The impact of U.S. national debt on your investments

The U.S. national debt has moved above $40 trillion, more than doubling from $19.4 trillion a decade earlier.¹ The total represents years of federal spending that exceeded revenue, not a bill that comes due all at once. Investors should focus less on the milestone itself and more on how sustained borrowing may influence interest rates, federal budget choices and market confidence.

The federal government finances annual deficits by selling Treasury bills, notes and bonds. Bills mature within one year, while notes and bonds let the government borrow for longer periods. Deep and liquid U.S. markets have continued to attract buyers, but heavier borrowing can require higher yields when demand does not keep pace with the supply of new securities.

How U.S. national debt can influence interest rates

The debt total alone has not disrupted U.S. economic growth or broad financial market performance. Investors have placed greater weight on economic growth, inflation and Federal Reserve policy when setting bond yields and stock prices. Even so, the higher interest rate environment has raised the cost of financing the debt compared with the years after the global financial crisis and the pandemic.

“Markets recognize the fiscal challenge, but bond prices do not point to broad disruption,” says Rob Haworth, senior investment strategy director for U.S. Bank Asset Management. “Investors will most likely see concern about rising debt first in the Treasury market, where weaker demand would push yields higher.” Haworth attributes much of the rise in longer-term yields to inflation uncertainty, geopolitical risk and shifting policy expectations rather than a broad rejection of U.S. government debt.

Higher government debt raises federal interest costs

Higher borrowing rates increase federal interest expense as older securities mature and the Treasury replaces them with higher-yielding debt. The average interest rate on marketable U.S. Treasuries reached 3.44% as of July 31, 2026, compared with 1.42% in January 2022.² Rising interest costs can leave lawmakers with less budget flexibility unless revenue grows, other spending slows or borrowing increases further.

Federal Reserve policy can move short-term and long-term interest rates in different directions. Treasury bill rates closely track expectations for the Federal Reserve’s policy rate, while longer-term yields also reflect expected growth, inflation and the additional return investors demand to commit money for many years. These forces can create bond market volatility when investors revise their outlook for economic growth, inflation or monetary policy.

“Fed rate cuts in 2024 and 2025 lowered short-term bond yields, while shifting policy forecasts, higher expected inflation and steady growth pushed the 10-year Treasury yield toward the upper end of its range,” says Bill Merz, head of capital markets research for U.S. Bank Asset Management Group. This difference helps explain why short-term borrowing costs can fall while longer-term yields remain elevated. Investors should evaluate each part of the bond market according to its maturity, income potential and sensitivity to changing interest rates.

Treasury demand helps finance the national debt

The Treasury regularly sells securities to finance federal spending and replace maturing debt. Large auctions do not automatically create market stress, but a growing supply increases the importance of steady demand. If buyers require more compensation, the Treasury must offer higher yields, which can raise borrowing costs across the economy.

The mix of Treasury buyers has changed over time. Foreign investors remain important, while U.S. households and mutual funds have increased their role in the market. A broad buyer base can help absorb heavy issuance, although changes in demand from any major group may still affect yields and market volatility.

Global investors also own substantial amounts of U.S. stocks, real estate and other assets. Their participation reflects the size, liquidity and relative reliability of U.S. markets, along with access to a large and innovative economy. Continued foreign demand supports Treasury financing, but investors will keep assessing inflation, fiscal policy and the long-term debt path.

U.S. economic growth can improve the government debt outlook

Investors assess debt sustainability in relation to the economy that supports it. The United States benefits from deep capital markets, substantial energy and industrial capacity, strong research networks and a business environment that attracts domestic and foreign investment. These strengths can support productivity, corporate profits and tax revenue, helping the economy carry a larger debt burden.

Technology investment adds another source of potential growth. Large cloud-computing companies are spending heavily on data centers, semiconductors, power and other infrastructure needed for artificial intelligence. Economists often call these companies hyperscalers because they operate computing networks at enormous scale, but investors can understand their role more simply as major contributors to business investment and demand across the technology supply chain.

Faster economic growth can improve the debt outlook when tax revenue rises faster than federal interest costs. Productivity gains, business investment and earnings growth may slow the increase in debt relative to the size of the economy. Growth cannot close a persistent budget gap by itself, so investors should distinguish between the economy’s long-term potential and the government’s unresolved fiscal choices.

How national debt can affect stocks and bonds

Heavy Treasury borrowing can affect both bond and stock markets through interest rates. “If Treasury yields rise, investors may direct more money to bonds instead of stocks,” Haworth says. Bonds typically pay regular interest, so higher yields can make them more competitive with stocks even when the economy continues to expand.

