Japan reportedly plans to finance economic security spending mainly through "bridging bonds", reducing the need for the issuance of deficit bonds, Nikkei reports citing sources

Funding choice rather than spending size is the operative detail here: shifting economic security outlays toward bridging or short-dated financing instruments changes the maturity composition of JGB supply, which in past episodes of this kind has relieved pressure at the long and super-long end of the curve where term premium has been most sensitive to deficit-bond issuance headlines. Bridging finance of this sort has historically been rolled or refinanced rather than retired, so the distinction between reduced deficit issuance now and reduced supply over time is the question desks will put to the funding plan; the precedent is that such instruments defer rather than eliminate duration supply. The relevant actors are the finance ministry's debt management office, whose issuance calendars have tended to telegraph shifts in coupon versus bill mix well in advance, and the central bank, whose purchase operations interact with the long end directly. Worth watching is the formal budget and issuance plan language, any adjustment to super-long auction sizes, and whether the reported plan survives the usual process of political negotiation, since early reports on funding composition have previously been softened before publication. As a sourced press report rather than an official announcement, the signal is directional on supply composition, not on totals.