Tokyo Interbank Offered Rate (TIBOR)

The Tokyo Interbank Offered Rate (TIBOR) is a family of Japanese yen term interest-rate benchmarks administered by JBA TIBOR Administration (JBATA). Japanese Yen TIBOR represents reference banks’ estimates of prevailing rates for unsecured transactions between prime banks in Japan’s call market at 11:00 a.m. Tokyo time. It is published for five tenors: one week, one month, three months, six months, and 12 months.

TIBOR is not one rate and it is not the Bank of Japan’s policy rate. A contract must identify the correct TIBOR type, tenor, fixing date, day-count convention, reset rule, margin, and fallback. Euroyen TIBOR, a separate offshore-yen family, permanently ceased after its final publication on December 30, 2024; Japanese Yen TIBOR continues.

Key Takeaways

• Japanese Yen TIBOR remains active. JBATA publishes one-week, one-month, three-month, six-month, and 12-month settings.
• Euroyen TIBOR has ceased. Its five settings were last published on December 30, 2024.
• TIBOR is a term, unsecured, bank-credit-sensitive benchmark based on reference-bank submissions under a waterfall methodology.
• JBATA removes the two highest and two lowest submissions for each tenor and averages the remaining rates.
• A TIBOR-linked cash flow normally equals the selected fixing plus or minus a contractual spread, applied using the contract’s day-count and reset rules.
• TIBOR and the transaction-based overnight rate TONA measure different markets and are not interchangeable without contract and valuation adjustments.

What Japanese Yen TIBOR Measures

Japanese Yen TIBOR is intended to reflect prevailing unsecured call-market rates for prime-bank transactions. Reference banks determine their submissions under JBATA’s methodology hierarchy, which gives priority to relevant transaction data and permits expert judgment under defined conditions when direct market evidence is insufficient.

The published fixing is a standardized market benchmark, not a promise that every bank can borrow at that rate. An actual loan, deposit, bond, or derivative can trade above or below TIBOR because of borrower credit, collateral, tenor, liquidity, documentation, and dealer pricing.

How a TIBOR Reset Works

A floating-rate contract usually combines a benchmark and a fixed margin:

The fixing may be observed on or before the start of an interest period. Interest is then calculated using the notional or principal, the all-in rate, and the contract’s day-count fraction:

The governing documents decide which business-day calendar applies, what happens when a fixing is unavailable, whether a floor or cap applies, and when the resulting payment is due.

Worked Example

Assume a JPY 100 million loan resets for a 90-day period at three-month Japanese Yen TIBOR plus 1.20%. The observed TIBOR fixing is 0.65%, so the annualized all-in rate is:

Using an illustrative 90/365 day-count fraction, the period interest is approximately:

If the next comparable fixing is 1.05% and the margin remains 1.20%, the all-in rate becomes 2.25%. On the same simplified assumptions, period interest rises to about JPY 554,795, an increase of roughly JPY 98,630.

This example isolates benchmark movement. Actual payments can differ because of the exact number of days, holidays, rounding, floors, fees, compounding, payment delays, and contract-specific observation rules.

Where TIBOR Is Used

TIBOR can appear in:

• yen-denominated corporate and syndicated loans
• floating-rate notes
• interest rate swaps and basis swaps
• internal transfer-pricing, valuation, or hedge documentation where the benchmark is expressly specified
• legacy contracts that distinguish Japanese Yen TIBOR, Euroyen TIBOR, and JPY LIBOR

The presence of “yen benchmark” in a document is not enough. JPY LIBOR, Japanese Yen TIBOR, Euroyen TIBOR, and TONA have different administrators, methodologies, cessation histories, and fallback economics.

TIBOR Versus TONA

TONA is the Tokyo Overnight Average Rate, an overnight transaction-based benchmark. TIBOR is a forward-looking term benchmark with bank-credit and term-liquidity components.

A TONA-based fallback cannot reproduce TIBOR by changing the label alone. The spread adjustment, compounding convention, observation dates, and trigger language affect value and payments.

Japanese Yen TIBOR Versus Euroyen TIBOR

Before 2025, JBA TIBOR included two families:

• Japanese Yen TIBOR, reflecting the Japan unsecured call market
• Euroyen TIBOR, reflecting the Japan offshore market

JBATA permanently ceased all Euroyen TIBOR tenors after December 30, 2024. It did not cease Japanese Yen TIBOR at that time. Analysts reviewing a historical contract must therefore identify the full benchmark name rather than assuming every reference to “TIBOR” survived or ceased together.

For an old Euroyen TIBOR contract, check the fallback trigger, replacement benchmark, spread adjustment, calculation agent, consent requirements, and any statutory or protocol treatment. A generic statement that “TIBOR still exists” does not resolve a Euroyen TIBOR obligation.

Risks and Limitations

• Basis risk: A hedge can reference a different TIBOR tenor or a different yen benchmark from the underlying exposure.
• Reset risk: Borrowing cost changes when the benchmark resets even if the contractual margin is fixed.
• Submission risk: TIBOR uses reference-bank determinations, not a pure average of every executed market transaction.
• Credit and liquidity sensitivity: TIBOR can move differently from overnight near-risk-free rates.
• Fallback risk: Legacy wording may not clearly address cessation, non-representativeness, or temporary unavailability.
• Operational risk: Wrong fixing date, tenor, calendar, or day count can produce an incorrect payment.
• Licensing and data risk: Official benchmark data can be subject to administrator terms of use and redistribution restrictions.
• Historical-series risk: Japanese Yen TIBOR and discontinued Euroyen TIBOR must not be combined as one continuous economic series.

How to Evaluate a TIBOR-Linked Contract

1. Confirm whether the contract names Japanese Yen TIBOR or discontinued Euroyen TIBOR.
2. Identify the tenor, fixing source, observation date, publication time, and applicable calendar.
3. Reconcile the benchmark plus spread with any floor, cap, fee, or fallback adjustment.
4. Recalculate interest using the specified principal, day count, rounding, and payment dates.
5. Review temporary-unavailability, cessation, and non-representativeness triggers separately.
6. Compare the exposure with each hedge’s benchmark, tenor, reset timing, and notional profile.
7. Use the official JBATA rate and rules rather than an unsourced market-data page.

Official Sources

• JBA TIBOR Administration: About JBA TIBOR defines Japanese Yen TIBOR, its five tenors, underlying market, reference time, and trimmed-average calculation.
• JBA TIBOR Administration: Current rates and publication information provides the official publication channel and rate notices.
• JBA TIBOR Administration: Operational rules provides the governing methodology, code of conduct, contingency plan, and revision policies.
• JBA TIBOR Administration: Euroyen TIBOR cessation statement confirms the final December 30, 2024 publication and continuation of Japanese Yen TIBOR.

Related Terms

• TONA: Japan’s transaction-based overnight benchmark.
• Interbank Rate: The broader category of rates associated with bank funding markets.
• Benchmark Rate: A standardized reference used in pricing, valuation, and settlement.
• Interest Rate Swap: A derivative that can exchange fixed and TIBOR-linked cash flows.
• Basis Point: One hundredth of one percentage point, used to measure benchmark and margin changes.
• LIBOR: A separate discontinued or nonrepresentative benchmark family that should not be confused with TIBOR.

FAQs

This article provides general financial education, not personalized investment, borrowing, accounting, tax, or legal advice. The governing contract and current JBATA publications control a specific TIBOR-linked obligation.