General Acronyms and Acronym Definitions Included in APS IRMs 8.20.5, 8.20.6, and 8.20.7
Internal Revenue Manual Part 8. Appeals · 2026-10-03 edition · updated 2026-10-04 · United States
Acronym
Acronym Definition
ABINT
Abatement of Interest
AC
TC 971 Action Code
ACA
Affordable Care Act
ACDS
Appeals Centralized Database System
ACM
Appeals Case Memorandum
ACS
Automated Collection System
ACT/DMI
Automated Computation Tool (Decision Modeling Inc.)
AGI
Adjusted Gross Income
AIVP
Appeals Inventory Validation Process
AMT
Alternative Minimum Tax
ANMF
Automated Non-Master File
AOC
Appeals Office Code
AOIC
Automated Offer In Compromise
AP
Appeals
Adjustment Pending
APO
Army or Air Force Post Office
APS
Account and Processing Support
ARDI
Accounts Receivables Dollar Inventory
ASED
Assessment Statute Expiration Date
ATCL
Appeals Team Case Leader
ATE
Appeals Technical Employee which includes:
Appeals Officer
Hearing Officer
Settlement Officer
Appeals Team Case Leader
ATM
Appeals Team Manager
ATT
Appeals TEFRA Team
AUR
Automated Underreporter
BMF
Business Master File
BOD
Business Operating Division
BS
Blocking Series
CAF
Centralized Authorization File
CAP
Collection Appeal Program
CAR
Case Activity Record
cc
Closing code associated with a Transaction Code (TC) e.g. TC 52X
CC
ACDS Closing Code
Command Code
CCISO
Cincinnati Centralized Innocent Spouse Operation
CCP
Compliance Case Processing
CDI
Corporate Data Initiative
CDP
Collection Due Process
CDP/EH
Collection Due Process Equivalent Hearing
CDPTD
Collection Due Process Timeliness Determination
CFO
Chief Financial Officer
CG
Computer Generated
CI
Criminal Investigation
CNC
Currently Not Collectable
CPM
Control Point Monitor
CRN
Credit Reference Number
CS
Case Support
CSED
Collection Statute Expiration Date
CTF
Campus TEFRA Function
CVPN
Civil Penalty
DATC
Doubt as to Collectability
DATL
Doubt as to Liability
DC
Disposal Code
DDIA
Direct Deposit Installment Agreement
DIMS
Docketed Information Management System
DKTNO
Docket Number
DLN
Document Locator Number
DO
District Office
DPC
Designated Payment Code
DPO
Diplomatic Post Office
E&G
Estate and Gift
E3210
Electronic 3210
EDL
Electronic Docket List
EEFax
Electronic Employee Fax number
EH
Equivalent Hearing
EIC
Earned Income Credit
EIN
Employer Identification Number
EITC
Earned Income Tax Credit
EMPL
Employment
EP/EO
Employee Plan Exempt Organization
EPSS
Electronic Products & Services Support
ES
Estate Tax
ESA
Coverdell Education Savings Accounts
EX
Excise
FBAR
Foreign Bank and Financial Account
FE
Field Examination
FLC
File Location Code
FOIA
Freedom of Information Act
FPAA
Final Partnership Administrative Adjustment
FPO
Fleet Post Office
FS
Filing Status
FTE
Flow Through Entity
FTM
Fast Track Mediation
FTS
Fast Track Settlement
HC
Hold Code
HOH
Head of Household
HSA
Health Savings Accounts
IA
Installment Agreement
IAT
Integrated Automation Tool
IDT
Identify Theft
IGM
Interim Guidance Memorandum
IMF
Individual MF
IMS
Issue Management System
INNSP
Innocent Spouse
INTL
International
IRA
Individual Retirement Account
IRA MF
Individual Retirement Account MF
IRC
Internal Revenue Code
IRM
Internal Revenue Manual
IRN
Item Reference Number
IRS
Internal Revenue Service
ISTS
Innocent Spouse Tracking System
ITIN
IRS Individual Taxpayer Identification Number
LOJ
Lack of Jurisdiction
MAAS
Manual Assessment (Literal used to identify a Quick Assessment)
MF
Master File
MMIA
Manually Monitored Installment Agreement
MEF
Modernized E-File
MFJ
Married Filing Joint
MFS
Married Filing Separate
MFT
Master File Tax
MOIC
Monitoring Offer In Compromise
MR
Manual Refund
MSA
Archer Medical Savings Accounts
NAP
National Account Profile
NF
Non-Filer
NMF
Non-Master File
NOD
Notice of Determination
NPS
Non-Petitioning Spouse
NPY
Non-Petitioned Year
NRS
Non-Requesting Spouse
NRU
Non-Returns Unit
NSD
No Source Document
OAR
Operations Assistance Request
OIC
Offer In Compromise
OMB
Organizational Mailbox
OS
Operations Support
PAM
Post Appeals Mediation
PC
Post Closing
Priority Code
PCS
Partnership Control System
PDC
Posting Delay Code
PDIA
Payroll Deduction Installment Agreement
PEAS
Processing Employee Automated System
PENAP
Penalty Appeal
PER
Potential Error Report (AQMS)
PICF
Partnership Investor Control File
PII
Potentially Identifiable Information
POA
Power of Attorney
POD
Post of Duty
PPIA
Partial Pay Installment Agreement
PR
Premature Referral
PRN
Penalty Reference Number
PS
Petitioning Spouse
PTM
APS Processing Team Manager
Q/A
Quick Assessment (Manual Assessment MAAS)
RAR
Revenue Agents Report
RDD
Return Due Date
REF
Reference
REP
Representative
RJ
Retained Jurisdiction
RFRTN
Reference Return
RRAP
Rapid Response Appeals Process
RRB
Railroad Retirement Board
RS
Requesting Spouse
RSD
Retained Source Document
RSED
Refund Statute Expiration Date
SB/SE
Small Business Self-Employed
SC
Source Code (If not used for Source Code, may be used to indicate Service Center (Campus) e.g. SC Claim)
SD
Source Document
SFR
Substitute For Return
SND
Statutory Notice of Deficiency
SPDER
Servicewide Policy, Directives and Electronic Research
SSN
Social Security Number
ST
Status
SUB
Substitute For Return (ACDS Statute Code)
TAS
Taxpayer Advocate Service
TBOR2
Taxpayer Bill of Rights 2
TC
Transaction Code
TCS
Tax Computation Specialist
TE
APS Tax Examiner
TE/GE
Tax Exempt Government Entities
TEFRA
Tax Equity and Fiscal Responsibility Administration
TETR
Telephone Excise Tax Refund
TFINV
TEFRA Investor
TFRP
Trust Fund Recovery Penalty
TIN
Taxpayer Identification Number
TIPRA
Tax Increase Prevention and Reconciliation Act of 2005
TL
Team Leader
TLCATS
Tax Litigation Counsel Automated Tracking System
TM
Team Member
TMP
Tax Matters Partner
TR
Transfer
TS
Taxpayer Services
TSA
Technical Services Advisory
TXI
Taxable Income
UNC
Unclaimed Notice
UND
Undeliverable Notice
USTC
United States Tax Court
VTS
Validation Tracking System
WH
Withholding
WHC
Withholding Compliance
WUNO
Workunit Number
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