The U.S. national debt has just crossed another major threshold, and the pace of borrowing shows little sign of slowing. After passing $36 trillion in late 2024, the total federal debt climbed to roughly $38.4 trillion by early 2026. That rise is not just a government accounting milestone. It is increasingly shaping forces like interest rates, borrowing costs, and the monthly expenses facing American households.
Every time the federal government runs a deficit, it must borrow money by issuing Treasury securities. As those borrowing needs balloon, the ripple effects extend far beyond Washington. Mortgage rates, auto loans, credit card interest, and even business investment decisions can all be influenced by the size and pace of government borrowing.
Debt Growth Is Accelerating
The Treasury Department tracks federal borrowing daily through its public Debt to the Penny dataset, which shows the national debt rising steadily in recent years. After surpassing $36 trillion in November 2024, the total continued climbing through 2025 and into 2026 as government spending continued to outpace tax revenue.
Large annual deficits remain the main culprit. The federal government has been running deficits approaching $2 trillion per year, according to data compiled in the Treasury’s Monthly Treasury Statement. These shortfalls require the Treasury to sell enormous quantities of bonds to investors around the world.
That constant stream of new bonds matters because investors demand compensation to hold them. When the supply of Treasury securities expands quickly, yields tend to move higher as well. Rising Treasury yields ripple through the broader financial system because they act as the benchmark for many other interest rates.
Listen to the Bond Market, Not Just the Fed
When considering interest rates, many Americans focus on the Federal Reserve. After all, the central bank sets the federal funds rate, which influences short-term borrowing costs. But longer term interest rates, including mortgage rates, are largely driven by the bond market.
The yield on the 10-year Treasury note is particularly important. Mortgage lenders use it as a baseline when pricing home loans, while corporations rely on it when issuing bonds to fund expansion.
Even when the Fed begins lowering its policy rate, heavy Treasury borrowing can keep longer term yields elevated. When investors must absorb a growing supply of government debt, they may demand higher yields to do so. That can keep borrowing costs higher across the economy even as the Fed eases.
Officials within the Treasury Department regularly examine these market pressures. Discussions by the Treasury Borrowing Advisory Committee, which advises the government on debt issuance, regularly wrestles with how to meet federal financing needs without disrupting bond markets.
The Direct Impact on Mortgages and Loans
The connection between federal borrowing and household finances becomes most evident in housing markets. Mortgage rates tend to move alongside the 10-year Treasury yield. When Treasury yields climb, mortgage rates typically follow.
A small change in mortgage rates can dramatically affect affordability. For example, on a $400,000 mortgage, a one percentage point increase in interest rates can add hundreds of dollars to a monthly payment and tens of thousands of dollars in interest over the life of the loan.
The effects also spill over into auto loans and credit cards. Credit card interest rates are often tied to benchmark lending rates that move with broader financial conditions. When borrowing costs remain elevated across the economy, credit card APRs tend to remain high as well.
That’s already playing out. Credit card interest rates in the U.S. have hovered near record highs in recent years, according to data compiled by the Federal Reserve’s consumer credit report. Elevated borrowing costs make it harder for households to carry balances, finance vehicles, or manage unexpected expenses.
Businesses Feel the Pressure Too
The effects are not limited to consumers. Businesses that rely on long-term financing also face higher costs when Treasury yields rise.
Companies issuing bonds must offer yields that compete with government securities. If Treasury yields climb, corporate borrowing becomes more expensive, and that can slow investment in key areas like factories, infrastructure, and hiring.
Industries that rely heavily on financing, including utilities, construction, and manufacturing, are particularly sensitive to interest rate changes. When capital costs rise, those businesses often pass some of the expense along through higher prices.
Over time, that dynamic can filter into everything from housing construction to electricity bills.
The Growing Cost of Interest Payments
Another byproduct of rising debt is the government’s own interest bill. As more bonds are issued and older debt is refinanced at higher rates, the cost of servicing the debt keeps climbing.
Federal interest payments have already become one of the fastest growing categories of government spending. According to Treasury data, interest costs now rival those of major federal programs.
When a larger share of tax revenue goes toward interest payments, policymakers have less flexibility in the rest of the budget. That can make it harder to do things like fund new programs, respond to economic downturns, or reduce deficits without difficult tradeoffs.
Economic Balancing Act
Despite the rapid rise in federal debt, the U.S. still benefits from several advantages. Treasury securities remain among the most trusted assets in global finance, and the U.S. dollar continues to serve as the world’s dominant reserve currency.
Those factors help ensure strong global demand for Treasury bonds, which allows the government to borrow at relatively favorable rates compared with many other countries.
Still, the long-term trajectory of the debt is drawing increasing attention from economists and policymakers. As deficits mount, the interaction between federal borrowing and interest rates becomes more consequential for the broader economy.
For households, the impact is already visible in mortgage costs, credit card rates, and loan payments. For businesses, borrowing costs shape investment decisions and hiring plans.
The national debt can seem like a distant policy issue. But in reality, the forces driving it are closely connected to the interest rates Americans encounter every time they finance a home, buy a car, or carry a balance on a credit card.
