The answer above applies to social security and RRTA Tier 1 taxes. For any RRTA Tier 2 tax excesses from multiple employers or a single employer that doesn't adjust overcollections, you will need to complete Form 843 and mail it separately to the service center where you would be required to a file a current-year tax return. See instructions, page 3.
Topic No. 608 Excess Social Security and RRTA Tax Withheld
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