Concerns over France’s sovereign debt mounted on Wednesday, October 21, 2026, when the country’s 10-year borrowing cost touched 5% for the first time since 2002, as reported by CNBC.

French yields hit 5%, and Italian BTPs are in the frame

Watch the rest of the eurozone’s government bonds closely, starting with Italy’s BTPs (Buoni del Tesoro Poliennali, the country’s benchmark multi-year government bonds), as fears grow that the slide in OATs (Obligations Assimilables du Trésor, France’s equivalent benchmark issue) could spill into the whole bloc’s sovereign debt market.

For now, Bloomberg data show the 10-year BTP yield up 4 basis points at 4.56%.

The spike in French yields came at around 11:14 a.m. Italian time, according to Reuters, when the 10-year OAT yield jumped as high as 5.002% before slipping back below that psychological threshold.

The France-Germany spread at 157 basis points, the widest since 2011: why investors are fleeing OATs

Keep an eye on the France-Germany spread as well — the OAT-Bund spread, which measures the gap between French yields and those on German Bunds, the eurozone’s benchmark safe asset. Driven by the jump in French yields, it widened to 157 basis points, closing in on levels last seen in 2011.

Among the reasons investors keep walking away from French paper are doubts about the Paris government’s ability to get its 2027 budget approved, a bill designed to bring down the country’s high public deficit.

Weighing on French government bonds, inevitably, are also the uncertainty surrounding next year’s elections, which are shaping up to be unusually hard-fought, and the widespread protests currently disrupting the country.

With German Bund yields also rising, though by less than Italian yields, the 10-year BTP-Bund spread stands at 115 basis points.

How could the OAT selloff spread to Italian BTPs?

As for the real effect the surge in OAT yields may have on investors holding BTPs — the potential contagion, in other words — it is worth stressing that the move does not necessarily translate into higher yields on Italian government bonds.

On some occasions in the past, in fact, the decision by certain investors to dump French sovereign bonds has worked in Italy’s favor, with its debt perceived as the safer option.

That said, at a time when the entire global bond market has taken heavy hits over the course of 2026, a further unwinding of OAT positions could push investors to cut their exposure to European sovereign debt across the board.

For BTPs already in a portfolio, higher Italian yields mean the market price of those bonds falls, but the fixed coupons stay the same.

For new purchases, by contrast, rising yields allow investors to buy bonds at potentially more attractive prices, since those prices have come down — while exposing them to the risk of further declines.

Editor’s note

This article was originally published in Italian on money.it by Laura Naka Antonelli on October 21, 2026 as «Alert debito Francia, rendimenti OAT a 10 anni volano al 5% per la prima volta dal 2002. Che fanno i BTP?». It has been translated and adapted for an international audience by the Money.it International desk.