How Surging Borrowing Costs Are Consuming the U.S. Budget

The U.S. government just closed the books on Fiscal Year 2026. The final budget report card, to be perfectly frank, is the stuff of banana republics.

The deficit for the year came in at $1.992 trillion. This gap between government revenue and government spending was made up with debt.

Moreover, this $1.992 trillion in new debt was racked and stacked on top of the gross national debt. Several months ago, the national debt blew past $40 trillion. The last we checked it was clocked at a crisp $40.38 trillion.

Does anyone care? The economy keeps churning. Washington keeps spending. And stocks continue to maintain their sky-high valuations.

Yet, while everyone was marveling at the promise of AI and complaining about the price of ground beef, the underlying mechanics of America’s debt machine fundamentally shifted. At the start of the decade, we were still in an era of near-zero interest rates. Borrowing trillions was practically free.

Now, in late-2026, the low-rate era is officially dead. What’s more, the bill for decades of living on credit has finally come due.

The 2026 Fiscal Year ended on September 30, 2026. Over the past 12 months, the U.S. federal government brought in $5.403 trillion in tax revenues and tariff receipts. On paper, that sounds like a healthy haul. The problem is that Washington spent $7.396 trillion over the same period.

When you spend $7.4 trillion on a $5.4 trillion income, you get a $1.992 trillion gap. That is a 12 percent jump in the deficit compared to Fiscal Year 2025 ($1.775 trillion). This gap was plugged with issuances of new Treasury bonds.

What drove this massive shortfall? It’s all really simple. Spending accelerated while revenues stumbled.

Outlays vs. Revenue

On the spending side, mandatory outlays for entitlement programs like Social Security and Medicare continued their steady upward march as millions of Baby Boomers retired. But discretionary spending also surged. President Trump’s priorities drove big budget increases; most notably at the Department of Homeland Security, where spending spiked up 146 percent year-over-year.

On the revenue side, tax collections took a hit. Corporate income tax receipts dropped 16 percent ($70 billion) as companies utilized expanded write-offs and deductions under recent tax legislation.

Then came the tariff debacle. After the Supreme Court struck down key emergency tariffs in February, the government was forced to launch a massive refund process.

The Treasury has had to pay back $144.6 billion in tariff refunds so far, effectively cutting gross tariff receipts nearly in half. If you recall, tariff revenue was supposed to be so massive that the federal income tax could be repealed. But instead of being a net revenue generator, tariffs turned into a major cost burden, adding around $140 billion directly to this year’s deficit.

Running a 6 percent deficit-to-GDP ratio typically only happens during a severe recession or a world war. Running such a massive deficit during a period of economic growth and low unemployment is exceptionally foolish.

As noted above, deficits are the yearly shortfall, while debt is the accumulated rack and stack. And when you pile a $2 trillion deficit on top of decades of past borrowing, you end up with $40.3 trillion in debt.

Having $40 trillion in debt is bad, by all accounts. But it is still manageable when borrowing costs are low. Back in 2021, when the average interest rate on Treasury debt was roughly 1.47 percent, financing the debt burden was relatively easy.

Today, the average rate the government pays on its debt has more than doubled to 3.52 percent. Worse yet, new long-term Treasury bonds are auctioning at yields near or above 5 percent.

Surging Interest Costs

Because the Treasury constantly has to roll over maturing short-term debt into new, higher-yielding bonds, the total interest bill is exploding. In Fiscal Year 2026, the federal government’s net interest payments reached a massive $1.05 trillion. This marked an 8 percent increase from the $970 billion spent the previous year.

This rapid growth means interest costs now consume approximately 3.4 percent of the entire United States gross domestic product. This has eclipsed the previous high-water mark established in 1991. Because federal spending on interest servicing has more than doubled since 2022, it has officially vaulted into the top three largest line items in the entire federal budget.

The U.S. government now spends more money just paying interest on its past debt than it spends on the entire national defense budget and nearly the Medicare program. Only Social Security really consumes a bigger slice of the pie.

A look at federal outlays highlights the shifting priorities of the U.S. budget. Social Security is the single largest expenditure at roughly $1.66 trillion. At the same time, net interest payments have surged to a record high of $1.05 trillion.

Medicare is slightly above net interest payments on the outlays list at approximately $1.07 trillion. Meanwhile, health is slightly below at $1.02 trillion and defense spending trails behind at around $965 billion, to round out the primary categories of federal spending.

When interest costs get this high, the government has to borrow money just to pay the interest on the money it previously borrowed. If overall interest rates rise by just another 100 basis points (i.e., 1 percent), the Treasury’s interest bill could jump by another $310 billion in 2027 alone.

Does this mean the U.S. government is on the verge of bankruptcy?

Vicious Fiscal Loop

The U.S. dollar is the world’s reserve currency, and the U.S. government borrows in its own currency. It cannot run out of money in the way a household or corporate business can.

However, as Brookings Institution fellow Louise Sheiner noted, the real threat isn’t a sudden, Hollywood-style financial collapse tomorrow morning. It’s a “slow eating away” of America’s fiscal capacity.

Every dollar spent servicing old debt is a dollar that cannot be used for national infrastructure, scientific research, tax relief, education, or defense. As interest costs devour a larger percentage of total federal revenues, fiscal accommodation vanishes.

When the next recession arrives, which will surely come as night follows day, the government will be severely constrained in its ability to launch a large stimulus program or fund an emergency response. Government debt’s already over 120 percent of GDP and annual interest costs are above $1 trillion. Higher deficits will require the issuance of more debt, which will push interest rates higher and result in exploding interest outlays.

The mechanics of the nation’s fiscal dilemma operate as a self-reinforcing loop. Accumulated gross debt exceeds $40 trillion. The bond market is demanding higher returns, pushing yields on 30-year Treasury bonds up above 5 percent. These elevated interest rates directly drive up the government’s borrowing costs, causing net interest payments to surge to $1.05 trillion.

That expanding interest obligation widens the annual budget shortfall, inflating the deficit to roughly $2 trillion, which must then be financed by issuing even more debt. This continuous feedback loop repeats and accelerates over time, compounding the nation’s overall debt load with each cycle.

As we close out 2026 and look towards 2027 and beyond, this fiscal backdrop will ripple through financial markets, mortgage rates, corporate borrowing, and everyday personal finances. For businesses and investors, shrewd discernment in a world where capital has a real cost will be essential.

[Editor’s note: Get a free copy of an important special report called, “Anti-Fragile Bargain – Why You Should Own this Monster Dividend Fortress,” when you join the Economic Prism mailing list today. If you want a special trial deal to check out MN Gordon’s Wealth Prism Letter, you can grab that here.]

Sincerely,

MN Gordon
for Economic Prism

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