| ICCE, Order A Transcript PDF | ICCE-OAT |
| ID.me In-Person Verification Study PDF | |
| Identity and Tax Return Verification Service PDF | ID Verify |
| Identity Protection PIN PDF | IPPIN |
| Identity Theft Tax Refund Fraud Information Sharing PDF | IDTTRF-ISAC |
| Incident Management and Other DSL Treatment PDF | IMODT |
| Income and Family Size Verification PDF | IFSV |
| Income Verification Express Service Automation PDF | COVID IVES RPA |
| Indian Tribal Government Technical Time Reports PDF | ITGTTR |
| Individual Income Tax Credit Bot PDF | IITC Bot |
| Individual Master File PDF | IMF |
| Individual Master File Individual Tax Processing Engine PDF | IMF ITPE |
| Individual Return Transaction File On-line PDF | IRTFOL |
| IMF MOD EDP CADE2 Release 3.0.10 PDF | IMF MOD EDP CADE2 |
| Individual Master File Document Specific (IDOCSPEC) PDF | IDOCSPEC |
| Individual Taxpayer Identification Number Real-Time System PDF | ITIN-RTS |
| Information Reporting and Document Matching PDF | IRDM |
| Information Return Analysis System PDF | ISRR |
| Information Returns Database PDF | IRDB |
| Information Return Intake System Web Portal PDF | IRIS Web Portal |
| Information Returns Master File Modernization PDF | IRMF Mod |
| Information Returns Processing System PDF | IRPS |
| Information Returns Processing Paper Document PDF | IRPPD |
| Information Sharing and Reporting – Analytics and Reporting Migration PDF | ISR-A&R |
| Information Sharing & Reporting - Sharing PDF | ISR-S |
| Ingesting Casino Gaming Directory Data into Compliance Data Warehouse (CDW) PDF | ICGDD CDW |
| Insolvency Interface Program PDF | IIP |
| Insolvency Payment Monitoring Tool PDF | IPMT |
| Integrated Automation Technologies PDF | IAT |
| Integrated Collection System PDF | ICS |
| Integrated Collection System – Digital Storage Solution PDF | ICS DSS |
| Integrated Customer Communications Environment, IC (TRA) PDF | TRA |
| Integrated Data Retrieval System PDF | IDRS Mod |
| IDRS Transaction Code Searcher PDF | IDRS TCS |
| Integrated Production Model PDF | IPM |
| Integrated Production Model to EDP PDF | IDP EDP |
| Integrated Submission and Remittance Processing PDF | ISRP |
| Integrated Virtual Learning Platform/Adobe Connect PDF | IVLP |
| Integrated Virtual Learning Platform Project PDF | IVLPP |
| Interactive Tax Assistant/Interactive Tax Law Assistant PDF | ITA/ITLA |
| Interim Letter 6120c PDF | IL 6120c |
| Internal Identity & Access Management PDF | IIAM |
| International Business Machine Engineering Lifecycle PDF | ELM |
| International Business Machines (IBM) System z Main PDF | GSS-21 |
| International Compliance Management Model FATCA PDF | ICMM-FIR |
| International Correspondence Exam PDF | ICE |
| International Data Exchange Service PDF | IDES |
| International Web Applications PDF | INTLWEBAPPS |
| Inventory and Classification Database PDF | ICDP |
| Inventory Delivery System PDF | IDS |
| Inventory Reports RPA PDF | IR |
| Investigative Data Examination Application PDF | IDEA |
| Investigative Workstations PDF | IW |
| IP Camera System PDF | IP Camera |
| IRMOD IRIS Application Services PDF | IRIS |
| IRS AWS GovCloud NetHub Core Services PDF | ANCS |
| IRS Customer Relationship Management - eCITE - Salesforce PDF | IRSCRM |
| IRS Customer Relationship Management - Congressional Portal - Salesforce PDF | IRSCRM-IRSCP |
| IRS Customer Relationship Management - Phoenix - Salesforce PDF | IRSCRM-TAS |
| IRS Direct Pay PDF | IDP |
| IRS Integrated Enterprise Portals PDF | IEP/IEP Cloud |
| IRS2Go PDF | IRS2Go |
| IRWorks PDF | IRWorks |
| Issue Based Management Information System PDF | IBMIS |
| Issue Management System PDF | IMS |
| IUP-ER – Humanify Portal With VOSS PDF | IUP-ER - HPwV |
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