AcctIDSource (FIX tag 660)

intFIX 4.4FIX 5.0 SP2

AcctIDSource (tag 660) is an int field defined in FIX 4.4 and FIX 5.0 SP2. It appears in 31 message types, always optionally. It is an enumerated field with 6 defined values.

At a glance

Tag: 660
Name: AcctIDSource
Datatype: int
Dialects: FIX 4.4 and FIX 5.0 SP2
Messages: 31
Valid values: 6

What the specification says

FIX 4.4

Used to identify the source of the Account (1) code. This is especially useful if the account is a new account that the Respondent may not have set up yet in their system.

FIX 5.0 SP2

Used to identify the source of the Account (1) code. This is especially useful if the account is a new account that the Respondent may not have setup yet in their system.

Descriptions are quoted from the FIX Orchestra sources under the Apache 2.0 licence.

A real message using tag 660

NewOrderSingle · FIX 4.4

Tag	Field	Wire value	Meaning
8	BeginString	FIX.4.4
9	BodyLength	117
35	MsgType	D	Order – Single
49	SenderCompID	BOARTEAM
56	TargetCompID	COUNTERPARTY
34	MsgSeqNum	2
52	SendingTime	20240101-12:00:00.000
11	ClOrdID	ORD-10042
660	AcctIDSource	1	BIC
54	Side	1	Buy
60	TransactTime	20240101-12:00:00.000
40	OrdType	1	Market
10	CheckSum	001

Edit and decode it yourself

Shown with | separators for readability. On the wire FIX uses SOH (0x01), an invisible control byte — and because BodyLength and CheckSum are computed over the actual bytes, the two forms have different checksums. Both are valid and both decode here.

Open in the full decoder →

Generated from the FIX 4.4 dictionary and verified at build time: it parses and validates with no issues. Open the decoder to try your own message.

Valid values

A value outside this list is not a parse error — the message still decodes — but validate() reports it as validate/value-not-in-enum.

Value	Meaning	Symbolic name
1	BIC	BIC
2	SID code	SID_CODE
3	TFM (GSPTA)	TFM
4	OMGEO (AlertID)	OMGEO
5	DTCC code	DTCC_CODE
99	Other (custom or proprietary)	OTHER

Where tag 660 appears

Requiredness is a property of the message, not of the field: the same tag can be optional in one message and conditionally required in another.

Message	MsgType	FIX 4.4	FIX 5.0 SP2	Where in the message
BidRequest	k	Optional	Optional	inside the BidCompReqGrp component
CrossOrderCancelReplaceRequest	t	Optional	Optional	inside the SideCrossOrdModGrp component
ExecutionReport	8	Optional	Optional	directly on the message body
MassQuote	i	Optional	Optional	directly on the message body
MassQuoteAcknowledgement	b	Optional	Optional	directly on the message body
MultilegOrderCancelReplace	AC	Optional	Optional	directly on the message body
NewOrderCross	s	Optional	Optional	inside the SideCrossOrdModGrp component
NewOrderList	E	Optional	Optional	inside the ListOrdGrp component
NewOrderMultileg	AB	Optional	Optional	directly on the message body
NewOrderSingle	D	Optional	Optional	directly on the message body
OrderCancelReject	9	Optional	Optional	directly on the message body
OrderCancelReplaceRequest	G	Optional	Optional	directly on the message body
OrderCancelRequest	F	Optional	Optional	directly on the message body
OrderMassStatusRequest	AF	Optional	Optional	directly on the message body
OrderStatusRequest	H	Optional	Optional	directly on the message body
PositionMaintenanceReport	AM	Optional	Optional	directly on the message body
PositionMaintenanceRequest	AL	Optional	Optional	directly on the message body
PositionReport	AP	Optional	Optional	directly on the message body
Quote	S	Optional	Optional	directly on the message body
QuoteCancel	Z	Optional	Optional	directly on the message body
QuoteRequest	R	Optional	Optional	inside the QuotReqGrp component
QuoteRequestReject	AG	Optional	Optional	inside the QuotReqRjctGrp component
QuoteResponse	AJ	Optional	Optional	directly on the message body
QuoteStatusReport	AI	Optional	Optional	directly on the message body
QuoteStatusRequest	a	Optional	Optional	directly on the message body
RegistrationInstructions	o	Optional	Optional	directly on the message body
RegistrationInstructionsResponse	p	Optional	Optional	directly on the message body
RequestForPositions	AN	Optional	Optional	directly on the message body
RequestForPositionsAck	AO	Optional	Optional	directly on the message body
TradeCaptureReport	AE	Optional	Optional	inside the TrdCapRptSideGrp component
TradeCaptureReportAck	AR	Optional	Optional	directly on the message body

Wire format

A whole number, optionally signed. Leading zeros are legal on the wire and are preserved in the raw value. @boarteam/fix parses the value as a number and reports parse/invalid-int when it does not lex as one; the raw string is kept either way.

Read tag 660 in TypeScript

decode.tsts

import { createFixEngine } from "@boarteam/fix";import { dictionary } from "@boarteam/fix-dict-fix44";const fix = createFixEngine(dictionary);const { message, issues } = fix.parse(raw);const acctIDSource = message.fields[660]?.raw;// e.g. "1" — BIC// The dictionary also carries the labels:const label = fix.dictionary  .fieldByTag(660)  ?.enumValues?.find((e) => e.value === acctIDSource)  ?.description;

Decode this in your own code

The same engine that produced the decoded example above is an Apache-2.0 npm package with zero runtime dependencies. It runs in Node and in the browser, and parse() returns problems as data instead of throwing.

npm i @boarteam/fix @boarteam/fix-dict-fix44

Try the decoder Source on GitHub