Japanese government bond yields have reached multi-decade peaks as investors express concern over the nation's fiscal trajectory and the Bank of Japan's capacity to manage inflation.

由於投資者對該國財政軌跡以及日本銀行管理通貨膨脹能力的擔憂，日本國債殖利率已達到數十年來的頂峰。

The benchmark 10-year Japanese Government Bond (JGB) yield ascended to 2.900 per cent on July 9, representing the highest level recorded since September 1996. This upward trajectory is characterized by a nine-day consecutive gain, the most prolonged sequence in 19 years. Concurrently, the yield curve has experienced significant steepening; the differential between 10-year and 2-year JGB yields expanded to 143 basis points, a peak not observed since 2004. This divergence suggests a market perception of heightened long-term price risk contrasted with diminished expectations for immediate short-term rate adjustments by the Bank of Japan (BOJ).

基準10年期日本國債（JGB）殖利率於7月9日上升至2.900%，為1996年9月以來最高紀錄。此上升趨勢呈現連續九日上漲，為19年來的最長紀錄。同時，殖利率曲線顯著陡峭化；10年期與2年期國債殖利率之差擴大至143個基點，為2004年以來的高點。這種分歧顯示市場感知到長期價格風險增加，而對日本銀行（BOJ）立即進行短期利率調整的預期則有所降低。

Institutional apprehension is primarily rooted in the fiscal framework promulgated by the Takaichi administration. The government's economic blueprint, which proposes combined public and private investments exceeding 370 trillion yen through fiscal 2040, has fostered perceptions that the administration views accommodative monetary policy as a prerequisite for growth. Consequently, market participants speculate that the BOJ may face political pressure to maintain low interest rates, potentially impeding the central bank's ability to respond to inflationary trends. In response to this volatility, the government is reportedly evaluating revisions to the blueprint's language to mitigate market instability.

機構之憂慮主因在於高市內閣頒佈的財政框架。政府的經濟藍圖建議在2040財政年度前，公私部門投資總額將超過370兆日圓，這使得市場認為政府將寬鬆的貨幣政策視為成長的前提。因此，市場參與者推測，日本銀行可能會面臨維持低利率的政治壓力，進而可能阻礙央行應對通膨趨勢的能力。據報導，針對此波動，政府正評估修訂藍圖措辭以緩解市場不穩定。

External macroeconomic variables have further exacerbated these domestic pressures. A surge in oil prices, precipitated by statements from U.S. President Donald Trump regarding the cessation of a tentative agreement with Iran, contributed to an increase in U.S. Treasury yields and rekindled global inflation concerns. While shorter-dated instruments, such as the five-year JGB, demonstrated relative firmness in recent auctions due to a flight to safety, the long end of the curve remains under pressure. The administration maintains that increased tax receipts and operational efficiencies will fund new expenditures, asserting that accelerated economic growth will eventually reduce the debt-to-GDP ratio, which currently exceeds 200 per cent.

外部總體經濟變數進一步加劇了這些國內壓力。美國總統川普針對終止與伊朗暫定協議的言論導致油價飆升，推高美國國債殖利率並再次引發全球通膨擔憂。雖然5年期國債等短天期工具在近期拍賣中因避險資金湧入而相對堅挺，但長端殖利率仍承受壓力。政府則堅持認為，增加的稅收與營運效率將足以支應新支出，並主張經濟成長加速最終將降低目前超過200%的債務對GDP比率。

JGB yields remain at historic highs as the market continues to weigh the Takaichi administration's spending ambitions against the Bank of Japan's monetary constraints.

由於市場持續權衡高市內閣的支出野心與日本銀行的貨幣約束，日本國債殖利率維持在歷史高位。