How the World Works
Mechanic 02 · Government debt

Why some governments pay more to borrow

France and Germany use the same currency and the same central bank, yet France now pays about 1.4 percentage points more to borrow for ten years. That gap, the sovereign spread, is how markets price the risk of lending to a government. This page explains what drives it, how it spreads into the wider economy, and where it stands today.

1 · Key concepts

The terms you need

Each definition is followed by a real example from the latest data.

Sovereign spread
The difference between the yield on one government’s bonds and a benchmark government’s bonds of the same maturity, usually quoted in basis points. In the euro area the benchmark is Germany.
Example: France 10-year 4.85% − Germany 10-year 3.43% = a spread of 142 bp.
Budget deficit
The amount by which a government’s spending exceeds its revenue in a year, usually shown as a share of GDP. The government covers the gap by borrowing, mostly by selling bonds.
Example: France’s deficit is projected at about 5.4% of GDP in 2026, above the EU’s 3% limit.
Debt-to-GDP ratio
A government’s total debt divided by the economy’s annual output. It shows how heavy the debt is relative to the country’s ability to pay. The EU’s reference value is 60%.
Example: French government debt is about 119% of GDP.
Credit rating
A grade from an agency such as S&P, Moody’s or Fitch on how likely a borrower is to repay. A downgrade can force some investors, whose rules limit how much lower-rated debt they hold, to sell.
Example: Ratings run from AAA, the safest, down through AA, A and BBB. Below BBB is called “high yield” or “junk”.
Government bond
A loan to a government. The buyer pays a price today, receives a fixed interest payment (the coupon) every year, and gets the face value back when the bond matures.
Example: Treasuries (US), Bunds (Germany), OATs (France), gilts (UK), JGBs (Japan), CGBs (China).
Bond yield
The annual return a buyer earns by purchasing a bond at today’s price and holding it to maturity. When a bond’s price falls, its yield rises. The 10-year yield is the benchmark for mortgages and long-term business loans.
Example: The US 10-year Treasury yield is 5.14%.
Term premium
The extra yield investors demand for locking their money up for many years, on top of what they expect short-term rates to average. It compensates for uncertainty about inflation and government finances.
Example: If investors expect the policy rate to average 4.0% over the next ten years and the 10-year yield is 4.5%, the term premium is about 0.5 points. It can’t be observed directly, so economists estimate it with models.
Basis point (bp)
One hundredth of a percentage point, used for small moves in rates and yields. 25 bp = 0.25 percentage points.
Example: The US 10-year yield has risen 101 bp since February, from 4.13% to 5.14%.
2 · How it works

From political doubt to higher borrowing costs

A widening spread starts with doubt about a government’s finances. Left unchecked, it can feed on itself.

  1. 1 →Fiscal or political doubtA large deficit, rising debt or a government that can’t pass a budget makes investors question how the debt will be brought under control.
  2. 2 →Investors demand moreThey sell the country’s bonds or buy fewer at auctions. Bond prices fall, so yields rise.
  3. 3 →The spread widensYields rise compared with the benchmark. The gap measures the extra risk premium.
  4. 4 →Costs spread through the economyBanks, companies and homebuyers in that country pay more to borrow. The currency can weaken.
  5. 5 ↺The loop closesA higher interest bill widens the deficit. Rating agencies may downgrade, forcing some investors to sell. Back to link 1.
How to calculate a spread
Spread (bp) = (country yield − benchmark yield) × 100

France 4.85% − Germany 3.43% = 1.42 percentage points, or 142 basis points.

Why it measures political risk so cleanly
Same central bank + same currency = same expected rates

Inside the euro area, every country faces the same ECB interest rate. So the gap between French and German yields isolates one thing: the risk of lending to one government rather than the other.

What can stop a spiral
A central bank willing to buy

In 2012, ECB President Mario Draghi pledged to do “whatever it takes” to preserve the euro, and spreads fell. Since 2022 the ECB has had a tool, the Transmission Protection Instrument, to buy the bonds of a country whose borrowing costs rise in a disorderly way, but only if that country follows EU fiscal rules.

For comparison
The euro debt crisis, 2010–2012

At the height of the crisis, Italy’s 10-year spread over Germany rose above 500 bp and Spain’s above 600 bp. France’s 142 bp is far below those levels, but it is France’s widest since then.

Outside a currency union
Where the risk shows up instead

A country with its own currency has no obvious benchmark. Fiscal doubt shows up in a higher term premium and a weaker currency. After the UK’s September 2022 mini-budget, gilt yields jumped, the pound fell to a record low against the dollar, and the Bank of England stepped in to buy gilts.

3 · Today’s numbers

France’s spread over Germany

142 bpSpread, October
60 bpSpread, February
4.85%France 10-year
3.43%Germany 10-year
Usual range, 20–50 bp04080120160 60 · Feb 26 142 bp Oct 24Apr 25Oct 25Apr 26Oct 26
France minus Germany, 10-year government bond yields, monthly readings, basis points. Daily high: about 147 bp on 5 October 2026.

What stands out today

  • The spread has more than doubled since February.
  • Most of the move came in two months: 84 bp in August, 101 in September, 142 in October.

The drivers

Debt of about 119% of GDP, a deficit near 5.4%, and no stable majority in parliament since the June 2024 election.

4 · In the news

This mechanic in the news

Recent stories that show this mechanism at work, newest first.

Government finances → Link 4Cause UK borrowing overshoots ahead of the 28 October Budget Borrowing from April to September was £97.8bn, £6bn above forecast. The 10-year gilt sits near 5.4%. The government borrowed £6bn more than forecast in the first half of the financial year, while the 10-year gilt yield sits close to its highest since 2008. 24 Oct 2026 · Europe · United Kingdom Politics → Link 4Cause France’s borrowing premium hits its highest since the euro debt crisis The 10-year spread over Germany reached about 147 bp on 5 October. Political deadlock and a 5.4% deficit have unsettled investors. Investors now demand about 1.4 percentage points more to lend to France than to Germany for ten years. Politics, not interest rates, explains the gap. 24 Oct 2026 · Europe · France
All news →

Sources and notes

  • Spread: French 10-year OAT yield minus German 10-year Bund yield, monthly readings. Daily high from market reports.
  • Debt and deficit: French government 2027 budget plan and EU figures, as reported in October 2026.
  • Euro crisis levels: historical 10-year yields for Italy and Spain against Germany, 2011–2012.
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