Are high interest rates sustainable? The debate over US debt, inflation and the Fed
Interest rates are no longer near zero, and the federal debt is close to its largest size next to the economy since the Second World War. Three camps read what that means very differently. This is each case, the data it rests on, and what would show it is right.
- 5.10%Yield on the 10-year Treasury
- 19.5%Of federal revenue spent on net interest, fiscal 2026
- 97%Federal debt held by the public, as a share of GDP
- 3.0%Core PCE inflation, against a 2% target
The debate in brief
- Higher for longer holds. The economy can carry today's rates, and inflation keeps drifting back toward 2%.
- The debt forces the Fed's hand. Interest costs grow until cutting rates, capping yields or buying bonds is the easier path, and inflation does the rest.
- Something breaks first. High rates slow lending and hiring until a downturn brings rates down the hard way.
- Why it matters. Each path moves bond yields, the dollar and what investors pay for a dollar of earnings in a different direction.
Where the US economy stands now
The 10-year Treasury yields 5.10% and the Fed's policy rate is 3.88%. Lenders are asking more to lend to the government for ten years than the Fed charges overnight.
Core PCE inflation, the measure the Fed targets, was 3.0% in August 2026, above the 2% target, and the bond market prices 2.32% a year over the next ten years.
Net interest took 19.5% of federal revenue in fiscal 2026, debt held by the public was 97.4% of GDP at the end of Q2 2026, and the deficit over the twelve months to September 2026 was 6.1% of GDP.
Unemployment is 4.2%. The Fed holds $6.8 trillion of assets, and the M2 money supply grew 5.7% over the year.
The same numbers support all three readings. What separates the camps is which of them they expect to give way first.
Figures as at October 2026, from the latest official releases.
Why the debate is louder now
For most of the decade after 2008, the federal government could borrow for almost nothing. Short-term rates sat near zero, and the Federal Reserve bought trillions of dollars of bonds to keep long-term rates low. A growing debt was cheap to carry.
That ended in 2022. To bring down the fastest inflation in forty years, the Fed raised its policy rate from near zero to over 5% in about sixteen months, the fastest increase since the early 1980s. Every Treasury bond that has matured since is refinanced at the new rates, while the debt keeps growing.
Interest is now one of the largest items in the federal budget, and in fiscal 2024 net interest passed spending on national defense. How far that share climbs from here depends on rates, and that is where the camps divide.
The same debt costs a different amount every time it is refinanced.
Camp one
The case that higher rates can last
This camp holds that today's rates are closer to normal than the decade before them. Before 2008, a 10-year yield of 4% to 5% was ordinary, and the economy grew through it. On this view, the near-zero years were the exception: a response to a financial crisis and then a pandemic.
Its case rests on the economy carrying the higher cost. As long as employers keep hiring and unemployment stays low, a higher rate is a price the economy can pay. Households and many companies also locked in cheap fixed-rate debt in the low-rate years, so higher rates reach them slowly.
On the debt, supporters point to the arithmetic of growth. What matters is the interest rate on the debt against how fast the economy grows in dollars. When nominal growth runs above the average rate the government pays, the debt can hold steady or shrink next to GDP even with modest deficits.
On inflation, they watch the bond market itself. While the inflation priced into Treasuries stays near the Fed's goal, investors are signaling that they expect the Fed to keep prices in check.
- Inflation keeps easing toward 2% without a rise in unemployment.
- Breakeven inflation stays near 2% while rates stay high.
- Interest's share of federal revenue levels off as growth lifts tax receipts.
Critics answer that the arithmetic of growth only works if deficits are small, and that deficits of several percent of GDP while unemployment is low have been rare outside wartime.
Camp two
The case that the debt forces the Fed's hand
This camp starts from the size of the debt. With federal debt close to the size of the whole economy, every point on interest rates eventually adds about a point of GDP to the yearly interest bill as old bonds are refinanced. Higher rates widen the deficit, a wider deficit means more borrowing, and more borrowing at high rates raises the interest bill again.
Economists call the point where the budget, not the central bank, starts to set the course of rates fiscal dominance. Its supporters argue that a central bank facing a fast-growing interest bill comes under heavy pressure to cut rates, to cap long-term yields, or to buy government bonds again, and that each of those adds money to the economy.
History offers precedents. From 1942 to 1951 the Fed held Treasury yields down to help finance the war, until an accord with the Treasury freed it. Japan's central bank capped its 10-year yield from 2016 to 2024. In 2022 the Bank of England had to buy long-dated government bonds after a budget plan sent their yields soaring.
If it comes to that, supporters expect higher inflation over time, a weaker dollar, and investors moving toward assets that cannot be created at will, such as gold, property and Bitcoin. That is why the Fed's balance sheet and the money supply are the charts this camp watches most closely.
- Long-term yields rise even as the Fed cuts, a sign investors want more to hold government debt.
- The Fed's balance sheet grows again outside a crisis.
- Inflation expectations drift well above 2%.
- Interest's share of federal revenue keeps climbing.
Critics answer that the Fed has shown it will hold rates high when inflation demands it, as it did in 2022 and 2023, and that the US borrows in its own currency in the deepest bond market in the world, which has kept demand for Treasuries strong through every scare so far.
The question is rarely whether a debt can be paid in dollars. It is what those dollars will buy.
Camp three
The case that something breaks first
This camp agrees that rates are high and expects them to come down, but not because of the debt. High rates work with a delay: they slow lending, then hiring, then spending. On this view, the full effect of a rate increase takes a year or two to reach the economy, and the strain shows first where borrowing costs bite hardest: small businesses, commercial property and stretched households.
The yield curve is the classic warning. An inverted curve, with short rates above long ones, has preceded every US recession since the 1960s, though not every inversion has been followed by one. The jobs data comes next: openings fall before layoffs rise, and weekly claims turn before the unemployment rate.
If a downturn comes, the Fed cuts because the economy needs it, the deficit widens as tax receipts fall, and the debt question returns once the recovery begins.
- Weekly jobless claims rise and stay higher for several months.
- Job openings keep falling and unemployment rises by half a point or more.
- The Fed cuts in response to weaker jobs data rather than lower inflation.
Critics answer that the curve inverted in 2022 and the expected recession did not follow within the usual year or two, and that a labor market can cool through fewer openings rather than more layoffs.
What each path has meant for stocks
None of these is a forecast, and markets often move before the data settles the argument. Each path has tended to favor different kinds of companies.
- Higher for longer. Money costs more, so investors pay less today for profits far in the future. Companies with steady cash flow now and little debt to refinance have tended to hold up better than those whose value rests on growth years away.
- The debt forces the Fed's hand. Higher inflation erodes the value of cash and fixed-rate bonds. Companies that can raise their prices, and real assets, have tended to keep their value better than long-dated bonds.
- Something breaks first. Earnings fall in a recession while rates fall too. Long-dated bonds have tended to gain, and companies with strong balance sheets to come through the drop better.
How to follow the debate with data
Every chart in this story is on TenQ's macro page, updated from official sources as each release lands. None of them settles the argument on its own: what decides it is which of them moves first.
Back to the macro data: rates, inflation, debt, the dollar and jobs