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A form W-9 is a “Request for Taxpayer Identification Number.” When a business pays $600 or more in a calendar year to another business or individual who is not an employee, the business is required to file an information tax return with the IRS. To do so, the business must obtain the correct taxpayer identification number to include on the return.

Examples of businesses that require a W-9 include those that issue 1099s to independent contractors and those that must report real estate transactions, contributions to an IRA, cancellation of debt, payments to a childcare provider and other monetary transactions. See IRS form W-9 information and instructions.

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