U.S. Treasury Expands T-Bill Issuance, Structurally Eroding the Fed's Policy Independence
nashnova research
T-bill share above the ceiling — why does it matter?
T-bills now make up 22.7% of total outstanding U.S. debt, above the Treasury's informal 20% cap.
Strip out the Fed's holdings and the ratio climbs to 24.1%.
This means → the Treasury's reliance on short-term borrowing has already overshot its own safety margin — and with deficits still widening, the ratio will keep rising.
How do T-bills turn into "shadow money"?
T-bills — government IOUs maturing in weeks to a year — are so short-dated and price-stable that the repo market accepts them at zero haircut.
The rehypothecation mechanism (pledging the same IOU as collateral multiple times) amplifies the effect: a 2021 academic study estimates that U.S. Treasury collateral was rehypothecated three to five times on average between 2015 and 2021.
In plain terms = each T-bill gets "photocopied" through the financial system; every copy creates another layer of liquidity, producing an effect remarkably close to central-bank money printing — this is what White calls "shadow money."
What does this have to do with inflation?
Historically, a rising T-bill share has tended to lead the onset of structural inflation.
White traces the transmission: more liquidity → higher asset prices → stronger wealth effect + artificially lower cost of capital → eventually pushes up the general price level.
This means → the inflation pressure is not a one-off policy mistake — it is the funding structure itself "auto-generating" inflation, and the mechanism runs as long as the T-bill share keeps climbing.
Why is it getting harder for the Fed to raise rates?
When a growing share of public debt is pegged to short-term rates, every Fed hike immediately increases the government's interest bill — effectively an automatic fiscal tightening.
That creates political pressure, making it harder for the Fed to act decisively when inflation picks up.
White states plainly: as the T-bill share keeps rising, "the Fed may no longer be able to set policy optimally to meet its inflation target."
Could the short-term funding market break?
Rising T-bill supply could push T-bill yields higher, tempting money-market funds to shift cash out of the repo market and into T-bills.
In plain terms = the short-term "working cash" in the system gets siphoned off by T-bills, thinning liquidity in the repo market — and the repo market is the daily blood supply of the entire financial system.
White flags a specific vulnerability: Fed reserves plus the reverse-repo facility (RRP) are already low relative to GDP, making a funding-market squeeze from this cash migration especially dangerous.
What is White's final verdict?
The Treasury itself grows more fragile: T-bill funding means more frequent auctions, and any rise in inflation expectations hits borrowing costs in real time.
The policy rate ends up carrying a dual mandate — monetary policy and fiscal stability at once — one interest rate trying to serve three goals: controlling inflation, maintaining financial stability, and keeping the fiscal trajectory sustainable.
White's conclusion is bleak: finding a single equilibrium rate that satisfies all three, he argues, is "perhaps simply an impossible task."
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