There is already broad consensus in the market that the Federal Reserve will raise interest rates next week, but the question truly weighing on investors' minds is how far this tightening cycle will go, and where the sustained policy squeeze will create the most pressure across markets.

According to projections from BMO Capital Markets, Ian Lyngen, head of US interest rate strategy, expects the Fed to deliver a 25-basis-point hike this month, followed by additional increases at the October and December meetings. That scenario implies three consecutive hikes that would push the federal funds rate target range back to between 4.25% and 4.5%, effectively undoing the rate cuts overseen by former Fed Chair Powell in 2025. Josh Hirt, senior US economist at Vanguard, said three hikes represent a "pretty reasonable starting point" for assessing the Fed's path, though he noted the plausible range spans anywhere from one to six increases.

On the vulnerability front, analysts have identified two major risk exposures: the optimism powering the artificial intelligence spending boom, and the insurance industry's heavy allocation to private credit. At the same time, concerns are building over the widening US fiscal deficit, with some warning that a move above 5% on the 10-year Treasury yield could trigger a fresh wave of selling pressure.

The case for three straight hikes and what history suggests

Economists generally point out that the Fed has rarely been content with just a single rate increase. Derek Tang, policy economist at Monetary Policy Analytics, said that once a tightening cycle begins, policy momentum tends to drive multiple consecutive actions.

Ian Lyngen's baseline forecast calls for 25-basis-point hikes in July, October, and December. If that path materializes, the federal funds rate would return to the 4.25% to 4.5% range, a level comparable to the peak seen before the late-2024 rate cuts, meaning more than a year of easing would be entirely reversed.

Josh Hirt, meanwhile, offers a broader framework for the market. He said the reasonable range for the number of hikes is one to six, with three serving merely as a starting point for analysis. The final trajectory will depend on how inflation data evolves.

History does offer exceptions: in 1997, the Fed raised rates only once and then remained on hold for 18 months before eventually shifting to cuts.

AI spending boom: a key pressure point in a high-rate environment

Derek Tang explicitly highlighted the optimism underpinning the AI spending cycle as one of the most vulnerable areas in the current tightening environment. Charlie Ripley, senior portfolio manager at Allianz Investment Management, explained the transmission mechanism: "hyperscaler" tech companies are expected to spend as much as $1 trillion annually on capital expenditures over the next several years, and these firms rely heavily on debt financing. Rising long-term rates would directly increase their borrowing costs and compress returns on investment.

Ruchir Sharma, chair of Rockefeller International, recently echoed similar concerns in the Financial Times: when US government bond yields climb to 5%, large tech companies will have to compete directly with the government in the debt markets, potentially crowding some of them out of access to financing. The AI boom cycle could therefore be cut short by elevated borrowing costs. Charlie Ripley also agrees that a 10-year Treasury yield at 5% could become a tipping point that triggers market selling.

Private credit and the insurance sector: a hidden systemic risk

The second vulnerability Derek Tang flagged is the insurance industry's sizable allocation to private credit. The International Monetary Fund has previously warned that insurers owned wholly or partly by private equity firms often lack transparency and tend to favor riskier fixed-income assets. If rate volatility triggers losses, the risk could spread from the insurance sector into the banking system, creating cross-industry systemic contagion. Tang said, "This is an area I think market participants should be paying more attention to."

How this cycle differs from past crises

Despite the clearly identified risks, Vanguard's Hirt believes that the potential tightening cycle now underway differs fundamentally from historical episodes that triggered major financial crises, and should not be compared too hastily. He noted that the Silicon Valley Bank collapse in 2023 and the Orange County municipal bankruptcy in 1994 both occurred when the Fed abruptly reversed market expectations, with rates rising rapidly from very low levels, catching markets off guard.

The current situation is markedly different: the Fed already went through a significant hiking cycle between 2022 and 2024, and rates remain at elevated levels, so markets are well aware of the policy direction. If rates rise again this time, it would be more about calibrating to a level that exerts downward pressure on inflation, rather than upending the market narrative.

That assessment provides some buffer logic for markets, but analysts generally stress that the structural fragilities in the AI funding chain and the private credit space warrant continued monitoring.