All businesses should verify social security numbers (SSNs) of all employees and subcontractors. The IRS and the Social Security Administration have made it easy to do this via the internet. You can verify up to 10 names and SSNs (per screen) online and receive immediate results. This option is ideal to verify the SSNs of current or former employees and contractors, and prior to issuing W-2s and 1099s. Do not use the service to verify SSNs of potential new hires or contractors. Social Security will advise you when a submitted name and SSN does not match their records.
You must register to use the Social Security Number Verification Service through Business Services Online. To use the option and for additional information, visit this link.

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Thanks for passing this information along.