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ExternalBenchmarkCurveName1Code

TONA Code: TONA

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TONA means tona in the ISO 20022 benchmark curve name code set. Tokyo Overnight Average Rate:

Code
TONA
ISO name
TONA
Status
Registered
Last updated
2024-12-03

Official definition

Tokyo Overnight Average Rate:

Interest rate benchmark - also known as a reference rate or a benchmark rate. It is a measure of the cost of borrowing in the Japanese yen unsecured overnight money market and is the near risk-free rate (RFR) for Japanese yen markets, administered and published by the Bank of Japan. It is sometimes referred to as “TONAR”. Bloomberg ticker is MUTKCALM, and ISDA ISDA FpML Floating rate index code is JPY-TONA.

Definition from the ISO 20022 External Code Sets, 2Q2026 (published 28 Aug 2026).

Messages and fields that use ExternalBenchmarkCurveName1Code

MessageElement path
auth.030TradData/Rpt/New/CmonTradData/CtrctData/UndrlygInstrm/Indx/Indx, TradData/Rpt/Mod/CmonTradData/CtrctData/UndrlygInstrm/Indx/Indx, TradData/Rpt/Err/CmonTradData/CtrctData/UndrlygInstrm/Indx/Indx, TradData/Rpt/Rvv/CmonTradData/CtrctData/UndrlygInstrm/Indx/Indx
auth.090AggtdPos/Rpt/PosSet/Dmnsns/UndrlygInstrm/Indx/Indx, AggtdPos/Rpt/CcyPosSet/Dmnsns/UndrlygInstrm/Indx/Indx
auth.091RcncltnSttstcs/Rpt/TxDtls/RcncltnRpt/MtchgCrit/TxMtchgCrit/IntrstFltgRateFrstLegCd/Val1, RcncltnSttstcs/Rpt/TxDtls/RcncltnRpt/MtchgCrit/TxMtchgCrit/IntrstFltgRateFrstLegCd/Val2, RcncltnSttstcs/Rpt/TxDtls/RcncltnRpt/MtchgCrit/TxMtchgCrit/IntrstFltgRateScndLegCd/Val1, RcncltnSttstcs/Rpt/TxDtls/RcncltnRpt/MtchgCrit/TxMtchgCrit/IntrstFltgRateScndLegCd/Val2
auth.107TradData/Stat/CmonTradData/CtrctData/UndrlygInstrm/Indx/Indx, TradData/Stat/CmonTradData/TxData/IntrstRate/FrstLeg/Fltg/Rate/Cd, TradData/Stat/CmonTradData/TxData/IntrstRate/ScndLeg/Fltg/Rate/Cd

TONA questions

What does TONA mean in ISO 20022?
TONA is TONA in the ExternalBenchmarkCurveName1Code code set: Tokyo Overnight Average Rate: Interest rate benchmark - also known as a reference rate or a benchmark rate. It is a measure of the cost of borrowing in the Japanese yen unsecured overnight money market and is the near risk-free rate (RFR) for Japanese yen markets, administered and published by the Bank of Japan. It is sometimes referred to as “TONAR”. Bloomberg ticker is MUTKCALM, and ISDA ISDA FpML Floating rate index code is JPY-TONA.
Where does TONA appear in a message?
For example in auth.030, element TradData/Rpt/New/CmonTradData/CtrctData/UndrlygInstrm/Indx/Indx.

All ExternalBenchmarkCurveName1Code codes · ISO 20022 code sets

The ISO 20022 code names and definitions on this page are reproduced from material published at iso20022.org under the ISO 20022 Intellectual Property Rights policy. This is not the official source: the up-to-date ISO 20022 standards and repository material are published only at iso20022.org. Explanations in our own words are by ZagTrader. ZagTrader is not affiliated with or endorsed by ISO or Swift.