The 10-Year Above 5%: One Rate, Several Prices

OVERVIEW

What changed this month

Through August, real rates drove the year-over-year rise; borrowing costs followed.

What changed since the first version

This article was first published on 8 September with the Federal Reserve's 10-year constant-maturity yield at 4.77%. Since then the Federal Reserve has raised its policy-rate target range, the 10-year yield has moved above 5%, and the weekly 30-year mortgage average has moved above 7%. This revision updates every figure and adds six exhibits.

The main finding

Through August, the increase was concentrated in the real yield: it averaged 2.40%, within one basis point of its October 2023 monthly peak, while inflation compensation fell. September brought a policy-rate increase and a further rise in long yields.

Where it shows up

Mortgages above 7%. A tight Baa spread, leaving Treasury yields as a large component of borrowing costs. A positive 10-year/3-month spread after a long inversion, interrupted by brief reinversions in 2025. A full-repricing sensitivity of about $324 billion a year for each percentage point on $32.38 trillion of debt held by the public.

01 | THE LEVEL

The 10-year is back above 5%

The Federal Reserve's 10-year constant-maturity yield reached 5.18% on 24 September and was 5.17% on 25 September.

Where it stands

The Federal Reserve's 10-year constant-maturity yield reached 5.18% on 24 September 2026 and was 5.17% on 25 September, up from 4.77% on 3 September. The September 24 observation was the highest since 2007. The monthly average was 4.68% in August 2026, compared with 4.26% in August 2025; the previous cycle's monthly peak was 4.80% in October 2023.

Why this one rate matters

The 10-year is the reference price for long-lived money. Mortgage rates, corporate bond yields, the discount rates used in valuation and the cost of refinancing federal debt all start from it. A sustained move changes each through different channels and on different schedules.

What the chart does not say

A level alone does not say whether borrowing is expensive in real terms, or whether investors expect more inflation. The next exhibit separates the two.

02 | WHAT MOVED

Real yields explain the increase through August

Through August, the real yield rose while inflation compensation fell.

Splitting the yield

The 10-year yield can be split into the real yield on inflation-protected Treasuries and the extra compensation investors demand for inflation. In August 2026 the real yield averaged 2.40% and inflation compensation 2.28%.

The last twelve months

From August 2025 to August 2026 the 10-year rose 0.42 points. The real yield rose 0.52 points; inflation compensation fell from 2.38% to 2.28%. On this monthly decomposition, the increase came entirely from the real-yield component.

How high real rates are

The 2.40% real yield came within one basis point of the October 2023 monthly peak of 2.41% and was otherwise the highest since 2008. High real yields tend to weigh most on long-duration assets, including housing, growth equities and long-term projects. September is not included in these monthly data, so this decomposition applies only through August.

03 | SEPTEMBER

September added a policy-rate increase and higher long yields

The Fed raised its target range on 16 September; the weekly mortgage average was 7.03% on 24 September.

The Fed moved first

On 16 September, the Federal Reserve raised its target range by a quarter point to 3.75%-4.00% in a 12-0 vote. The September median projection placed the federal funds rate at 4.1% at the end of both 2026 and 2027, with PCE inflation at 3.7% in 2026.

Then long yields rose

The Federal Reserve's 10-year constant-maturity yield was 4.96% on 22 September and 5.18% on 24 September. Those observations establish the move, but do not by themselves identify a single cause.

Mortgages followed within days

From 3 September to 24 September, the weekly 30-year mortgage average rose from 6.71% to 7.03%, or 32 basis points. Over the same dates, DGS10 rose from 4.77% to 5.18%, or 41 basis points. The mortgage increase was about four-fifths of the Treasury move.

04 | THE CURVE

The curve is positive again after a long inversion

The 10-year exceeded the 3-month bill by 0.80 percentage point in August 2026.

From inverted to positive

The spread was continuously negative from November 2022 through November 2024, the longest unbroken inversion in this series since 2000. It briefly returned below zero in March-April and June-August 2025. By August 2026, the 10-year exceeded the 3-month bill by 0.80 percentage point.

What the spread can - and cannot - show

A positive spread can result from lower short rates, higher long rates or both. The spread widened to 0.80 percentage point by August 2026, but this series alone cannot distinguish expected policy rates, inflation compensation and the term premium.

What it means for banks and borrowers

A positive curve can support traditional maturity transformation, but funding costs, hedging and credit losses also matter. Higher long rates raise the price of locking in long-term financing.

05 | CORPORATE CREDIT

Corporate spreads stayed tight as Treasuries repriced

The August Baa spread was 1.64 percentage points, below its 2000-2025 average.

A tight spread

Baa-rated companies paid 1.64 points over the 10-year in August 2026, below the 2000-2025 average of 2.47 and near the December 2024 low of 1.41. The August spread was 0.83 percentage point below its 2000-2025 average and 0.23 point above the December 2024 low.

So the whole cost rose

In August 2026, the Baa spread was 1.64 percentage points and the 10-year monthly average was 4.68%, implying a Baa yield of 6.32%. Later Treasury increases would raise the benchmark component if the spread were unchanged.

The risk in a tight spread

Narrow spreads leave little cushion. If growth slows while rates stay high, spreads have historically widened quickly, as in 2008 and 2020.

06 | THE BUDGET

Higher rates reach the federal budget gradually

A simple full-repricing sensitivity is about $324 billion per percentage point.

The baseline

CBO projected net interest above $1.0 trillion in fiscal 2026, 3.3% of GDP, rising to 4.6% by 2036, after $970 billion in 2025. Those projections were made in February, before this year's rise in long rates.

The arithmetic

Debt held by the public was $32.38 trillion on 23 September. If all of it repriced one point higher, annual interest would rise by about $324 billion; half a point, about $162 billion. In practice debt reprices as it matures, so the cost arrives over several years.

Why it compounds

Higher interest expense can add to deficits and issuance over time, all else equal. Exhibit 6 is an arithmetic sensitivity, not an estimate of how markets will respond.

07 | IMPLICATIONS

What a 5% benchmark changes

Real rates now set the bar for every borrower.

What to watch

Core PCE inflation for August (30 September), September payrolls (2 October) and the Fed's 28 October meeting. For the long end, Treasury auction results and whether inflation compensation begins to rise.

For valuation

A higher risk-free rate raises the discount rate on every long-dated cash flow. Stocks can fall on good earnings if rates rise faster than profit expectations; the most exposed are those whose value depends on profits far in the future.

For a household

The weekly 30-year mortgage average rose 32 basis points from 3 September to 24 September as the 10-year constant-maturity yield moved above 5%.

For a company

With the August Baa spread at 1.64 percentage points, Treasury yields remained a large component of borrowing costs. Future refinancing costs depend on both the benchmark yield and the credit spread.

For an investor

The 10-year TIPS yield averaged 2.40% in August. That is a real-yield benchmark, not a guaranteed holding-period return for an investor who sells before maturity.

For the budget

The CBO baseline predates this move. The next update will show how much of it has entered the interest line.

What would change the picture

A rise in inflation compensation would add an inflation component to the real-yield story. Wider corporate spreads would add credit risk to the repricing.

Conditional implications, not forecasts.