STRIPS: Separate Trading of Registered Interest and Principal

A Treasury STRIP (Separate Trading of Registered Interest and Principal) is a zero-coupon bond created by stripping a conventional Treasury bond into its component interest and principal payments. The US Treasury does not issue STRIPS directly; dealers acquire Treasury bonds, deposit them with a custodian, and issue receipts against the individual cash flows—each of which trades as a standalone security that matures at face value with no interim coupon.

How STRIPS Are Created

A dealer buys a Treasury bond—say, a 30-year bond paying 4% annually—and deposits it with the Federal Reserve’s book-entry system. The dealer then issues separate claims against each coupon payment and the principal repayment. If the bond had 60 future coupons plus one principal payment, the dealer could issue 61 securities: 60 coupon STRIPS and 1 principal STRIP. Each is registered with the SEC and trades independently, even though all of them are backed by a single underlying Treasury bond held in custody.

This separation happens in the secondary market, not at issuance. The Treasury department has no role in creating STRIPS—it is entirely a dealer operation. Multiple dealers can strip the same Treasury, so the same maturity date and cash amount may exist in multiple STRIPS forms, each with a slightly different price and yield depending on supply and demand.

Valuation and Price Dynamics

A STRIP is a zero-coupon bond, so it trades at a large discount to par. If a STRIP matures in 20 years and pays $1,000 at maturity, and the prevailing yield is 4%, the STRIP will trade at approximately $456 per $1,000 face value. Because there are no interim coupons, all value accrues from the difference between the discounted purchase price and the redemption at par.

Duration for a STRIP equals its time to maturity exactly—a 30-year STRIP has duration of 30 years. This extreme duration makes STRIPS highly sensitive to interest-rate moves. A 1% rise in yields cuts a 30-year STRIP’s price by roughly 30%, while a 1% fall raises it by 30%. This sensitivity is both an opportunity for traders betting on yield moves and a source of volatility for buy-and-hold investors.

The value of a STRIP depends on the spot interest rate (the yield curve) at its maturity point. Investors primarily buy STRIPS to lock in a known future sum: a dollar deposited today in a STRIP maturing at a specific date grows to a predictable amount, with no reinvestment risk. This appeal is strongest in declining-rate environments or when an investor wants to match a known future liability—such as funding a tuition bill in 15 years.

Phantom Income and Tax Inefficiency

STRIPS generate what is colloquially called “phantom income”—taxable gains on which no cash has yet been received. An investor who buys a STRIP for $456 maturing in 20 years faces a $544 gain, but the gain is not realized all at once; instead, the accrued interest builds each year as the STRIP’s implicit interest accrues.

Under US tax law, the bondholder must declare this accrual as ordinary income each year, even though no coupon is paid. A $456 STRIP with a 4% implicit yield accrues roughly $18.24 in year one, taxable at the buyer’s ordinary income rate (up to 37% for federal income tax). For a high-income investor in a 37% bracket, the annual tax bill on the accrual is about $6.75, representing a real annual cash drain despite receiving no cash from the investment.

This tax treatment makes STRIPS inefficient in taxable accounts, especially for individual investors. They are most suitable for tax-deferred accounts (401k plans, IRAs, pension funds, endowments) where the phantom income does not trigger an annual tax bill.

Who Uses STRIPS and Why

Institutional investors and pension funds are the primary holders. A pension fund with a known obligation to pay $50 million in benefits in 15 years can buy STRIPS maturing in exactly 15 years, eliminating reinvestment risk and matching the timing of the liability to the asset precisely. This strategy is called liability immunization.

Insurance companies buy long-dated STRIPS to back life insurance reserves and annuity obligations.

Bond traders exploit STRIPS for relative-value trading. A dealer might identify a Treasury bond trading richly in the cash market while the equivalent portfolio of STRIPS derived from that bond trades cheaply, then arbitrage the gap.

Individual retail investors use STRIPS in small quantities for education savings (within college savings plans) or to build a bond ladder of predictable future sums. However, the phantom-income tax burden limits their appeal outside retirement accounts.

STRIPS vs. I-Bonds and Regular Treasuries

Unlike Treasury bills (which are true short-term zero-coupon instruments issued by the Treasury directly), STRIPS are created in the secondary market. Unlike I-Bonds (inflation-adjusted Treasuries), STRIPS have no inflation protection—their real value erodes with inflation, though their nominal maturity value is guaranteed.

A conventional Treasury bond’s holder receives interest in hand every six months and faces a lower tax burden on annual coupons (treated as ordinary income, not phantom accrual). A STRIPS holder defers all interest receipt until maturity but accrues tax liability annually.

Reconstitution

A dealer can reverse the strip operation by assembling individual STRIPS back into a conventional Treasury bond, a process called reconstitution. If the conventional bond trades at a premium relative to the sum of its component STRIPS, dealers can profit by reconstituting the bond, selling it, and pocketing the difference. This arbitrage activity helps prevent the Treasury market from fragmenting—it keeps the value of a Treasury bond roughly equal to the sum of its STRIPS parts.

Risks and Considerations

Interest-rate risk dominates. A STRIP’s price swings violently with yields. If rates spike after purchase, the STRIP’s market value falls sharply, though the holder who holds to maturity still receives par.

Opportunity cost arises if rates rise sharply after purchase; the investor has locked in a low return and cannot easily reallocate without realizing a loss.

Illiquidity in some maturities. While principal and coupon STRIPS for widely-held Treasury bonds trade actively, less-common maturities can be harder to sell at a tight bid-ask spread.

Credit risk is minimal—all STRIPS backed by US Treasuries carry the full faith and credit of the federal government.

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