A deep dive into the Fed's ON RRP facility — how it works, why it surged to $2.5 trillion, how its drainage to near-zero fueled the rally, and what its depletion means for 2026 markets.
The Fed's Overnight Reverse Repo (ON RRP) facility allows eligible counterparties — primarily money market funds — to park cash at the Fed overnight in exchange for Treasury collateral. It was designed to set a floor on short-term rates, but in practice became a massive parking lot for excess cash.
Money parked in ON RRP is money NOT circulating in the economy. A high ON RRP balance represents sidelined liquidity. When ON RRP falls, that cash re-enters the financial system — flowing into T-bills, bank deposits, and ultimately risk assets. This is why ON RRP drainage is one of the most bullish liquidity signals.
In early 2021, ON RRP was near zero. By December 2022, it surged to $2.55 trillion — a perfect storm of excess liquidity from $4.7 trillion in QE plus zero short-term rates leaving money market funds nowhere else to earn yield.
The surge masked true liquidity conditions. While the Fed balance sheet was $8.9 trillion, $2.5 trillion was frozen at the Fed. The DollarLiquidity.com net liquidity formula (Fed Assets - TGA - ONRRP) captured this: actual circulating liquidity was only about $5.9 trillion, not the headline $8.9T.
Starting mid-2023, ON RRP began its historic decline: from $2.2T in June 2023 to $1T by November 2023, $500B by March 2024, and under $200B by late 2024. By early 2026, ON RRP is near $100 billion — essentially depleted.
The drainage was driven by the Treasury's massive T-bill issuance after the June 2023 debt ceiling resolution. Money market funds pulled cash from ON RRP to buy higher-yielding T-bills, releasing over $2 trillion back into the financial system over 18 months.
This ON RRP drainage was the single largest liquidity source during 2023-2024 — bigger than any Fed action. It explains how stocks rallied strongly while the Fed ran QT: ON RRP drainage was injecting liquidity faster than QT drained it. Net liquidity rose even as the Fed balance sheet shrank.
With ON RRP depleted, the market has lost its largest excess liquidity buffer. Previously, ON RRP acted as a shock absorber — releasing liquidity on demand to offset Treasury issuance, TGA rebuilds, and QT.
Now every dollar of Treasury issuance or TGA rebuild must come directly from bank reserves or private markets. The system is more sensitive to tightening shocks. For the Fed, ON RRP depletion signals QT is approaching its limits. In early 2025, the Fed slowed QT from $60B to $25B per month partly in response.
The ON RRP indicator uses "higher_worse" direction — rising ON RRP means liquidity absorption, falling means release. When ON RRP falls rapidly (z-score below -1.0), it's actively bullish for risk assets.
In 2026, with ON RRP near zero, the net liquidity formula simplifies to approximately: Fed Balance Sheet - TGA ≈ Net Liquidity. TGA movements and Fed balance sheet changes are now the primary drivers. Track them at DollarLiquidity.com to stay ahead of the next major liquidity shift.
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