From Washington to your Wallet: How US Debt Reaches Australia
Meet Priya, a 20-year-old commerce student living in Melbourne. She doesn’t own a Treasury bond, nor has she been to the United States. And she definitely isn’t checking the US bond market before her Monday morning lecture.
Why should she? A US national debt exceeding US$40 trillion sounds like a Washington problem, not a Priya problem. Yet she rents, hopes to buy a home one day, is currently applying for graduate roles and, like any other 20-year-old commerce student, has a Euro Summer pencilled in for July 2027. Each of these can be influenced by movements in the world’s largest government bond market.
So how does debt issued thousands of kilometres away make its way from Washington to Priya’s wallet?
Washington’s Growing Debt
When the US Government spends more than it collects in revenue, it runs a budget deficit. To finance that gap, the US Treasury borrows by issuing Treasury bonds, which are purchased by investors in exchange for interest and the eventual repayment of their principal. Persistent deficits mean persistent borrowing. In August 2026, US national debt surpassed US$40 trillion, more than double its level at the beginning of 2017. More government spending financed through debt requires more Treasury bonds, and hence a lower bond price to find more willing buyers. As the supply of bonds increases relative to demand, basic supply and demand theory suggest that their market prices face pressure to decrease.
But a lower bond price means a higher return for the investor who buys it. Suppose a Treasury promises to repay $100 in one year. An investor paying $95 for that future payment receives a greater return than one paying $98. This is the inverse relationship between bond prices and yields: when bond prices fall, yields rise.
Figure 1: Increased bond supply can lower prices and raise longer-term yields.
Source: Reserve Bank of Australia.
Growing debt can also influence what investors are willing to accept for holding government bonds over longer periods. An investor purchasing a 10-year Treasury faces a decade of uncertainty: inflation could erode the purchasing power of future payments, while changing interest rates could make newly issued bonds more attractive. Investors may therefore demand additional compensation for holding longer-term debt, known as the term premium. Recent Federal Reserve research provides evidence for this channel, estimating that a one percentage-point increase in the expected US debt-to-GDP ratio raises the 10-year Treasury term premium by around 2–3 basis points.
Why should Priya care about any of this?
The answer lies in the unusual role US Treasuries play in the world market. US Treasuries sit at the centre of global financial markets. Their enormous scale, deep liquidity and role as US-dollar-denominated government securities make their yields an important reference point for global financial markets. More specifically, the US 10-year Treasury yield is widely treated as a benchmark long-term interest rate. When that benchmark moves, investors around the world reassess the returns they are willing to accept elsewhere.
Consider an investor choosing between a 10-year US Treasury and a 10-year Australian Government bond. If US yields rise while Australian yields remain unchanged, US debt becomes relatively more attractive, all else equal. Investors may become less willing to hold Australian bonds at their existing prices. This lower demand places pressure on Australian bond prices to decrease, and hence pressure on the yields to increase.
Figure 2: Australian and US 10-year government bond yields have moved closely together over the past decade.
Source: Reserve Bank of Australia
Australian yields do not simply copy America’s – domestic inflation, economic growth and expectations for Reserve Bank policy remain crucial. However, US yields can exert pressure through interconnected global capital markets, impacting the yields found in Australia.
From Washington to Priya’s Wallet
Priya still isn’t buying government bonds, but the banks she may borrow from and the businesses she hopes will employ her still operate within the financial system those bonds help price.
Graduate roles. As Treasury yields rise, the return available by investing in US government debt rises with them. This changes the opportunity cost of investing elsewhere: investors may demand greater returns before committing capital to corporate firms that are perceived as riskier. Hence, firms may need to offer sufficiently greater returns to remain attractive, increasing their cost of debt. At the same time, higher global yields can increase borrowing costs for businesses if they were to take out a loan.
Together, these forces raise the required rate of return investments must clear, and a project may no longer be feasible at these increased costs of capital. Eventually, this can reach the labour market. If businesses postpone investment or expansion, there may be fewer positions for Priya to apply to, affecting her chances of landing a grad role.
Home ownership. Before a bank can lend Priya money for a home, it needs to fund that loan. Some of that money comes from customer deposits, while some is raised from investors in Australia and overseas. This connects Australian banks to global financial markets, where developments in major economies such as the US can influence the cost and availability of funding.
However, Australian interest rates do not simply follow America's. The RBA independently sets the cash rate according to conditions in the Australian economy. This distinction matters as most Australian mortgages have variable interest rates, meaning changes in the RBA cash rate can flow relatively quickly into mortgage repayments. So while higher US Treasury yields won't automatically make Priya's future mortgage more expensive, they form part of the global financial environment that can ultimately influence borrowing conditions in Australia.
Euro-summer. Priya’s holiday budget can also be affected through the Australian dollar. If US yields rise while Australian yields remain unchanged, US assets offer investors a higher return relative to Australian assets than they did before. This makes Australian-dollar assets relatively less attractive to global investors, reducing the incentive for capital to flow into Australia and, in turn, demand for Australian dollars. This can place downward pressure on the AUD.
This mechanism was visible in 2026: the RBA reported that rising international government bond yields, particularly in the United States, alongside lower expectations for Australian interest rates tightened the yield of Australian bonds relative to other advanced economies, contributing to a depreciation of the Australian dollar. The relationship is far from automatic, as commodity prices, risk sentiment, monetary policy expectations and broader economic conditions also influence the exchange rate. But if these forces contribute to a broader depreciation of the Australian dollar, the same hotel room, train ticket or Aperol Spritz suddenly requires more Australian dollars
Priya probably still won’t check the US bond market before her Monday morning lecture, but she might now have a reason to care about what happens there. America’s growing debt may begin as a problem confined to Washington, but the Treasury yields it can influence sit at the centre of an interconnected global financial system. Through capital markets, borrowing costs and exchange rates, those movements can eventually reach businesses and households thousands of kilometres away. US debt may be issued in Washington, but its effects can travel its way into Priya’s wallet.
References
Bhatt, A., Diercks, A. M., Eyal, B., & Skaperdas, A. (2026). The causal effect of debt oninterest rates (Finance and Economics Discussion Series 2026-031). Board of Governorsof the Federal Reserve System. https://doi.org/10.17016/FEDS.2026.031
Clarke, C., & Verrender, I. (2026, August 18). Why you should care about US bond yields[Audio podcast episode]. In ABC Business Daily. Australian Broadcasting Corporation.
Hutchinson, P., Manning, P., & Searle, E. (2026, May 28). Developments in banks’ fundingcosts and lending rates. Reserve Bank of Australia Bulletin.https://www.rba.gov.au/publications/bulletin/2026/may/developments-in-banks-funding-costs-and-lending-rates.html Reserve Bank of Australia
Lawder, D., & Bogage, J. (2026, August 19). US debt crosses $40 trillion threshold afterdoubling under Trump and Biden. Reuters. https://www.reuters.com/world/us-debt-crosses-40-trillion-threshold-after-doubling-under-trump-biden-2026-08-19/ Reuters
Reserve Bank of Australia. (n.d.). Bonds and the yield curve.https://www.rba.gov.au/education/resources/explainers/bonds-and-the-yield-curve.html
Reserve Bank of Australia. (2026). Financial conditions. In Statement on Monetary Policy– August 2026. https://www.rba.gov.au/publications/smp/2026/aug/financial-conditions.html
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