Acquiring an Existing LLC: Tax Classification and Hidden Liability Risk

Buying an LLC's membership interest means inheriting its tax classification, EIN, and all liabilities. Before closing, verify how the LLC is taxed (disregarded entity, partnership, S-corp, or C-corp) and conduct due diligence on unpaid taxes and unresolved audits.

Check the LLC's tax classification first. An LLC can be taxed as a disregarded entity (single member), a partnership (multi-member default), or an S-corp or C-corp (by election). The existing classification determines how the purchase is treated. Buying a disregarded entity's membership interest is treated as an asset purchase for tax purposes. Buying into a partnership-taxed LLC is a partnership interest purchase with different rules entirely.

You inherit the EIN and tax elections. The entity's employer identification number, accounting method elections, and depreciation schedules carry forward. If the LLC previously made an S-corp election, that election continues unless you affirmatively revoke it.

Existing liabilities transfer with the entity. Unlike an asset purchase, acquiring an LLC's membership interest means you step into the entity's shoes -- including any unpaid taxes, pending audits, or undisclosed obligations. Tax due diligence on the entity's filing history is essential.

The pitfall: Assuming the LLC's current tax classification is optimal for your situation. A CPA should evaluate whether the existing classification serves your goals or whether a new election is needed -- and what the cost of changing it would be.