US mortgage rates climb again as 10-year Treasury yield crosses 5% to hit a 19-year high

Mortgage rates in the United States are climbing again, threatening to deepen the country’s housing affordability crisis as the benchmark 10-year Treasury yield crosses 5 per cent and reaches its highest level since 2007. The renewed rise in borrowing costs comes after hopes earlier this year that mortgage rates would gradually ease, potentially bringing more buyers back into a housing market already struggling with expensive homes and limited supply.

The average rate on a 30-year fixed mortgage has moved back towards 7 per cent, with different market trackers showing rates around or above that level. The 10-year US Treasury yield, meanwhile, rose above 5.04 per cent on Tuesday, its highest level in 19 years. The movement matters to homebuyers because American mortgage rates tend to track the 10-year Treasury yield closely rather than moving directly with the Federal Reserve’s short-term policy rate.

Why mortgages follow Treasuries

Mortgage lenders need to offer investors a return above what they could receive from comparatively low-risk US government bonds. When the yield on the 10-year Treasury rises, mortgage-backed securities must generally offer more attractive returns as well. That eventually feeds through to the interest rates lenders quote to people buying or refinancing homes.

The spread between mortgage rates and Treasury yields can change according to market conditions, but the direction of movement is often similar. The latest Treasury sell-off has therefore rapidly translated into renewed upward pressure on mortgages, reversing some of the relief borrowers had experienced earlier in 2026.

Why yields are surging

Several forces are pushing Treasury yields higher simultaneously. Rising oil prices have revived concerns that inflation could remain stubbornly above the Federal Reserve’s 2 per cent target. Higher energy prices can spread through the economy by increasing transportation, manufacturing and household costs, making it more difficult for inflation to fall sustainably.

Investors have consequently increased bets that the Federal Reserve will tighten monetary policy again. Markets are pricing a high probability of a quarter-percentage-point rate increase, strengthening expectations that borrowing conditions will remain restrictive. Although the Fed does not directly set mortgage rates, expectations about its future policy heavily influence bond markets and longer-term interest rates.

Another source of pressure is America’s enormous borrowing requirement. Investors are increasingly focused on federal deficits and the supply of Treasury securities needed to finance government spending. Greater bond supply can require higher yields to attract sufficient demand. Concerns surrounding the sustainability of US public finances have therefore become another factor keeping long-term borrowing costs elevated.

Homebuyers feel pressure

The consequences are significant for Americans attempting to purchase homes. Even relatively small movements in mortgage rates can substantially alter monthly repayments because housing loans typically run for decades. A buyer taking a $400,000, 30-year mortgage at 6 per cent would face principal-and-interest payments of roughly $2,400 a month. At 7 per cent, that rises to around $2,660 — more than $3,000 extra annually.

Higher mortgage rates also affect existing homeowners indirectly. Millions of Americans locked in exceptionally cheap mortgages when interest rates were near historic lows, giving them little incentive to sell their properties and replace those loans with substantially more expensive ones. This so-called lock-in effect constrains housing supply and can keep property prices elevated even as affordability deteriorates.

Relief may take time

The outlook now depends heavily on inflation, energy prices, Federal Reserve policy and Treasury-market conditions. If inflation moderates and investors become convinced that the Fed can eventually reduce interest rates, Treasury yields and mortgages could retreat. Persistent inflation or additional rate increases, however, could keep borrowing costs elevated for longer.

For prospective homebuyers, the return of mortgage rates towards 7 per cent represents another setback after expectations that 2026 would bring meaningful relief. The deeper problem is that Americans are being squeezed from both directions: borrowing remains expensive while home prices have yet to decline sufficiently to restore affordability. Until either mortgage rates fall substantially or housing supply expands enough to moderate prices, the US housing market is likely to remain difficult for first-time and middle-income buyers.