Guide

Treasury notes (T-notes) explained

Harbor Capital's fixed-income sleeve was 100% T-bills through 2024: safe, liquid, state-tax exempt on interest. When the Fed began cutting short rates in late 2024, bill yields fell from 5.3% toward 4.1% within six months. Meanwhile the 10-year Treasury yield dropped from 4.6% to 3.9% — and intermediate note prices rallied 4–6% on top of coupon income. Harbor earned cash-like returns while missing the capital gain that defined the intermediate bond rally. The CIO called it “duration zero by accident”: they had government credit quality but no exposure to the part of the yield curve that actually moved.

Treasury notes (T-notes) are U.S. government securities with original maturities of 2, 3, 5, 7, or 10 years. Unlike T-bills, notes pay semiannual coupons at a fixed rate set at auction. They anchor the belly of the yield curve, fund most mortgage benchmarks (the 10-year), and give investors explicit duration — interest-rate sensitivity — without corporate credit risk. This guide covers note mechanics, on-the-run liquidity, duration math, portfolio roles, the Harbor Capital intermediate sleeve refactor, a technique decision table, pitfalls, and a checklist. Pair with duration and rate risk and bonds fundamentals for the full fixed-income stack.

T-note maturity taxonomy

The Treasury issues notes at five standard tenors. Each auction sets a coupon near the prevailing market yield; if the coupon equals the auction yield, the note prices at par ($100 per $100 face). If yields moved since the last comparable auction, the note may price at a premium or discount to par while the coupon stays fixed for life.

Tenor	Typical role	Duration (approx.)	Benchmark use
2-year	Front intermediate; Fed policy proxy	~1.9 years	Short-rate expectations
3-year	Bridge between bills and core intermediate	~2.8 years	Less liquid than 2s/5s
5-year	Core intermediate ladder building block	~4.6 years	Corporate 5y spread anchor
7-year	Extend duration without full 10y volatility	~6.3 years	Growing auction size
10-year	Global risk-free reference rate	~8.5 years	Mortgage rates, equity discount models

Notes differ from Treasury bonds (20- and 30-year maturities) and from TIPS, which adjust principal for CPI. Notes are nominal: they do not protect purchasing power if inflation accelerates (see TIPS for that sleeve).

Coupon mechanics and price-yield relationship

A newly issued 5-year note might carry a 4.25% coupon. The Treasury pays 2.125% of face value every six months until maturity, then returns principal. If market yields rise to 4.75% after issuance, the note's fixed coupon looks stingy — price falls below par so the yield to maturity (YTM) matches the market. If yields fall, price rises above par. This inverse relationship is the core of duration risk.

Accrued interest matters when you buy in the secondary market: you pay the seller for coupon days elapsed since the last payment. Broker screens show clean price (quoted) and settle with dirty price (clean + accrued). Ignoring accrued interest makes short-term return math look wrong.

Reinvestment of coupons

Semiannual coupons must be reinvested at prevailing rates. In a falling-rate environment, reinvestment yield declines but the note's price appreciates — the classic bond rally. In a rising-rate environment, coupons reinvest higher but mark-to-market losses can dominate. T-bills avoid reinvestment complexity because they are zero-coupon; notes trade that simplicity for intermediate yield and duration.

On-the-run vs off-the-run liquidity

The Treasury reopens each tenor on a regular schedule. The most recently auctioned issue is on-the-run — tightest bid-ask spreads, deepest dealer inventory, and the benchmark quoted on CNBC (“the 10-year yield” usually means the on-the-run 10-year note). Older issues with the same remaining maturity are off-the-run; they trade slightly wider and may offer a few basis points of extra yield for the same duration. Retail investors in broad ETFs rarely care; active managers sometimes harvest off-the-run richness.

Liquidity events matter: during March 2020 and the 2022 rate shock, even Treasuries saw spread widening and brief dislocations. Notes remained far more liquid than corporates or munis, which is why they are the collateral backbone of repo markets and the default flight-to-quality destination when equities sell off.

Duration, convexity, and yield-curve positioning

Modified duration estimates price change per 1% parallel yield move. A 5-year note near par might have duration near 4.6: a 1% yield drop implies roughly +4.6% price gain before coupons. The 10-year note carries roughly double the rate sensitivity of the 5-year — more bang per basis point of yield move, more drawdown when yields spike.

Investors rarely need a single note. Common structures:

Bullet maturity — one tenor matching a known liability (college tuition in five years).
Barbell — T-bills plus 10-year notes; convexity and flexibility without loading entirely on the 5-year point.
Ladder — 2/3/5/7/10 staggered maturities rolling into new auctions; smooths reinvestment and reduces timing bets.
Curve trade — overweight 5s vs 2s when the curve is steep; flattener when recession odds rise. Advanced; most retail sleeves skip outright curve bets.

