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Yen Breaks 150 After BoJ Holds, No Warning on Weakness
USD/JPY broke above 150 after the BoJ left rates at 0.25% and lowered inflation forecasts. The real yield differential with US Treasuries is the key driver. Next catalyst: US CPI.
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The Japanese yen weakened against the dollar this morning after the Bank of Japan left its policy rate unchanged at 0.25%. The USD/JPY pair pushed through the 150.00 handle in early Asia trade, a level that had held as resistance for most of the prior week. Governor Kazuo Ueda offered no explicit warning on yen weakness during his press conference, effectively giving the market a green light to test that line.
The simple read is that the BoJ did nothing, so the yen sold off. The better market read is more specific. The real yield differential between US Treasuries and Japanese government bonds has widened by roughly 15 basis points since the last BoJ meeting. That move was driven entirely by the repricing of Federal Reserve rate expectations after stronger-than-expected US payrolls data. The BoJ's inaction locks in that differential for at least another six weeks, which is the core mechanism driving the pair higher.
Why the 150.00 Break Matters for USD/JPY
The 150.00 level is not a round-number zone. It marks the upper boundary of the Ministry of Finance's perceived intervention threshold, based on the pattern of actual FX intervention in September and October of last year. The BoJ's decision to hold, combined with Ueda's press conference language that offered no explicit warning on yen weakness, effectively gives the market a green light to test that line.
Positioning data from the latest CFTC Commitments of Traders report shows leveraged funds have been net short the yen since early January. The short base is still well below the extremes seen before the October intervention. That suggests room for further yen weakness before the carry trade becomes crowded enough to trigger a sharp reversal.