Japan’s 5-year bond auction demand falls below 12-month average as BOJ rate hike pressure builds

Japan’s five-year government bond auction landed with a thud on Tuesday, posting a bid-to-cover ratio of 3.11. That’s the weakest showing since February and below the 12-month average, continuing a trend that has bond market watchers increasingly uncomfortable.

The five-year result follows an equally uninspiring 30-year JGB auction earlier this month, which posted a bid-to-cover ratio of 2.94. For context, the average for 30-year sales sits around 3.4. So demand for Japanese government debt is thinning at both the short and long end of the curve.

The Bank of Japan currently holds its policy rate at 0.75%, a number that would have seemed unthinkable just a couple of years ago when the country was still mired in negative interest rate territory. Markets are pricing in further hikes as the BOJ grapples with persistent inflation, a relatively new phenomenon for an economy that spent decades fighting deflation.

The expectation of additional rate increases is itself part of the problem for bond demand. Why lock in today’s yield on a five-year bond if you believe rates are heading higher? Rational buyers wait, demand weakens, and the cycle reinforces itself.

The yen carry trade connection

For years, investors borrowed cheaply in yen and deployed that capital into higher-yielding assets elsewhere, including risk assets like equities, corporate credit, and yes, Bitcoin. As the BOJ raises rates, that trade becomes less attractive. Borrowing costs in yen go up. The spread between Japanese rates and rates elsewhere narrows. Carry traders start unwinding positions, pulling capital out of the riskier assets they’d piled into.

We saw a vivid demonstration of this dynamic in mid-2024, when a surprise BOJ rate move triggered a violent unwinding of yen carry positions. Bitcoin dropped sharply alongside global equities in what amounted to a liquidity shock driven almost entirely by Japanese monetary policy.

What this means for crypto investors

A weaker yen, all else being equal, tends to be modestly supportive of dollar-denominated assets including Bitcoin. Japan has one of the most developed retail crypto markets in the world, and yen depreciation has historically correlated with upticks in Japanese Bitcoin buying.

On the other hand, a disorderly spike in JGB yields, the kind that might occur if auction demand continues deteriorating, could trigger exactly the kind of global risk-off event that hammers everything, crypto included. The 2024 carry trade unwind was a preview of that scenario.

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