Overnight Reverse Repo Facility ON RRP: How It Works

Key Takeaways

• The ON RRP rate is set by the FOMC alongside IORB; together they form the floor corridor controlling the fed funds rate in a reserves-abundant system.
• Daily aggregate usage surged from near zero in early 2021 to roughly $2.5 trillion in late 2022, then drained back toward zero through 2023 and 2024 as T-bill supply and QT absorbed excess cash.
• Eligible counterparties are narrowly defined: primary dealers, government-only money market funds, GSEs, and select domestic banks, not hedge funds or corporate treasurers.
• High ON RRP balances signal thin private repo demand or scarce bill supply; they are a plumbing story, not a gauge of economic conditions.

What It Is

When the Fed conducts a reverse repo, it sells a Treasury security to a counterparty today and agrees to buy it back tomorrow at a slightly higher price. The price difference is the interest paid. From the counterparty's perspective it is a fully collateralized overnight loan to the central bank.

Eligible counterparties include primary dealers, government-only money market funds, government-sponsored enterprises such as the Federal Home Loan Banks, and a few domestic banks. The list is narrow by design: the facility targets the institutions that set the floor in the broader money market. The rate is administered by the Board of Governors alongside interest on reserve balances (IORB), and both are adjusted at FOMC meetings in parallel with the federal funds target range.

The Intuition

In a reserves-abundant system, the fed funds rate cannot be controlled by adjusting reserve scarcity the way the pre-2008 framework did. Instead, the Fed uses two administered rates. IORB pays banks for holding reserves. ON RRP pays non-banks (especially money market funds) for lending cash to the Fed. Together they form a floor corridor: banks will not lend reserves below IORB, and non-banks will not lend below the ON RRP rate.

Without a floor for non-banks, money funds flush with cash could lend in repo markets at rates well below IORB, dragging the whole complex lower. ON RRP solves that by giving them a risk-free alternative.

How It Works

Operations are conducted daily by the Open Market Trading Desk at the New York Fed. Counterparties submit bids at the announced rate up to per-counterparty and aggregate caps. As of the 2021 cap increase, most eligible participants can lend up to $160 billion per day. Settlement is same-day, with unwind the next business day.

The pricing line is simple:

ON RRP rate  = administered rate set by FOMC (in the policy implementation note)
IORB rate    = administered rate set by Fed Board
Fed funds target = FOMC range, e.g. 4.25 percent to 4.50 percent

Usage followed a sharp arc in this cycle. Take-up was effectively zero in early 2021. As the Treasury drew down its cash account and the Fed continued asset purchases, reserves ballooned and usage surged. Daily aggregate balances peaked at roughly $2.5 trillion in late 2022 and early 2023. Through 2023 and 2024, Treasury bill issuance, QT, and the TGA refill drained that cushion back toward zero.

Worked Example

Suppose IORB is 4.40 percent and the ON RRP rate is 4.30 percent. A government-only money market fund has $5 billion to place overnight. Triparty repo with a dealer is offered at 4.28 percent because dealer demand is soft and bill supply is heavy.

Rather than accept 4.28 percent in private repo, the fund submits a $5 billion bid to ON RRP at 4.30 percent. The fund earns roughly $597,000 of overnight interest at no counterparty risk. Multiply that decision across 80 or 100 money funds, and the aggregate ON RRP take-up is what keeps private repo rates from drifting meaningfully below 4.30 percent. If they do drift below, the facility absorbs more cash until they do not.

Common Mistakes

1. Reading ON RRP balances as a growth indicator. A high balance means money funds have parked cash at the Fed, often because private alternatives pay less or bill supply is thin. It is a plumbing story, not a signal about real economic activity.
2. Confusing reverse repo with repo. In a Fed repo operation, the Fed lends cash and takes in collateral, adding reserves. In a reverse repo operation, the Fed borrows cash and delivers collateral, draining reserves. Counterparties treat them as opposite trades, not variations on the same one.
3. Assuming the floor always holds perfectly. The ON RRP is a soft floor. In periods of intense collateral scarcity, dealers or funds may accept rates a few basis points below the facility rate because of balance-sheet or settlement constraints.
4. Ignoring per-counterparty caps. At very high aggregate demand, individual money funds can hit their $160 billion limit and be forced into other channels, which has contributed to isolated repo-rate spikes.
5. Confusing ON RRP with the Foreign Repo Pool. The Foreign Repo Pool is a separate service for foreign official institutions. It sits in a different line of the H.4.1 release and serves a different purpose.

Frequently Asked Questions

What is the overnight reverse repo facility (ON RRP)? The ON RRP is a standing Fed tool that lets eligible counterparties, primarily government money market funds, primary dealers, and GSEs, lend cash to the Fed overnight in exchange for Treasury collateral at an administered rate. It sets a soft floor under money market rates by giving non-banks a guaranteed alternative to private repo at or above the ON RRP rate.

Why did ON RRP balances surge to $2.5 trillion in 2022? The Fed's pandemic-era asset purchases flooded the system with reserves while Treasury simultaneously drew down its cash account, releasing even more cash into money markets. Money market funds had far more cash than private short-term instruments could absorb, so they parked the excess at the ON RRP facility rather than accept below-floor rates in private repo.

How does the ON RRP set a floor on money market rates? If private repo rates fall below the ON RRP rate, money funds simply redirect cash to the Fed's facility instead. That withdrawal from private markets pushes private rates back up. The facility works because eligible counterparties have a credible outside option, and use it in volume when private alternatives are less attractive.

What caused ON RRP balances to drain back toward zero by 2024? Three forces drew cash away from ON RRP: Treasury issued a large volume of T-bills after the 2023 debt-ceiling resolution, which gave money funds a higher-yielding alternative; the Fed's QT reduced total reserves; and the TGA rebuild absorbed excess liquidity. Together these shifts made private instruments more attractive than the facility rate.

What is the difference between IORB and the ON RRP rate? Interest on Reserve Balances (IORB) is paid to banks holding reserves at the Fed; the ON RRP rate is paid to non-bank counterparties lending cash to the Fed. Banks have access to IORB and typically set the upper end of the floor corridor, while the ON RRP anchors the lower end for entities that cannot hold reserves directly. Both rates are adjusted at FOMC meetings.

Sources

1. Federal Reserve Bank of New York. "Reverse Repurchase Agreement Operations FAQ." https://www.newyorkfed.org/markets/rrp_faq
2. Federal Reserve Board. "Policy Normalization Principles and Plans." https://www.federalreserve.gov/monetarypolicy/policy-normalization.htm
3. Federal Reserve Board. "FEDS Notes." https://www.federalreserve.gov/econres/notes/feds-notes/
4. Federal Reserve Bank of New York. "Reverse Repo Operations." https://www.newyorkfed.org/markets/desk-operations/reverse-repo

Disclaimer

This article is educational content only and is not financial advice. Nothing here is a recommendation to buy, sell, or hold any security. Consult a licensed advisor before making investment decisions.