Washington — The $40 trillion federal debt has reached a level that is difficult to ignore. The U.S. government now carries more than $40 trillion in gross federal debt, while rising interest costs are putting additional pressure on the federal budget. The debt has grown because the federal government has repeatedly spent more than it collects in revenue. Each annual deficit adds to the total. Over time, those deficits have created a much larger financial burden.
The Congressional Budget Office projects a $1.9 trillion federal budget deficit in fiscal year 2026. It also expects the deficit to grow to $3.1 trillion by 2036 under current law. The size of the debt matters for another reason. The government must pay interest on the money it has borrowed. As debt grows, interest payments can consume more of the federal budget. Here are three things to know about the $40 trillion federal debt.
1. Why Has the Federal Debt Grown So Large?
The federal debt is the result of decades of budget deficits. A deficit occurs when the government spends more money than it collects through taxes and other revenue. The Treasury borrows to cover the difference, adding to the national debt. Several factors have contributed to the increase. Wars and emergency programs have added significant costs over the years. Tax policies have also affected federal revenue. More recently, the government spent heavily during the COVID-19 pandemic.
However, the problem is broader than individual spending decisions. Some of the largest federal programs grow as the population ages. Social Security and Medicare are especially important because millions of Americans are reaching retirement age.
As the number of older Americans increases, spending on those programs also rises. At the same time, interest payments on existing debt are becoming a larger part of federal spending. That creates a difficult cycle. The government borrows to cover deficits. The accumulated debt then generates interest costs. If interest rates remain high, the government can face higher costs when it refinances existing debt or issues new bonds.
The Congressional Budget Office projects that debt held by the public will rise from 101% of GDP in 2026 to 120% in 2036 under current law. The agency also expects net interest payments to rise from 3.3% of GDP in 2026 to 4.6% in 2036. The federal government’s borrowing position can be tracked through the Treasury’s daily debt U.S. Treasury Debt to the Penny
The growth in debt also differs from the pattern seen in earlier decades. Historically, federal deficits often increased during recessions. Government spending rose as tax revenue fell. When economic growth returned, deficits often became smaller.
The United States has continued to run large deficits even during periods of economic expansion. That makes the current situation more difficult to address. Reducing the growth of federal debt would require lawmakers to reduce spending, increase revenue or use a combination of both approaches. Each option carries economic and political consequences.
2. How Does the $40 Trillion Federal Debt Affect Americans?
The $40 trillion federal debt does not mean that Americans receive a bill for a specific share of the government’s borrowing. Its effects are more indirect. One important channel is the cost of borrowing.
When the federal government sells Treasury securities, investors determine the yields they require to hold that debt. Those yields influence broader financial conditions. Mortgage rates are one example. Freddie Mac’s national mortgage survey tracks average rates for common home loans. In August 2026, the average 30-year fixed mortgage rate remained above 6.5%, keeping borrowing costs elevated for many prospective homebuyers Freddie Mac mortgage rate
For a household buying a home, even a small change in the mortgage rate can significantly affect monthly payments and the total amount paid over the life of a loan. The same principle applies to other forms of credit.
Higher borrowing costs can affect car loans, credit cards, business financing and other loans. However, federal debt does not directly determine every interest rate. Inflation, Federal Reserve policy, economic growth and investor demand also play major roles.
Still, large government borrowing can put pressure on financial markets. If investors demand higher yields to hold long-term Treasury securities, the cost of government borrowing increases. That can have wider economic effects. The debt can also influence the government’s ability to respond to future crises. During a recession, natural disaster or national emergency, policymakers may want to increase spending quickly.
A large existing debt burden can make that response more expensive. More federal revenue may already be committed to interest payments. That leaves fewer resources available for other priorities.
The CBO expects interest costs to become an increasingly important part of the federal budget. Its projections show net interest payments rising from $1 trillion in 2026 to $2.1 trillion in 2036. There is also a longer-term effect. When the government borrows heavily today, future taxpayers and policymakers may face higher interest costs. They may also have to make difficult decisions about taxes and spending later. Government borrowing is not automatically harmful.
Borrowing can help finance infrastructure, support the economy during a recession or fund an emergency response. The concern grows when large deficits continue during periods of economic growth and when debt rises faster than the economy. In that situation, interest costs can gradually take up more of the federal budget.
3. Is Washington Doing Enough to Address the Debt?
The federal government has several tools for managing its borrowing. However, those tools do not solve the underlying budget deficit. The Treasury can adjust the timing and maturity of its debt issuance. It can also conduct buybacks of certain Treasury securities to support market liquidity.
Those measures can influence financial markets. They do not eliminate the gap between federal spending and revenue. The deeper issue is the deficit. The CBO projects that the federal deficit will increase from $1.9 trillion in 2026 to $3.1 trillion in 2036 under its current baseline. The agency says the increase is driven in large part by rising interest costs and growing spending on major federal programs. The political challenge is significant.
Social Security and Medicare account for major portions of federal spending. Defense is another large category. Other domestic programs also compete for federal resources. At the same time, increasing taxes could raise additional revenue but would create its own political and economic consequences.
That leaves lawmakers with difficult choices. The Treasury has recently increased its planned purchases of longer-term government bonds. The larger buybacks are designed to improve liquidity in the Treasury market and respond to pressure in longer-dated yields. U.S. Treasury debt buyback announcement
Such measures can help manage the market for government securities, but they do not reduce the structural deficit. That distinction is important. Buying back Treasury securities is a debt-management operation. It is not the same as reducing federal spending or increasing government revenue. Financial markets can also send signals to policymakers.
Investors who purchase Treasury securities are lending money to the U.S. government. If they require higher yields, new federal borrowing becomes more expensive. Higher interest costs can then increase the deficit, which can require additional borrowing. The result can become a difficult feedback loop.
The CBO’s long-term projections show why the issue is becoming more urgent. Under current law, debt held by the public is projected to reach 120% of GDP by 2036, while the deficit is expected to remain well above its historical average.
The federal debt therefore represents more than a record-breaking number. Its growth affects the government’s future financial flexibility, the cost of servicing existing obligations and the choices available to lawmakers.
