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What Is a W-9 Tax Form? | H&R Block

For additional W-9 tax form details, you can review the Form W-9 Instructions, which are included with the IRS W-9 form on its website. W-9 Tax Form Questions. Have additional questions about IRS Form W-9 or need help filing your return? Our Tax Pros speak the tricky language of taxes and are committed to helping you better understand your return.