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America’s debt test and the cost of capital in Mexico

US federal debt has roughly doubled relative to GDP since the early 1990s, and interest costs now exceed USD 1 trillion a year. Why Mexican borrowers should care.

When Bill Clinton took office, US gross federal debt stood at about 63% of GDP. The latest available reading is above 122%, according to figures shared in September 2026 by Charles-Henry Monchau, CIO at Syz Group. Wars, tax cuts, financial crises, a pandemic and rising entitlement spending all contributed. Now interest costs add to the bill: the Congressional Budget Office projects more than USD 1 trillion in net interest spending in 2026.

Three paths, one preferred

The options to regain control are well known: grow faster, address long-term costs and stop financing new promises with debt. Growth is the most appealing route, and AI-driven productivity is the great hope. Whether it arrives fast enough to outpace the interest bill is an open question.

Why it matters for Mexico

  • Global rates. Heavy Treasury issuance keeps pressure on long-term US yields, the reference for every emerging-market borrower.
  • Spreads and the peso. Periods of fiscal stress in the US tend to raise risk premiums and volatility for Mexican assets.
  • Funding strategy. Companies should favor peso funding that matches their revenue, longer tenors when available and covenants that tolerate rate volatility.

For borrowers, the practical takeaway is simple: structure financing for a world where capital stays expensive for longer.

Sources: Congressional Budget Office; Charles-Henry Monchau, Syz Group (September 2026).

This content is for informational purposes only and does not constitute investment advice or an offer of securities.

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