Instructions for Form ST-556-X Amended Sales Tax Transaction Return - Illinois

This document contains official instructions for Form ST-556-X , Amended Sales Tax Transaction Return - a form released and collected by the Illinois Department of Revenue.

FAQ

Q: What is Form ST-556-X?
A: Form ST-556-X is the Amended Sales Tax Transaction Return for Illinois.

Q: When should I use Form ST-556-X?
A: You should use Form ST-556-X when you need to amend a previously filed Sales Tax Transaction Return in Illinois.

Q: How do I complete Form ST-556-X?
A: Follow the instructions provided on the form to complete Form ST-556-X accurately.

Q: What information do I need to include on Form ST-556-X?
A: You need to include the original information reported on the original return, as well as the corrected information on the amended return.

Q: Are there any deadlines for filing Form ST-556-X?
A: Yes, you must file Form ST-556-X within 3 years from the due date of the original return or within 2 years from the date you paid the tax, whichever is later.

Q: Can I file Form ST-556-X electronically?
A: No, Form ST-556-X can only be filed by mail.

Q: Do I need to attach any supporting documentation with Form ST-556-X?
A: Yes, you must attach a detailed explanation of the corrections made and any supporting documentation related to those corrections.

Q: What do I do with the completed Form ST-556-X?
A: Mail the completed Form ST-556-X and any required attachments to the address provided on the form.

Q: Can I request a refund using Form ST-556-X?
A: Yes, you can request a refund if you overpaid the sales tax on your original return. Include the amount you are claiming as a refund on Form ST-556-X.