MiscFeeBasis (FIX tag 891)

intFIX 4.4

MiscFeeBasis (tag 891) is an int field defined in FIX 4.4. It appears in 9 message types, always optionally. It is an enumerated field with 3 defined values.

At a glance

Tag: 891
Name: MiscFeeBasis
Datatype: int
Dialects: FIX 4.4
Messages: 9
Valid values: 3

What the specification says

Defines the unit for a miscellaneous fee.

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

A real message using tag 891

ExecutionReport · FIX 4.4

Tag	Field	Wire value	Meaning
8	BeginString	FIX.4.4
9	BodyLength	179
35	MsgType	8	Execution Report
49	SenderCompID	BOARTEAM
56	TargetCompID	COUNTERPARTY
34	MsgSeqNum	2
52	SendingTime	20240101-12:00:00.000
37	OrderID	ORD-10042
17	ExecID	EXEC-88117
150	ExecType	0	New
39	OrdStatus	0	New
54	Side	1	Buy
151	LeavesQty	0
14	CumQty	1000000
6	AvgPx	1.09215
136	NoMiscFees2 entries	2	repeating group
137	MiscFeeAmt	125000.00
891	MiscFeeBasis	0	Absolute
137	MiscFeeAmt	125000.00
891	MiscFeeBasis	0	Absolute
10	CheckSum	107

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
0	Absolute	ABSOLUTE
1	Per unit	PER_UNIT
2	Percentage	PERCENTAGE

Where tag 891 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	Requiredness	Where in the message
AllocationInstruction	J	Optional	inside AllocGrp › MiscFeesGrp
AllocationReport	AS	Optional	inside AllocGrp › MiscFeesGrp
CollateralAssignment	AY	Optional	inside the MiscFeesGrp component
CollateralReport	BA	Optional	inside the MiscFeesGrp component
CollateralRequest	AX	Optional	inside the MiscFeesGrp component
CollateralResponse	AZ	Optional	inside the MiscFeesGrp component
Confirmation	AK	Optional	inside the MiscFeesGrp component
ExecutionReport	8	Optional	inside the MiscFeesGrp component
TradeCaptureReport	AE	Optional	inside TrdCapRptSideGrp › MiscFeesGrp

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 891 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 miscFeeBasis = message.fields[891]?.raw;// e.g. "0" — Absolute// The dictionary also carries the labels:const label = fix.dictionary  .fieldByTag(891)  ?.enumValues?.find((e) => e.value === miscFeeBasis)  ?.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