Fixed vs Variable Yield for Treasury: Locking a Rate Has Its Own Risk

This is the comparison the rest of the yield cluster points to. Once you know the instruments — a regulated tokenized T-bill, a utilization-driven DeFi lending position, a governance-set stablecoin savings rate — the choice that ties them together is whether to lock a rate or let it float. "Fixed" sounds like the safe option and "variable" the risky one; for a treasury the truth is the opposite framing. Fixed trades rate-compression risk for duration and exit risk; variable keeps flexibility but offers no certainty. This guide is that trade-off, not a contest over which number is bigger.

In short

• A Pendle PT held to maturity gives a fixed outcome: buy below par, redeem 1:1 at maturity; the variable yield is stripped into the YT.
• Fixed risk is duration plus exit: capital is committed for the term, early exit means selling the PT at market price rather than par, and there is opportunity cost if rates rise.
• Variable risk is compression plus uncertainty: the rate floats with utilization or governance and can fall sharply, though capital generally stays flexible.
• The decision is duration and rate-view, not "which number is bigger".
• Blending is common: a fixed tranche sized to a known horizon plus a variable tranche for flexibility, each policy-bounded.
• The accounting differs: a PT is a discounted maturity-dated instrument; a variable position is floating accrual — both jurisdiction-specific.

How a PT gives a fixed yield

A Pendle Principal Token (PT) is redeemable 1:1 for the underlying at maturity and trades at a discount before maturity (see Pendle PT/YT tracking). Buying a PT below par and holding it to maturity converts the discount into a known, fixed return over the period — the variable yield has been stripped off into the separate YT. So "fixed yield" here means locking the maturity outcome, not a contractual coupon, and it depends on holding to maturity and the underlying performing as expected.

The risk of locking fixed

Fixed is not the free safe choice — it trades one risk for others:

• duration: capital is tied up for the term;
• exit: leaving early means selling the PT at market price, not par;
• opportunity cost: if variable rates rise after you lock, you are committed at the lower rate.

Fixed removes rate-compression risk but adds the risk of being committed at the wrong rate or unable to exit at par (the duration dimension of the risk budget).

The risk of staying variable

Variable is not the safe default either:

• rate compression: a lending or savings rate floats with utilization or governance and can fall sharply, so the return is not plannable;
• but capital generally stays flexible, subject to withdrawal-liquidity.

Variable suits a treasury that values optionality and can tolerate an unknown rate; fixed suits one needing return certainty over a known horizon and able to commit the duration.

The actual decision

It is a duration and rate-view decision: match the term to a horizon you actually have, decide between certainty and flexibility, and treat rate direction as a secondary input. Many treasuries blend — a fixed tranche sized to a known horizon and a variable tranche for flexibility — each bounded by policy.

Accounting differs

A PT is a maturity-dated instrument valued at its discounted price until maturity, not par early (see Pendle PT/YT tracking); a variable lending or savings position accrues at a floating rate. Each classifies, values, and reconciles differently, and the tax treatment is jurisdiction-specific. The duration choice is also an accounting choice — confirm with an adviser.

Practical guidance

1. Frame it as duration + rate-view, not the bigger number.
2. Match a fixed term to a real horizon/liability — don't lock blindly.
3. Price the fixed exit risk — early exit is PT at market, not par.
4. Price the variable compression risk — the rate can fall sharply.
5. Consider a policy-bounded blend — fixed tranche + variable tranche.
6. Account per instrument (PT discounted-to-maturity vs floating accrual), jurisdiction-specific.

Choosing a tool that values both correctly

The two failure modes are par-valuing a PT before maturity and collapsing fixed and variable positions into one "yield" line. Tools like Cryptio and Request Finance can value a PT at its discounted price and a variable position at floating accrual, distinctly — but confirm it before trusting the books. Check that the tool:

• values a Pendle PT at its discounted market price until maturity, not at par;
• tracks variable lending and savings positions at their floating accrual, as a separate line;
• can report a fixed tranche and a variable tranche against their respective policy limits, rather than as one pooled figure.

A tool that carries a PT at par early, or merges the two, will overstate the fixed leg and obscure the duration decision the treasury actually made.

How Wag3s handles it

Wag3s Ledger values a Pendle PT at its discounted price until maturity, tracks variable lending and savings positions at floating accrual, and keeps each distinct with policy-tranche reporting and an audit trail, so the fixed-vs-variable duration choice is correctly accounted rather than mis-valued. See the Ledger product page and the Wag3s for accountants page.

Further reading

• Crypto Treasury Yield Strategy
• Pendle PT/YT Tracking
• DeFi Lending Yield for Treasury
• Stablecoin Savings-Rate Yield for Treasury
• Tokenized Treasury Bills for Yield
• Stablecoin Treasury Accounting Controls

Worked example: sizing a fixed tranche for a known horizon

A DAO treasury holds 2,000,000 USDC. It has three upcoming obligations:

• A €300,000 protocol grant payment due in approximately 14 months.
• Ongoing contributor payroll of roughly $50,000 per month (continuous).
• No other confirmed cash needs.

Fixed tranche sizing. The 14-month obligation is a known horizon. The treasury purchases Pendle PT-USDC with a 15-month maturity at a 6.8% implied yield (the PT trades at a discount equating to 6.8% annualised held to maturity). They size the position at $330,000 to cover the €300,000 grant with a small buffer, calculated as: €300,000 / current EUR/USD rate, plus a 5% buffer for exchange-rate movement.

• Capital committed: $330,000 for 15 months.
• Return at maturity: $330,000 × 1.068^(15/12) ≈ $355,400.
• Duration risk: if the treasury needs the $330,000 earlier, it exits PT at market price (which may be below $355,400 or even below $330,000 if implied yields have risen).

Variable tranche. The remaining $1,670,000 goes into a variable USDC lending position at a current rate of 5.2% APY. This funds the ongoing payroll with enough flexibility to withdraw without penalty. The rate can compress — if it drops to 3%, the treasury earns less but retains full flexibility.

Accounting implications. The PT is carried at discounted price, not par, until maturity. On the balance sheet it sits as a crypto-asset at its discounted carrying amount, not at $355,400. The variable lending position accrues daily at the floating rate. They are two separate line items, not one yield-generating pool.

The blend logic. Neither the fixed nor the variable tranche was sized by asking "which rate is bigger?" The fixed tranche was sized to a real future liability and a real duration the treasury can commit. The variable tranche absorbs everything else. The rate premium from the PT (6.8% vs 5.2%) is a secondary benefit, not the reason to lock.

Sources

• Pendle — Principal Token (PT): a PT is redeemable 1:1 for the accounting asset at maturity and trades at a discount before maturity because the yield component has been separated — so buying below par and holding to maturity produces the fixed outcome.
• Pendle — Yield Token (YT): the variable yield is streamed to the YT until maturity, which is what is "stripped off" when you hold a PT for fixed yield.
• The duration/exit trade-off, the variable rate-compression point, and the differing accounting follow from these mechanics and the lending/savings instruments covered in the linked articles, rather than a single additional citation.