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Takaichi's fiscal blueprint, dubbed "Sanaenomics," includes a ¥21.3 trillion stimulus package (~3.7% of GDP) focused on defense, AI, semiconductors, and cost-of-living support, along with a proposed two-year suspension of the 8% consumption tax on food . These signals, combined with a weak 10-year JGB auction that reinforced concerns over rising government borrowing, directly pushed yields toward 2.8% . Investors have been "red-flagging" Takaichi's budget remarks since early 2026, according to CNBC . BNP Paribas economists predicted that Takaichi's expansionary fiscal policies could further drive inflation and accelerate BOJ rate hikes .

BOJ's June 2026 Rate Hike to 1%: A Landmark Tightening Step

On June 15–16, 2026, the Bank of Japan raised its benchmark policy rate by 25 basis points to 1.0% — the highest level since 1995 — in a landmark normalization step . The vote was 7-1, and the decision was carried out even with Governor Kazuo Ueda hospitalized .

The BOJ's statement signaled readiness to tighten further, with the June meeting summary showing some board members called for even faster tightening to combat inflation risks from the Iran-war-induced energy shock . This "higher-for-longer" signal repriced the entire JGB curve upward . The central bank also decided to pause its bond-buying taper from April 2027 onward, effectively stepping back as the marginal buyer of JGBs . This removal of the BOJ's implicit backstop forced the market to absorb far greater supply on its own, amplifying yield volatility .

Yields Rising Across All Maturities

The selloff was not limited to the 10-year note. The 20-year JGB yield climbed to 3.511% on May 13, its highest since 1996 . The 40-year bond yield spiked 27 basis points to 4.215% in January 2026, trading at its highest level since that maturity was introduced in 2007 . The 30-year yield also surged past 4% in late May . This across-the-curve repricing reflects a structural loss of Japan's role as the world's low-yield anchor .

BNP Paribas's Terminal Rate Forecast of 2.5%

On July 3, 2026 — the same day the 10-year yield hit 2.81% — BNP Paribas revised its Japan terminal interest rate forecast from 2.0% to 2.5% . Economist Ryutaro Kono expects the BOJ to hike roughly once every four to five months, reaching 1.25% by end-2026, 2.0% by end-2027, and 2.5% by September 2028 . This revised terminal rate expectation has further compressed the bond market, as investors price in a much higher eventual policy rate than previously assumed.

Corporate Shift to Convertible Bonds

Specific convertible bond offerings by major companies such as Kawasaki Heavy Industries and Nippon Steel could not be independently verified from the available sourced material. However, the broader pattern — rising JGB yields making conventional corporate debt more expensive, pushing companies toward equity-linked instruments — is consistent with the tightening landscape described by all sources.

The Causal Chain That Broke the Bond Market

• Takaichi's fiscal expansion plans (record budgets, tax-cut proposals) raise the supply of new JGB issuance and the default-risk premium on Japan's already massive debt stock .
• The BOJ's June rate hike and explicit signal of further tightening reprice the risk-free rate across all maturities .
• The BOJ's taper of bond purchases removes the largest structural buyer, forcing the private market to absorb supply at higher yields .
• BNP Paribas's 2.5% terminal rate forecast extends the horizon for rate increases, pulling forward future yield expectations into current pricing .
• The cumulative effect is Japan's worst bond selloff in nearly 30 years, with yields hitting levels not seen since before the country's "lost decades" of deflation .