10-Year Treasury Yield Nears 5% as Global Bond Selloff Accelerates

The U.S. Treasury market has shed roughly $1.2 trillion in value since mid-2024, measured by the iShares 7-10 Year Treasury Bond ETF, as investors brace for a regime where capital carries a price again. The benchmark 10-year yield now sits near the 5.0% threshold, a level last tested in November 2023 before central banks briefly walked back their restrictive stance.

This is not a one-week correction. The selloff has deepened across sessions in September 2026, pulling Government of Canada bond yields higher in lockstep. The 5-year GoC yield, the primary benchmark for Canadian fixed-rate mortgages, has climbed 17 basis points since late August, translating to roughly $70 more per month on a new $500,000 mortgage at today's rates compared to early summer renewals.

Why the 5% Line Matters

Five percent is a psychological anchor, but the structural effect is what changes behavior. At that yield, long-term Treasuries become a viable alternative to dividend-paying equities for the first time in over a decade. Utilities on the TSX, which traded at a 4.1% average yield in early September, lose their income premium when a risk-free bond offers 5.0%. Capital reallocates. Stock prices adjust.

The term premium, the extra compensation investors demand for locking up money for ten years instead of rolling over short-term debt, has returned to positive territory after spending most of 2009 to 2021 near zero or negative. That shift reflects a market pricing in fiscal instability rather than just near-term central bank policy. The U.S. Congressional Budget Office projects federal interest payments will exceed $1 trillion annually by 2026 if rates hold near current levels. Canada faces a smaller but parallel constraint: Ottawa's debt-servicing costs as a share of revenue have doubled since 2021.

The Crowding-Out Mechanism

Government borrowing to fund deficits increases bond supply. When central banks are no longer net buyers, both the Federal Reserve and the Bank of Canada are running quantitative tightening programs, shrinking their balance sheets by letting bonds mature without replacement, the private market must absorb that supply. Absorption requires a price. The price is yield.

That dynamic is playing out in real time. The U.S. Treasury issued $23 trillion in debt over the last three years, much of it to refinance maturing bonds at higher rates. Canada issued $387 billion in marketable bonds between April 2023 and March 2026, according to the Department of Finance. Both governments are competing for the same global pool of buyers, and those buyers are demanding 5% to take duration risk on the longest maturities.

What Happens If Yields Break Through

If the 10-year yield settles above 5.0% for more than a few sessions, the repricing spreads. Canadian banks price their 5-year fixed mortgages roughly 120 to 180 basis points above the 5-year GoC yield. A sustained move in Treasuries pulls GoC yields higher, which pushes the typical mortgage rate toward 6.5% or above. For the 1.2 million Canadian homeowners renewing mortgages in 2026, many of whom locked in at sub-2% rates in 2021, that difference is the equivalent of adding a second car payment to the household budget.

Corporate borrowers feel it too. Investment-grade Canadian corporate bonds trade at a spread to GoC yields. When the base rate rises, borrowing costs for expansions, acquisitions, and refinancings all climb. Projects that penciled out at 4.5% all-in financing in 2023 no longer meet return hurdles at 6.2%.

The irony: if this yield spike triggers a sharp enough slowdown in credit-sensitive sectors, housing starts in Canada fell 5.3% year-over-year as of July, investors may eventually rush back into bonds as a safe haven, causing yields to plummet. But that flight to quality comes after the damage, not before.