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Publication 4393 (en-sp), What is an IRS ITIN Certifying Acceptance Agent? (English-Spanish), provides information for the tax return preparer.

Publication 3373, Disclosure of Information to Federal, State, and Local Agencies (DIFSLA) Handbook, notifies officers and employees of Federal, State, and local agencies that administer certain programs of procedures for obtaining Federal tax return information (FTI) from the Internal Revenue Service (IRS) through the DIFSLA program.

Claim credits and deductions when you file your tax return to lower your tax. Make sure you get all the credits and deductions you qualify for.

Information about Form W-9, Request for Taxpayer Identification Number (TIN) and Certification, including recent updates, related forms, and instructions on how to file. Form W-9 is used to provide a correct TIN to payers (or brokers) required to file information returns with IRS.

Information and technical guidance for software developers and transmitters who are interested in developing software for the Modernized e-File (MeF) Form 1041 for tax year (TY) 2024. Included are the Extensible Markup Language (XML) schemas, business rules, release memorandum, and specific instructions.

2025 valid XML schemas and business rules for 1120, 1120-F, 1120-H and 1120-S Modernized e-File (MeF)

2023 XML schemas and business rules for Form 1041 Modernized e-File (MeF)

Release memo for Form 1041 TY2024v4.1

Release memo for Form 1041 TY2023v7.2

1120x TY2025v1.0 release memo