the time, not a September inventory figure, but it illustrates the distinction between energy availability risk and energy price risk. For equities today, the latter is the more immediate concern.

Why US Treasury Yields Above 5% Are Pressuring Indian Stock Valuations

Oil primarily creates a potential earnings problem. Treasury yields create a valuation problem even before earnings change.

The rise in the official US 10-year Treasury yield from 4.96% on September 22 to 5.17% by September 25 means investors can earn more than 5% on a benchmark US government security. When the return available from a relatively low-risk asset rises, investors generally require a higher prospective return before accepting the additional uncertainty of equities, currency movements and emerging markets.

A simple present-value example shows why this matters. Suppose an investor expects to receive ₹100 ten years from now. If the required return is 10%, that future ₹100 is worth approximately ₹38.55 today. At an 11% required return, the same ₹100 is worth only around ₹35.22 today.

That is an 8.6% fall in present value without any change in the future cash flow itself. It does not mean the Nifty should fall 8.6% because interest rates rise; it simply illustrates how a higher discount rate can reduce the price investors are willing to pay today for the same future earnings.

This is why even fundamentally healthy businesses can see their valuations contract when global bond yields rise sharply. The effect can be particularly important for expensive stocks whose current prices depend heavily on profits expected many years into the future.

Sensex and Nifty Were Already Correcting Before the Latest Oil Shock

September 28 did not begin a market correction that did not previously exist.

On August 25, the Nifty closed at 24,334.55. By September 25, it had fallen to 23,140.50, a date-to-date decline of approximately 4.91%. The Sensex moved from 77,656.09 to 73,895.74 over the same period, a decline of around 4.84%.

Both indices had also ended lower for seven consecutive weeks through September 25. The broader correction can be tracked across Indian stock market indices, because the effect of weaker risk appetite can differ significantly between large caps, mid caps, small caps and individual sectors.

Foreign investor flows add another layer, although they should be interpreted carefully. Exchange-provisional data showed foreign institutional investors were net sellers of about ₹3,693.93 crore on September 25. Higher US yields can make dollar assets relatively more attractive, while rupee weakness can reduce the dollar return earned by a foreign investor holding Indian shares.

But a mechanism that can lead to FPI selling is not the same as proof that FPIs caused every point of today's decline. NSE itself notes that daily FII/FPI trading data are provisional and can change following custodial confirmation. At the time of writing during the September 28 session, final data for the day were not yet available, so today's fall should not simply be attributed to a foreign-investor number that has not been confirmed.

The more defensible conclusion is that the latest crude shock is amplifying an existing correction rather than creating one from scratch.

Which Sectors Are Most Exposed to Expensive Crude?

The impact of higher oil varies considerably across businesses, so classifying every stock as an "oil loser" would be misleading.

For directly exposed companies, the crucial issue is pricing power. A company that can pass higher input costs to customers without hurting demand may protect margins much better than a company forced to absorb the increase.

Banks are the less obvious case. They do not consume crude as an important raw material, yet they can still be affected if expensive energy keeps inflation and interest rates higher, weakens consumer spending or eventually affects borrower cash flows and credit demand. High bond yields can also compress the valuations investors assign to financial companies.

Financial stocks are important benchmark constituents, so weakness in large lenders can have a disproportionately large effect on index movements. Investors can examine individual Sensex stocks rather than assuming that an oil-driven macro shock should only affect companies that physically consume crude.

Is This Still a Valuation Correction or Is It Becoming an Earnings Problem?

This is the most important distinction for investors.

Stage 1 is valuation compression. Investors become more risk-conscious and demand higher prospective returns. P/E multiples can fall even if corporate earnings expectations have barely changed. The sharp rise in US Treasury yields provides a clear mechanism for this part of the correction.

Stage 2 is earnings pressure. If oil stays expensive for long enough, companies with high fuel or crude-linked input costs can face weaker margins. Consumers may also have less disposable income, affecting discretionary demand, while higher inflation can keep financial conditions tighter.

Stage 3 is an earnings downgrade cycle. This is when the macro risk begins appearing in numbers: management teams cut margin expectations, analysts reduce forward EPS forecasts, cash-flow assumptions weaken and downgrades spread beyond a handful of directly exposed sectors.

Stage 4 is the most difficult combination. Expected earnings decline at the same time as investors are willing to pay a lower valuation multiple for those earnings. A market facing both pressures can experience much deeper fundamental stress than one undergoing valuation compression alone.

Today's falling indices do not by themselves prove that India's corporate earnings cycle has entered Stage 3 or Stage 4. What can be said more confidently is that valuations are being challenged by a higher global cost of capital and that sustained expensive oil creates a credible risk to future earnings.

That is why the next phase of this correction cannot be judged only from Sensex points or Nifty support levels. Broad-based EPS revisions will provide much stronger evidence of whether the correction is moving from repricing risk to repricing corporate profitability.

What Should Investors Watch Next?

Five variables matter most from here. Brent crude will show whether India's energy shock is fading or persisting, while the US 10-year Treasury yield will indicate whether global valuation pressure is easing. USD/INR matters because currency weakness can amplify India's imported energy cost, and FPI flows can show whether foreign risk appetite towards India is stabilising.

The fifth variable is the most important: corporate earnings and forward EPS revisions. If crude remains elevated but companies continue to protect margins, demand and profit expectations, a meaningful part of the market weakness may remain a valuation and risk-premium reset. If analysts begin cutting earnings estimates broadly across sectors, the fundamental case behind the correction becomes considerably stronger.

Investors therefore do not need to predict the precise market bottom to understand what is changing. They need to watch whether the variables currently creating fear begin affecting the profits that ultimately support stock prices.

Today's Sensex and Nifty sell-off has genuine macro foundations. Higher crude raises risks to India's import bill, inflation and corporate earnings, while US Treasury yields above 5% reduce the valuation investors may be prepared to assign to those earnings.

For now, the evidence supports treating the correction as a combination of valuation repricing and rising earnings risk rather than proof of a broad earnings breakdown. The more important test will come if expensive energy and high global rates persist long enough to trigger widespread margin pressure, weaker cash flows and forward EPS downgrades.