US Internal Revenue Service Business and Specialty Tax Line Customer FAQ

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If you received Form CAP504B notifying you of unpaid tax debt and you dispute the claim, you have the right to challenge it. It's crucial to promptly respond. You should provide a written statement detailing your disagreement accompanied by supporting documentation. If the IRS made an error, include proof of payment or error correction. Disputing claims should be done very carefully because if you don't succeed, the IRS can proceed with collection efforts. Remember to make copies for your records of everything you send and note who you speak with regarding your dispute. We recommend consulting with a tax professional to assist with disputing your claim.

If you need to update the filing entity type, you will need to file the appropriate IRS form. For example, if you mistakenly filed as a sole proprietorship but are actually a corporation, you will need to file an amended tax return with the necessary form for corporations, such as Form 1120 for a C Corporation. If your business entity type changes for the upcoming fiscal year, e.g., from a sole proprietorship to LLC, you need to clearly indicate this change when filing your taxes for the upcoming fiscal year. Always consult with a tax professional for legal advice related to your specific situation.