ExpressExtension is an IRS-authorized e-file provider for all types of business entities, including C-Corps (Form 1120), S-Corps (Form 1120S), Multi-Member LLC, Partnerships (Form 1065). Trusts, and Estates.File Tax Extension Form 7004 InstructionsStep 1- Begin by creating your free account with ExpressExtensionStep 2- Enter the basic business details including: Business name, EIN, Address, and Primary Contact.Step 3- Select the business entity type and choose the form you would like to file an extension for.Step 4- Select the tax year and select the option if your organization is a Holding Co

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You do not sound as a person who handles intricasies of finances on daily basis, this is why you should redirect the qustion to your family’s tax professional who does hte filings for you.The form itself, W-9 form, is a form created and approved by the IRS, if that’s your only inquiry.Whether the form applies to you or to your husband’s estate - that’s something only a person familiar with the situation would tell you about; there is no generic answer to this.