UBS lifts AI spending estimate to $1.4tn, points to 2027 debt limit as bond threat

A UBS note counters the Wednesday rotation away from AI and chip stocks, arguing that political risk to data-centre spending is more likely to come from state and lcoal decisions than from Washington. For bonds, the risk is skewed to the long end, where any upswing in deficits and Treasury supply would be felt most, supporting a preference for shorter maturities. The 2027 debt-ceiling brinkmanship is the event risk to watch for volatility across rates and equities. For investors already overweight AI names, the guidance favours using dips to rebalance rather than to exit.

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UBS sees more legislative gridlock than upheaval from the midterms, with the real fights over debt and the AI boom remaining intact.

Summary:

• UBS views the midterm result as a setback for President Trump and the Republicans, but not as a broad Democratic policy mandate
• It expects more legislative friction rather than a reversal of the administration's agenda, with the president holding his veto and wide executive powers
• 2027 debt-ceiling talks are flagged as the clearest bond risk, with potential for wider deficits, more Treasury supply and brinkmanship-driven volatility
• The bank still expects inflation to ease, the Fed to finish hiking and yields to settle lower
• AI capex forecasts raised to $1.0 trillion for 2026 and $1.4 trillion for 2027, with state rules seen as more important than Congress for data-centres
• UBS stays constructive on equities but recommends reducing single-stock concentration and oversized tech exposure, and favours short- to medium-term high-quality bonds

According to UBS, the 2027 debt-limit talks are now the clearest risk for US bonds following the midterm elections, while arguing that a Democratic-controlled Congress is unlikely to derail the AI investment cycle, which the bank expects to keep expanding into the coming year.

In a note after the vote, the bank described the outcome as a setback for President Trump and the Republicans, and stronger than markets had expected, but cautioned against reading it as a broad mandate for Democratic policies. It expects the result to create more friction in the legislative process rather than a sharp change in direction, noting that the president keeps his veto, Senate rules limit sweeping tax or spending bills, and the executive branch retains wide authority over tariffs and foreign policy.

On debt, UBS sees the coming debt-limit talks as the main pressure point. It suggests the negotiations could lead to planned cuts to social programs being scaled back and defense spending rising, a combination that could reverse an expected narrowing of the deficit and add to Treasury supply. Brinkmanship over the talks could also lift bond market volatility. Even so, the bank expects inflation to ease, the Federal Reserve to complete its rate-hiking cycle and Treasury yields to settle lower over time.

On AI, UBS argues that tighter congressional oversight would not necessarily slow investment, since broad federal restrictions would face both legislative and presidential hurdles. It sees state and local rules, including the outcome in Texas, as more important for the timing and location of individual data-centre projects. The bank has raised its aggregate AI capital expenditure forecasts to $1.0 trillion for 2026 and $1.4 trillion for 2027, though it notes investors are paying closer attention to the risks of overinvestment, financing and monetisation, and that higher volatility may persist.

For equities, UBS expects the result to drive near-term swings, particularly in technology and other sectors exposed to regulatory scrutiny, but does not see grounds for an immediate strategic shift in portfolios. It remains constructive on stocks, citing strong earnings, while recommending investors reduce single-stock concentration, trim oversized technology exposure and favour quality names across the AI value chain. It views politically driven weakness as an opportunity to rebalance or build positions gradually.

In fixed income, the bank sees value in high-quality bonds with short to medium maturities, but remains cautious on the longest maturities given persistent deficits and heavy issuance.