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On-the-Run vs Off-the-Run Treasuries: The Liquidity Premium
Two Treasury securities can promise nearly identical cash flows and still trade at different yields. The newest issue almost always yields a touch less, and that small gap is one of the most studied features of the world's deepest bond market.
Key Takeaways
- The on-the-run security is the most recently auctioned Treasury of a given maturity; every earlier issue of that maturity becomes off-the-run once a newer one is sold.
- On-the-run notes trade richer (lower yield) because they are more liquid, easier to buy and sell in size with tighter bid-ask spreads.
- The yield gap between the two is the liquidity premium, typically a few basis points but wider during market stress.
- Off-the-run bonds pay you slightly more to hold something less liquid, which can suit buy-and-hold investors who do not need to trade frequently.
Key Takeaways
- The on-the-run security is the most recently auctioned Treasury of a given maturity; every earlier issue of that maturity becomes off-the-run once a newer one is sold.
- On-the-run notes trade richer (lower yield) because they are more liquid, easier to buy and sell in size with tighter bid-ask spreads.
- The yield gap between the two is the liquidity premium, typically a few basis points but wider during market stress.
- Off-the-run bonds pay you slightly more to hold something less liquid, which can suit buy-and-hold investors who do not need to trade frequently.
What It Is
On-the-run refers to the single most recently issued Treasury security for a specific maturity, such as the latest 2-year, 10-year, or 30-year. It is the benchmark that traders quote and that the financial press reports as "the 10-year yield."
Off-the-run describes every previously issued security of that maturity. When the Treasury auctions a new 10-year note each quarter, the old benchmark is bumped off the run and joins the large pool of seasoned issues. There is one on-the-run bond per maturity at any time and dozens of off-the-run bonds.
The two are close cousins: same issuer, same credit quality (backed by the U.S. government), and often nearly the same remaining maturity. What differs is how actively they trade.
The Intuition
Liquidity has value. The on-the-run note is where trading concentrates, so a buyer can move a large position quickly at a narrow spread. That convenience is worth paying for, and investors pay by accepting a slightly lower yield.
An off-the-run note offers the opposite trade: it changes hands less often and can cost more in spread to sell, so the market compensates holders with a slightly higher yield. Neither is "better." One rewards flexibility, the other rewards patience.
How It Works
The yield gap has two reinforcing sources.
First, trading demand. Dealers, hedgers, and index funds cluster in the on-the-run issue because it is the cheapest to enter and exit. Concentrated demand lifts its price and lowers its yield.
Second, repo specialness. Because on-the-run bonds are in constant demand as collateral, holders can lend them out in the repo market and borrow cash at a below-market rate. That financing advantage makes the bond worth holding even at a lower yield, widening the gap versus off-the-run paper that finances at ordinary "general collateral" rates.
The premium is not fixed. It compresses when markets are calm and widens sharply during stress, when everyone crowds into the most liquid instrument, a flight to liquidity that showed up dramatically in 1998 and again in March 2020.
Worked Example
Suppose the on-the-run 10-year note yields 4.20% and an off-the-run note maturing within weeks of it yields 4.28%. The liquidity premium here is 8 basis points (4.28 - 4.20).
To see that gap as price, use the approximation that price change is roughly minus modified duration times the change in yield. Take a modified duration of about 8 for a 10-year note:
- Price difference = 8 x 0.08% = 0.64% of par.
On a $10,000,000 face position, that is:
- $10,000,000 x 0.0064 = $64,000.
So an investor buying the on-the-run note pays roughly $64,000 more than for the near-identical off-the-run note, purely for superior liquidity. A pension fund that plans to hold to maturity and never trade might happily buy the off-the-run bond, bank the extra 8 basis points a year, and ignore the liquidity it does not need.
Common Mistakes
- Treating the gap as free money. The extra off-the-run yield is compensation for real illiquidity. If you must sell early in a stressed market, the wider bid-ask spread can erase the pickup.
- Ignoring repo specialness. Judging an on-the-run bond on yield alone misses the financing advantage that justifies its richer price.
- Assuming the premium is constant. It expands and contracts with market conditions; a spread that looks tiny today can blow out during a liquidity crunch.
- Confusing cheapness with credit risk. Off-the-run does not mean lower quality. Both are the same U.S. government obligation; the difference is liquidity, not default risk.
- Comparing mismatched maturities. A clean liquidity read requires two bonds with almost the same remaining life; otherwise the yield curve itself explains most of the gap.
Frequently Asked Questions
Q: What does on-the-run vs off-the-run mean for Treasuries? On-the-run is the most recently auctioned security for a given maturity, and off-the-run is every earlier issue of that maturity. The on-the-run bond is the actively traded benchmark; off-the-run bonds are the larger, less liquid pool.
Q: Why does the on-the-run vs off-the-run yield differ if the bonds are so similar? The difference is a liquidity premium. Traders concentrate in the on-the-run issue and it also finances cheaply in repo, so its price is bid up and its yield falls below comparable off-the-run bonds.
Q: Is one safer than the other? No. Both are backed by the U.S. government and carry the same credit risk. The distinction is purely about liquidity and how easily each can be traded.
Q: How large is the liquidity premium? Usually just a few basis points in normal conditions, but it can widen to tens of basis points during a flight to liquidity, as seen in 1998 and March 2020.
Q: Who should prefer off-the-run bonds? Buy-and-hold investors who do not need to trade often can capture the extra yield by holding off-the-run issues, accepting lower liquidity they are unlikely to use.
Sources
- Investopedia. "On the Run Treasuries." https://www.investopedia.com/terms/o/on-the-runtreasuries.asp
- Investopedia. "Off the Run Treasuries." https://www.investopedia.com/terms/o/off-the-runtreasuries.asp
- Federal Reserve Bank of New York. "Repo and Reverse Repo Agreements." https://www.newyorkfed.org/markets/domestic-market-operations/monetary-policy-implementation/repo-reverse-repo-agreements
- U.S. Department of the Treasury. "TreasuryDirect: Marketable Securities." https://www.treasurydirect.gov/marketable-securities/
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.