The Yield Curve: What the Level Says That the Slope Doesn’t

The yield curve carries two signals: its slope, which speaks to the cycle, and its level, which sets what every borrower pays to refinance. Commentary watches the first; balance sheets absorb the second, one maturity at a time.

The US curve has already been through every combination of slope and level since 2010. What changes across them is not the recession signal but the cost of the next loan.

Two coordinates for one curve

The slope is the gap between long and short maturities, typically the 10-year minus the 2-year or the 3-month Treasury. It reflects how the market sees the path ahead: a negative gap means investors expect weaker growth, lower policy rates, or both. Its main route into the real economy is the banking system, through narrower lending margins and tighter credit standards, a mechanism laid out in how an inverted curve works through bank credit.

The level is where the curve sits on the vertical axis. It says how much a 10-year loan costs today for the federal government, for an investment-grade company, for a household taking out a mortgage. Its route into the economy is more direct. As each tranche of debt matures, it is refinanced at the going rate, and the average cost of the stock drifts toward the market level.

Slope and level can move independently, as the US curve shows. From July 2022 to August 2024 the monthly 10-year minus 2-year spread was negative for 26 consecutive months while the 10-year itself averaged 3.93%. At end-July 2016 the spread was +0.79 point with a 10-year at 1.46%; at end-December 2025 it was +0.71 with a 10-year at 4.18%, according to Treasury constant-maturity yields (DGS10 and DGS2).

Same slope, nearly triple the level.

How the level gets into balance sheets

The level works through maturity schedules. Every borrower has a calendar of debt coming due, and that calendar decides how much of the stock is repriced in a given year. A company whose bonds average around ten years to maturity rolls over roughly a tenth of its debt each year; a high-yield issuer with shorter debt rolls over noticeably more. The process is slow, and it keeps running long after the curve has changed shape.

The federal government reprices faster than its average maturity suggests. Treasury bills, maturing in under a year, made up 21.2% of marketable debt on April 30, 2025, according to the Treasury’s presentation to the Treasury Borrowing Advisory Committee for that quarter, and they turn over several times a year. Net interest outlays rose from 1.49% of GDP in fiscal 2021 to 3.15% in fiscal 2025, according to the Office of Management and Budget (series FYOIGDA188S). The stock of debt did not double over those four years. The rate at which it was refinanced did.

Households sit at the other extreme. According to the Federal Housing Finance Agency’s National Mortgage Database, 95.9% of outstanding US mortgages carried a fixed rate in the fourth quarter of 2025, and 82.8% were 30-year loans. The new level reaches them only when they move or buy: existing-home sales fell to 4.06 million in 2024, their lowest since 1995, according to the National Association of Realtors.

What borrowers pay now

The Treasury yield is only the base. Each category of borrower pays a premium on top, and in this cycle the premiums have done little of the work. The average yield on corporate bonds rated Baa by Moody’s was 4.87% over 2010-2020. It ended 2019 at 3.90%, ended 2025 at 5.90% and reached 6.73% on October 6, 2026 (series DBAA). Its spread over the 10-year Treasury actually narrowed, from 1.98 points at end-2019 to 1.46 on October 6, 2026: the whole increase came from the Treasury level.

Mortgage borrowers face a similar shift. The 30-year fixed rate surveyed by Freddie Mac averaged 3.99% over 2015-2019, 6.19% in December 2025 and stood at 7.28% on October 1, 2026 (series MORTGAGE30US). For a household that bought in 2020 and locked in, nothing changes until it sells. For a first-time buyer, the monthly payment on a 30-year loan at 7.28% is 43.5% higher than at the 2015-2019 average rate, on an Eco3min calculation.

The real component explains part of the shift. The 10-year TIPS yield, the return after expected inflation, stood at 2.91% on October 6, 2026, its highest since 2008, and its role in the cost of capital is set out in the repricing of real rates.

Two channels, two time scales

The slope channel acts over quarters. Between the first inversion of the 10-year minus 2-year spread and the business-cycle peak dated by the National Bureau of Economic Research, 17, 19, 13, 24 and 6 months elapsed ahead of the 1980, 1990, 2001, 2008 and 2020 recessions. That window is what the recession debate focuses on, and the spread most often used to track it is defined in what the 10-year minus 3-month spread measures.

The level channel acts over years, at the pace of maturity schedules. A shift in the level does not deliver its full effect within the same window as a shift in slope, and it can keep tightening financial conditions after the slope has returned to normal. It also reorders which borrowers are exposed first. During the 2022-2024 inversion, borrowers with short maturities, such as high-yield issuers that had borrowed in 2018-2021, felt the higher level before holders of 30-year mortgages or investment-grade bonds issued before 2022.

That ordering is invisible in the slope. It appears only when the level of rates is set against the maturity structure of each balance sheet.

Since the curve turned positive

The 2024 dis-inversion was widely read as the end of a restrictive episode. The level then kept rising while the slope flattened again. On October 2, 2026, the 10-year yield was 5.28% and the 2-year 4.83%, a spread of 0.45 point against 0.64 on average in December 2025. A reading based on slope alone would have registered a curve that barely moved, while the 10-year yield had gained 1.18 points in twelve months, from 4.10% on October 2, 2025.

Two indicators separate the signals. The 10-year minus 2-year spread tracks the slope and its links to the cycle. The gap between the 10-year yield and its 2010-2020 average of 2.27% measures how far the cost of refinancing has moved from the conditions that most of today’s debt stock was issued under. As long as that gap stays wide, each maturing tranche carries part of it onto a balance sheet.

Last updated — 8 October 2026