About Form CT-1-X, Adjusted Employer's Annual Railroad Retirement Tax Return or Claim for Refund

Use this form to correct errors on a Form CT-1 that you previously filed:

• Tier I Employee tax, Tier I Employee Medicare tax, and Tier II Employee tax;
• Tier I Employer tax, Tier I Employer Medicare tax, and Tier II Employer tax;
• Exemption for qualified employer's share of Tier I tax on compensation paid to qualified employees; and
• Credit for qualified employer's share of Tier I tax on compensation paid to qualified employees.

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