The Japanese government bond sell-off hits Japan’s four major life insurance giants! $96 billion floating losses and forced impairment pressures converge

According to Golden Ten Data, Japan’s four major life insurance companies reported that, in the three months ending in June, their total unrealized losses on domestic bonds increased by 7%, highlighting the risks that surging yields bring to Japan’s insurance industry.

Quarterly financial reports for April to June show that Nippon Life Insurance, Dai-ichi Life Holdings, Sumitomo Life Insurance, and Meiji Yasuda Life Insurance saw the book losses of their bond holdings widen to 15.13 trillion yen (about $96 billion). Except for Nippon Life Insurance, the other three insurers all saw increases in their unrealized losses on bonds.

The decline in bond prices also triggered impairment accounting for some holdings; when a bond’s market value falls more than 50% below its purchase cost, asset impairment losses must be recognized. Nippon Life Insurance recorded an impairment loss of about 44 billion yen, while Meiji Yasuda Life Insurance reported an impairment loss of 25.3 billion yen.

Japanese life insurers typically hold Japanese government bonds and other debt securities to maturity to meet their insurance liabilities. However, if a large number of customers surrender their policies, insurers may have to sell these bonds to pay claims, which could put pressure on their profitability and investment portfolios.

A regulatory report released by Japan’s Financial Services Agency on August 6 stated that the expansion of unrealized bond losses is impacting insurers’ financial accounting and liquidity positions. The regulator is closely monitoring insurance companies’ investment activities.

Due to market concerns that Prime Minister Sanae Takaichi’s government may increase fiscal spending to support the economy, the yield on the 30-year Japanese government bond surpassed 4% in May, reaching an all-time high. These types of ultra-long-term government bonds are the main investment targets for life insurers.

The sell-off in Japanese government bonds in the second quarter reflects two mutually reinforcing pressures. The first is global inflation transmission—war-driven energy price increases are pushing up governments’ borrowing costs worldwide, which Japan cannot escape. The second is domestic fiscal concerns. Prime Minister Sanae Takaichi’s policies have raised market worries about Japan’s fiscal discipline.

Although the yield on Japan’s 30-year bond has recently declined, the Bank of Japan’s gradual rate hikes, the rise in global term premiums, and the government’s massive bond issuance plan are expected to continue exerting downward pressure on Japanese bond prices.

As the Bank of Japan gradually reduces its bond purchases, investors are increasingly concerned about one question: who will absorb the government’s growing debt? The outlook for stronger domestic demand has thus become especially important. According to previous calculations by Société Générale, Japan’s government pension investment fund (GPIF) could purchase up to an additional 12.3 trillion yen (about $76 billion) in Japanese government bonds without changing its benchmark asset allocation framework.

Société Générale’s estimate is based on a simple assumption: that GPIF increases its domestic bond allocation from 26.9% in March to the current cap of 31%. In the medium term, even just gradually raising its allocation within the permitted limits, GPIF could still unleash potential demand of $7.6–9 billion. However, Société Générale also warned that the fundamental problem of Japanese government bonds lies in supply-demand imbalance—“Stable auction supply and accelerated quantitative tightening increase the supply of bonds, while domestic investor demand is waning and global term premiums are rising.”