Japan bond auction faces scrutiny as yields rise, government budget swells

An auction of Japanese government bonds on Tuesday stands as a key test of investor appetite as yields climb to a three-decade high, putting scrutiny on the prime minister's record spending plans and the Bank of Japan's path toward higher interest rates.

The 10-year JGB yield JP10YTN=JBTC is marching closer to the psychological threshold of 3%, and the auction's outcome could affect Japan's funding costs and global bond markets as investors gauge whether yields have further room to rise.

Budget requests from ministries and agencies for fiscal 2027 are expected to reach 140 trillion yen ($876.2 billion), far beyond last year's all-time high of 122.3 trillion yen.

Japan's surge in borrowing costs is increasingly being viewed as a cautionary example for other heavily indebted nations. Yields in the U.S. and Europe have also recently touched multi-year highs on similar concerns over higher central bank rates, inflation, growing deficits and debt loads.