Find IRS forms, instructions, publications, and notices for prior years back to 1864.

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Instruction SS-4 Instructions for Form SS-4, Application for Employer Identification Number 2016
Instruction SS-4 Instructions for Form SS-4, Application for Employer Identification Number 2011
Instruction SS-4 Instructions for Form SS-4, Application for Employer Identification Number 2010
Instruction SS-4 Instructions for Form SS-4, Application for Employer Identification Number 2009
Instruction SS-4 Instructions for Form SS-4, Application for Employer Identification Number 2007
Instruction SS-4 Instructions for Form SS-4, Application for Employer Identification Number 2006
Instruction SS-4 Instructions for Form SS-4, Application for Employer Identification Number 2003
Instruction SS-4 Instructions for Form SS-4, Application for Employer Identification Number 2001
Instruction SS-4 Instructions for Form SS-4, Application for Employer Identification Number 1985
Form SS-4 (PR) Application for Employer Identification Number (EIN) (Puerto Rico Version) 2020
Form SS-4 (PR) Solicitud de Numero de Identificacion Patronal (EIN) 2017
Form SS-4 (PR) Solicitud de Numero de Identificacion Patronal (EIN) 2010
Instruction SS-4 (PR) Instructions for Form SS-4 (PR), Application for Employer Identification Number (Puerto Rico Version) 2020
Instruction SS-4 (PR) Instructions for Form SS-4, Application for Employer Identification Number (EIN) (Puerto Rico Version) 2017
Instruction SS-4 (PR) Instructions for Form SS-4, Application for Employer Identification Number (EIN) (Puerto Rico Version) 2016
Instruction SS-4 (PR) Instrucciones para la Forma SS-4PR, Solicitud de Numero de Identificacion Patronal (EIN) 2011
Instruction SS-4 (sp) Instructions for Form SS-4 (PR), Application for Employer Identification Number (Spanish Version) 2023
Form SS-8 Determination of Worker Status for Purposes of Federal Employment Taxes and Income Tax Withholding 2023
Form SS-8 Determination of Worker Status for Purposes of Federal Employment Taxes and Income Tax Withholding 2014
Form SS-8 Determination of Worker Status for Purposes of Federal Employment Taxes and Income Tax Withholding 2011
Form SS-8 Determination of Worker Status for Purposes of Federal Employment Taxes and Income Tax Withholding 2009
Form SS-8 Determination of Worker Status for Purposes of Federal Employment Taxes and Income Tax Withholding 2006
Form SS-8 Determination of Worker Status for Purposes of Federal Employment Taxes and Income Tax Withholding 2003
Form SS-8 Determination of Worker Status for Purposes of Federal Employment Taxes and Income Tax Withholding 2001
Form SS-8 Determination of Worker Status for Purposes of Federal Employment Taxes and Income Tax Withholding 1997

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