NextFin News - The S&P 500 is bracing for a roughly 10% drawdown as the Federal Reserve prepares to raise interest rates, according to Dean Curnutt, founder and chief executive of Macro Risk Advisors (MRA). The warning lands as the benchmark trades near 7,630, down 0.35% on the session and about 1.5% over the past month, still holding an 11-12% year-to-date advance after touching an all-time high of 7,816.70 in August.
The forecast frames the central tension for Wall Street this week: after holding the federal funds rate at 3.50%-3.75% for the entire year, the Fed is widely expected to deliver a 25-basis-point increase at its September 15-16 meeting, and that shift from pause to tightening is colliding with a stock market that has priced in continued calm.
The Setup: A Market That Barely Blinked, Now Facing a Genuine Tightening Shock
For much of 2026, equities absorbed bad news without much damage. Tariffs, Middle East hostilities, oil spikes, and a stubbornly above-target inflation print failed to produce a sustained selloff. That calm is exactly what worries Curnutt. When investors stop hedging, the market's shock absorbers thin out — and a policy shift that would normally produce a manageable pullback can cascade into something deeper.
The immediate trigger is inflation that refuses to cooperate. The August consumer price index came in hotter than economists expected: core CPI, excluding food and energy, rose 0.3% month over month versus the 0.2% forecast, leaving the yearly core rate at 2.4% and headline inflation at 3.4%. That is inflation above the Fed's 2% target for five and a half years running, and it arrived alongside a stronger-than-expected producer price report and Brent crude surging past $100 a barrel on renewed Strait of Hormuz tensions.
The market repriced almost instantly. Traders in short-term interest-rate futures moved from pricing about a 70% chance of a quarter-point hike to roughly 85% ahead of the Fed's Wednesday decision. The 10-year Treasury yield climbed more than 2 basis points to around 5%, its highest level since October 2023, while the 2-year note yield advanced to 4.666%. Equity futures turned negative in early trading, with the S&P 500 down 0.75% and the Nasdaq 100 losing 1.17%, while the small-cap Russell 2000 bucked the trend with a 0.45% gain — a rotation signal that risk appetite was narrowing rather than collapsing outright.
Tech leadership also showed cracks. Nvidia fell 2.84% to $212.08 and other chip names weakened after Anthropic chief executive Dario Amodei published an essay urging the AI industry to slow the development of frontier models over safety concerns. Alphabet, by contrast, gained 3.07% to $348.90, underscoring how uneven the rotation has become: investors are not fleeing equities wholesale, but they are pruning the most crowded, rate-sensitive corners of the market.
Why a 10% Drawdown Is Not an Outlier Call
A 10% decline — the classic definition of a correction — is not a tail-risk forecast. It sits almost exactly on the historical average. Across 18 post-World War II tightening cycles compiled by Ned Davis Research, the S&P 500 has experienced maximum drawdowns averaging 12% within six months of the first rate hike and 14% within the first year. The index also gained an average of 18% in the year leading into the initial hike, meaning the setup heading into September 2026 — an 11-12% year-to-date advance — mirrors the typical pre-tightening strength that has historically preceded a correction.
The speed of tightening matters. Fast tightening cycles have produced average drawdowns of 16% by month 12, compared with 11% for slow cycles — a differential of more than 500 basis points. If the Fed moves more than once before year-end, as some economists now expect, the market would be entering the steeper-drawdown regime.
The 2022 episode offers a harsher comparison. That cycle delivered 425 basis points of hikes and a 28% S&P 500 drawdown — roughly 1.6% of index decline per 25 basis points of tightening. The 2018 cycle produced a nearly 20% drawdown on a 100-basis-point move, or about 5% per 25 basis points. Curnutt's 10% call implies something between those two worlds: a meaningful correction, but not a bear market — provided the Fed does not have to hike aggressively and repeatedly.
There is also a valuation arithmetic behind the call. With the 10-year Treasury yield back near 5%, the risk-free rate that anchors every discounted-cash-flow model has risen by roughly a full percentage point from the 4% zone that prevailed for much of the early-2020s easing period. Applied mechanically to a long-duration earnings stream, that alone justifies a high-single-digit compression in the multiple investors are willing to pay. A 10% index drawdown is what happens when that mechanical repricing meets crowded positioning.
The Mechanism: Why This Time the Transmission Runs Through Complacency, Not Just Discount Rates
The textbook channel is mechanical: higher rates raise the discount rate applied to future earnings, compressing valuations, especially for long-duration growth stocks. That channel is real, but it is not the whole story. The more dangerous transmission runs through positioning.
When volatility is suppressed and correlations stay low, investors sell puts, run leveraged long exposures, and under-hedge. The VIX closed the week of September 11 at 15.84 — down more than 11% on the day and well below its 52-week high of 35.30. That is not a market pricing in a 10% shock. It is a market pricing in continued calm.
Curnutt has flagged this dynamic before: in a positive-gamma regime, dealer hedging dampens price moves and reinforces stability, but the same structure amplifies losses once the market breaks the other way. Investors who sold puts at 20 implied volatility find themselves underwater on both delta and volatility when the market drops 10% in two days and the VIX jumps.
"That becomes an amplifier of the risk," Curnutt said.
The oil shock feeds directly into the rates story, compounding the problem.
"Friday's hotter CPI report pushed markets to price roughly an 85% probability of a 25-basis-point Fed hike on Wednesday, with another hike increasingly expected before year-end," said Daniela Hathorn, senior market analyst at Capital.com.
Energy-driven inflation is the worst kind for a central bank: it forces a choice between fighting price pressures and protecting growth, and it hits consumers through gasoline prices at the same time that higher mortgage rates squeeze household budgets.