Harbor Capital now targets portfolio duration of 4.5 years in its government sleeve — achieved with 40% 2–3 year notes, 40% 5-year notes, and 20% 7–10 year notes, rebalanced quarterly when duration drifts more than 0.3 years from target.

How to buy T-notes

Channel	Best for	Watch-outs
TreasuryDirect	Hold-to-maturity; no ongoing fees	Limited secondary selling; clunky UX for trading
Brokerage secondary market	Specific maturities; ladder construction	Markups on small lots; know clean vs dirty price
Intermediate Treasury ETF (IEF-style)	7–10 year exposure in one ticker	Duration drifts; not a maturity match
Broad government ETF (GOVT/AGG sleeve)	Core bond allocation simplicity	Mixes bills, notes, bonds; read fund duration
Target-maturity Treasury ETFs	Defined horizon with amortizing basket	Newer product; compare fees and AUM

Auction participation mirrors T-bills: noncompetitive bids get the clearing yield; competitive bids require yield limits. The Treasury publishes auction calendars months ahead — useful for ladder scheduling.

Harbor Capital intermediate sleeve refactor

The post-mortem on Harbor's bill-only sleeve identified three gaps:

No duration — zero capital gain when long rates fell; equity-bond correlation turned negative again in 2025.
Reinvestment cliff — 80% of bills matured within 13 weeks; rolling at falling auction yields compressed income faster than a laddered note portfolio would have.
Benchmark mismatch — liabilities (pension top-ups in 2029–2031) needed 5–7 year matching, not overnight cash.

The refactor split government holdings: 25% T-bills (liquidity buffer), 55% note ladder (2/5/10 weighted to 4.5-year duration), 20% TIPS for inflation linkage. Rebalancing rule: if 10-year yield rises more than 50 bps in a quarter, extend duration 0.5 years by shifting bill maturities into new 7-year auctions — systematic buy-high-yield, not market timing headlines.

Technique decision table

Approach	Best when	Weak when
T-notes (intermediate ladder)	Need government safety plus duration; multi-year horizon; falling or stable rates	Near-term spending; cannot tolerate NAV drawdown; rates rising fast
T-bills only	Maximum liquidity; rate-hike front end; cash parking	Need income smoothing; missing rally when long rates fall
Long Treasury bonds (20y+)	Deflation hedge; maximum duration bet	High volatility; liability mismatch if spending within 15 years
IG corporates	Extra yield over Treasuries; diversified credit	Flight-to-quality crises; need pure government collateral
TIPS	Inflation uncertainty; real return targeting	Deflation or negative real yields; tax complexity in taxable accounts
Individual notes held to maturity	Known cash-flow date; ignore interim mark-to-market	Small capital; poor diversification; liquidity before maturity

Common pitfalls

Confusing coupon with yield — a 2% coupon note can yield 4% if priced at a deep discount.
Ignoring duration when rates rise — “safe” Treasuries still draw down; 2022 proved it.
Chasing the 10-year only — concentrated rate bet; ladders reduce regret.
Forgetting accrued interest at purchase — skews short-term return calculations.
Assuming T-notes hedge equities always — correlation is regime-dependent; 2022 stocks and bonds fell together.
Tax surprise in taxable accounts — coupons are federal taxable annually; state exempt, unlike many corporates.
Using equity drawdown rules on bonds — selling notes at a loss to “stop out” crystallizes rate-timing mistakes.
ETF duration drift — as notes age, fund duration changes; read the fact sheet quarterly.

Portfolio checklist

Define liability horizon: match note maturities to spending dates.
Target portfolio duration explicitly (years, not vibes).
Choose ladder vs bullet vs ETF based on lot size and skill.
Check on-the-run vs off-the-run yield pickup if buying individual issues.
Model +100 bps rate shock on current holdings before sizing.
Keep T-bill buffer for 6–12 months liquidity separate from notes.
Reinvest coupons deliberately; do not let cash idle at 0%.
Review ETF effective duration and expense ratio annually.
Pair nominal notes with TIPS if inflation risk matters.
Document hold-to-maturity names vs tradeable sleeve.
Compare after-tax yield vs munis in high-bracket taxable accounts.
Rebalance when duration drifts more than 0.25–0.5 years from policy.

Key takeaways

T-notes are the intermediate government core — coupons, duration, and yield-curve exposure bills cannot provide.
Price and yield move inversely; duration quantifies the bet.
Ladders and explicit duration targets beat accidental cash-only sleeves.
On-the-run liquidity is excellent, but rate shocks still hurt mark-to-market.
Match instrument to liability — notes for years, bills for months.