The U.S. National Debt Just Surpassed $40 Trillion. Here's What This Means for Your Portfolio in 2026 and Beyond.

Besides the artificial intelligence trade, investors have been obsessed with any macroeconomic news that hits headlines. And it's hard to find a story in recent weeks that captured the market's attention like the U.S surpassing $40 trillion in gross federal debt. By any measure, this is an absolutely mind-boggling number.

The debt balance has expanded by 377% in the past two decades. And it currently represents 123% of the country's total GDP figure. The Congressional Budget Office estimates that it will continue climbing, reaching $64 trillion by 2036.

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Investors had better get used to hearing more about the U.S. national debt problem. Here's what this macro trend means for your portfolio in 2026 and beyond.

The U.S. has the world's largest and most advanced economy, driven by dominance in the technology sector. It controls the global reserve currency in the dollar. And it has the most robust and liquid capital markets. These advantageous traits support the argument that the nation can keep borrowing indefinitely.

Of course, this can continue only as long as buyers of Treasuries trust that they will get paid back. So far, this hasn't been an issue. And things that appear unsustainable can go on a lot longer than people anticipate.

It makes sense for the government to embark on stimulative measures during recessions or other adverse shocks. This was precisely what happened during the global financial crisis toward the end of the 2000s, and to help boost the economy when the COVID-19 pandemic hit. The government steps in to keep things running.

What's interesting to see, though, is that the debt burden has kept rising even though the economy is on solid footing. Through the first 10 months of fiscal 2026, the Treasury Department ran a deficit of $1.8 trillion, 10% higher than in the same period last fiscal year. The U.S. spends more on interest payments than it does on national defense.

No matter what politicians say, the government isn't able and willing to cut spending. Just look at the DOGE (Department of Government Efficiency) initiative, which was by any account a failure.

And raising taxes isn't a popular campaign platform, unless politicians want to increase their chances of losing. This means that the debt will keep rising. Furthermore, this supports elevated inflation and interest rates. This will certainly be true relative to the environment we witnessed during much of the 2010s.