The Second-Order Question Nobody Is Asking: Is the Hike Already the Easy Part?
The consensus view is straightforward: the Fed hikes, stocks wobble, and the question is how much. The second-order risk is different. If the Fed hikes into an economy where inflation is being driven by supply shocks — oil, or wireless services, which jumped 5.9% in August — then each rate increase does less to cool prices and more to damage demand. Policymakers then face a choice: declare victory after one hike, or keep tightening into a slowing labor market.
"Today's clean 0.3% core CPI print, combined with the sharp rise in energy prices and persistent tensions with Iran, all but locks in a Fed rate hike next week. After half a decade of above-target inflation, policymakers are likely to conclude that more than one hike will be needed to re-establish price stability," wrote Seema Shah, chief global strategist at Principal Asset Management.
That is the scenario in which Curnutt's 10% becomes a floor rather than a target. But it is not the base case, and it is already being contested. Omair Sharif of Inflation Insights noted that the core rate would have been far more modest without the extraordinary wireless-services spike, adding that he was not sure the Fed could play that game right now with odds of a hike pushing to the 90%-ish zone. In other words, the Fed may hike because the market expects it — not because the data demand a full campaign.
This is the expectation gap that matters most. A hike the market has already priced at 85% is unlikely to trigger a disorderly repricing on its own. The damage comes if the Fed's language or its economic projections imply that September is the beginning, not the end — because that is when the discount-rate math compounds and the positioning amplifier kicks in.
The Strongest Counter-Thesis: This Is a Cyclical Pullback, Not a Regime Break
The bear case for the bull market rests on one premise: that inflation has structurally reaccelerated and that the Fed must break something to contain it. The counter-thesis attacks that premise at its foundation.
First, the August core print was narrow. A 5.9% jump in wireless services is a single-category distortion, not broad-based reacceleration. Strip out the energy and wireless noise, and the underlying inflation trend is not screaming. Second, the Fed has already done a great deal of tightening through financial conditions: a 10-year yield near 5% and a 2-year near 4.67% have tightened conditions materially without a single FOMC vote. Third, corporate earnings remain strong — MRA's own September outlook cites strong profitability, healthy private-sector demand, and low layoffs as the fundamental foundation supporting markets, while listing renewed inflation, higher Treasury yields, geopolitical escalation, slowing employment, elevated valuations, and weaker consumer spending as the key risks.
"The renewed march higher in oil, gasoline and diesel prices add to concerns that higher energy prices could spill over to other goods and services and inflation expectations. As such we are now looking for the Fed to raise rates by 25 bps at next week's policy meeting," wrote Kathy Bostjancic, chief economist at Nationwide.
Note the framing: one hike, a response to energy spillover risk, not the opening of a multi-year campaign.
The valuation argument cuts both ways. Yes, equities are richly priced by conventional metrics, and the implied equity risk premium at the start of 2026 was only about 4.2% over Treasuries — thin compensation for risk. But a 10% correction on an index up 11-12% year-to-date would still leave the S&P 500 higher than it began the year. This is a cyclical mean-reversion within a bull market, not a structural break in the earnings regime.
What Would Prove the 10% Call Wrong
The falsifying signal is specific: if core CPI prints at or below 0.2% month over month for two consecutive months after the September hike, and the 10-year Treasury yield falls back below 4.5%, the structural-reacceleration thesis fails. In that scenario, the Fed's September move looks like a one-and-done insurance hike, positioning unwinds without cascading, and the S&P 500's drawdown stays in the mid-single digits.
Conversely, the signal that would make the 10% look conservative is equally clear: a second 25-basis-point hike priced before year-end, combined with Brent sustaining above $110 a barrel and core CPI holding at 0.3% or higher. That is the fast-tightening regime where the 16% historical average drawdown becomes the relevant benchmark.
What to Watch: Three Horizons
Short term (days to weeks): The September 15-16 FOMC decision and Chair Kevin Warsh's press conference. Warsh signaled at Jackson Hole that the Fed would act if he lacked confidence that inflation was moving toward 2% "clearly and at sufficient speed." The market will parse every word for whether this is one hike or a campaign. Oil is the wild card — Brent jumped more than 3% toward $106 last week after attacks on shipping in the Strait of Hormuz and a drone strike that prompted Saudi Arabia to temporarily shut its East-West pipeline.
Medium term (months): Earnings. The S&P 500 is entering this tightening episode with strong profitability, but higher rates and higher oil are a tax on margins. If third-quarter earnings hold up, the drawdown stays cyclical. If guidance cracks, the correction deepens.
Long term (years): The structural question is whether the low-inflation, low-rate regime that supported rich equity valuations since 2009 has ended. One data point does not answer that. But if inflation proves sticky above 3% while growth slows, the equity risk premium that looked thin at 4.2% will look generous in hindsight.
Conclusion
Curnutt's 10% call is best read as a positioning warning, not a prophecy. The market has spent months in a positive-gamma, low-volatility regime that rewarded complacency. A Fed that shifts from pause to hike removes the policy put that underpinned that regime, and history suggests a 10-14% drawdown is the normal price of that transition — not a disaster, but a reset.
The base case is a cyclical correction that leaves the bull market intact: one 25-basis-point hike in September, another possibly before year-end, and an S&P 500 that gives back part of its year-to-date advance before finding support. The downside case — multiple hikes into reaccelerating inflation — is where 10% becomes a floor. The upside case — a one-and-done hike with cooling core prints — would leave the 10% call looking like a false alarm.
Markets do not get hurt by rate hikes; they get hurt by rate hikes they did not hedge for. After a year of absorbing shocks without flinching, the S&P 500 entered this week with the VIX near 16 and investors positioned for calm. That is the real amplifier — and it is already in place.
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