Human Resources and Security Specialists should use this tool to determine the correct investigation level for any covered position within the U.S. Federal Government.
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OPM provides a federal tax calculator on our website, www.opm.gov/retire, that may assist you in determining the amount of Federal income tax to withhold. Please be advised that changing the amount of your Federal income tax withholding will not reduce your tax liability at the end of the tax year.
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