Higher yields usually reduce the market value of existing bonds because newly issued securities offer more income. They can also pressure stock valuations by raising companies’ financing costs and giving investors a more attractive alternative to equities. If yields stabilize while corporate earnings grow, however, stocks can advance and bonds can continue to provide income, liquidity and diversification.

“Government debt becomes a market problem when bond investors begin to treat it as one,” Haworth says. Markets can absorb high debt for extended periods, especially when inflation remains contained and buyers maintain confidence in U.S. institutions and economic growth. Prices can adjust quickly if inflation expectations rise, growth weakens or Treasury buyers demand significantly higher yields.

Long-term U.S. national debt risk remains manageable, not settled

The national debt does not point to an immediate market crisis, but its long-term path deserves attention. “The government can manage its debt at this stage, but investors question whether debt can keep rising at this pace,” says Merz. The distinction separates near-term market stability from the harder fiscal decisions that persistent deficits may eventually require.

Investors often compare publicly held debt to the size of the economy, or gross domestic product (GDP). The Congressional Budget Office projects debt held by the public to rise from 101% of GDP in 2026 to 120% in 2036.³ That increase would reduce the government’s flexibility to respond to recessions, emergencies or other priorities if interest costs continue to claim a larger share of the federal budget.

Reducing the debt would require smaller annual deficits. Policymakers could pursue some combination of higher revenue, slower spending growth and policies designed to strengthen the economy’s productive capacity. Each approach carries tradeoffs for household income, business revenue and economic growth, which makes debt reduction a market issue as well as a policy debate.

What investors can do as the national debt rises

Debt headlines can sound urgent, but investors should track the channels that connect fiscal policy to portfolios: inflation, Treasury demand, interest rates, corporate earnings and market valuations. A larger supply of government bonds can put upward pressure on yields when demand weakens, although that pressure is not the dominant market force. Investors gain more useful insight from changes in yields and auction demand than from the national debt clock alone.

Interest rates can change market leadership. “After interest rates stabilized in mid-2023, stock valuations rose as corporate earnings improved and investors anticipated lower rates,” Haworth says. The episode shows that debt influences markets through a broader mix of growth, inflation and policy expectations rather than through one debt threshold.

Investors can maintain equity exposure for long-term growth while using high-quality bonds for income, liquidity and diversification. The appropriate mix depends on financial goals, spending needs, time horizon and tolerance for market declines. Rebalancing can restore a portfolio to its target allocation after large moves in either stocks or bonds.

Talk with your financial professional to confirm that your investment mix aligns with your goals and risks you can accept. Diversification cannot prevent losses, but it can reduce reliance on any single market outcome. A clear plan can help investors stay focused when markets remain calm but uncertainty rises.

FAQs

What is the interest rate on the national debt?

The U.S. Treasury pays different interest rates across many types of debt, and those rates change as the government issues new debt and older debt matures. Investors often track the average interest rate across marketable federal debt because it gives a clearer view of the government's overall borrowing cost. That average reached 3.44% as of July 31, 2026, which helps explain why interest costs now consume a larger share of federal spending than they did during the low-rate period earlier in the decade. ²

Who owns the U.S. national debt?

A wide range of buyers own U.S. Treasury securities, including foreign investors, U.S. households, mutual funds, banks, pension funds and the Federal Reserve. Foreign investors remain major buyers, while domestic investors have taken on a larger role in recent years through direct Treasury purchases and mutual funds. This buyer mix matters because strong demand can help the Treasury absorb heavy borrowing needs, while weaker demand can push yields higher to attract additional capital.

Why does the U.S. have so much debt?

The national debt grows when federal spending exceeds federal revenue, creating annual deficits that the Treasury finances by issuing bills, notes and bonds. Those deficits accumulate over time, so the debt reflects many years of policy decisions, economic cycles, emergency spending and rising interest costs. The debt crossed $40 trillion in August 2026, underscoring how quickly the total can rise when deficits persist and borrowing costs move higher.

How can national debt affect investors?

National debt can affect investors through interest rates, bond yields, stock valuations and future policy choices. If investors demand higher yields to buy Treasury securities, borrowing costs can rise across the economy and bonds can compete more directly with stocks for investor dollars. If growth remains resilient and Treasury demand stays steady, debt can remain a long-term risk rather than an immediate market disruption.

Is U.S. national debt a crisis?

U.S. national debt does not currently represent an immediate market crisis, but the long-term path deserves attention. Publicly held debt already stands near the size of the U.S. economy, and long-term projections point to a higher burden if revenue and spending policies do not change. Investors should monitor whether growth, inflation, interest rates and Treasury demand continue to support orderly markets or begin to show signs of stress.