Adding a Partner or Member to Your Wyoming LLC (Amendment Guide 2026)

# Adding a Partner or Member to Your Wyoming LLC (Amendment Guide 2026) Bringing in a co-founder, an investor, or converting a solo LLC into a multi-member partnership changes almost every legal and tax layer of your Wyoming LLC. Here is what actually has to happen — and what does not, despite what other guides suggest. ## What legally changes when you add a member 1. **Federal tax classification flips** — a single-member LLC (disregarded entity) becomes a multi-member LLC (default partnership taxation, Form 1065). Form 5472 obligation ends; Form 1065 begins. 2. **EIN stays the same** — you do not need a new EIN when adding a member. 3. **Operating Agreement must be updated** — the current version becomes obsolete the moment the new member joins. Percentage interests, voting rights, capital contributions and distribution waterfall all need explicit language. 4. **FinCEN BOI updates required within 30 days** — every beneficial owner (25%+ ownership or substantial control) must be filed. Miss the deadline: $591/day civil penalty. 5. **Bank signatories update** — Mercury requires re-KYC on new members holding 25%+ before adding them as authorized signatories. 6. **Wyoming annual report next filing** — no immediate re-filing, but the next Wyoming annual report reflects the updated membership list (Wyoming doesn't publish this, but internal records must match). ## What does not change - The LLC's legal name and Certificate of Formation. - The EIN. - The Wyoming state filing fee — no re-formation required, only amendment of internal governance. - Wyoming's charging-order asset-protection statute applies equally to multi-member LLCs (arguably stronger, since single-member charging-order protection in some other states has been challenged). ## Step-by-step process **Step 1: Draft the Membership Interest Purchase Agreement (MIPA) or Admission Agreement.** Specify capital contribution ($, IP, sweat equity), percentage acquired, vesting schedule if any, and vested/unvested status. **Step 2: Amend the Operating Agreement.** Rewrite Article II (Members and Interests), Article IV (Capital Contributions), Article V (Distributions), Article VII (Management and Voting) at minimum. Have all members sign and date. Store originals with your Registered Agent or in a secure vault. **Step 3: File FinCEN BOI update within 30 days.** Log into the FinCEN BOI portal, add new beneficial owner, upload passport image, submit. Confirmation email is your proof of filing. **Step 4: File IRS Form 8832 if you want to change classification proactively.** Default is automatic conversion to partnership on the effective date. Optional election to be taxed as an S-corp or C-corp requires Form 2553 or Form 8832. **Step 5: Update Mercury (or Relay) with the new member.** Upload the amended Operating Agreement, complete KYC on the new member, add as authorized user if applicable. **Step 6: Plan for Form 1065 partnership return.** Due March 15 following the tax year in which the member was added. Requires K-1 to each member. A US CPA is not optional at this stage. ## Tax consequences worth understanding before you commit - **Loss of disregarded status** — you now file Form 1065 with K-1s to each member. Simpler than a C-corp; more complex than a solo disregarded entity. - **Foreign partner ECI implications** — if any partner is a non-US person and the LLC has US-source income, ECI withholding (Section 1446) applies at 37% on distributive shares of ECI. Real money. - **Capital account tracking** — Form 1065 requires per-member capital account maintenance from day one. Your bookkeeper needs to know. - **State-level foreign qualification review** — some states re-examine LLC filings when membership changes. Rarely blocks anything but adds paperwork if you operate in multiple states. ## Timing tip Add members effective on the first day of a US tax year (January 1) whenever possible. Mid-year admissions require short-period returns for both the pre-admission and post-admission portions — messy, more CPA hours, more risk of errors. ## Common mistakes - Verbal agreement, no MIPA — creates a partnership under Wyoming statute but with zero written terms, which is a lawsuit waiting to happen. - Skipping FinCEN BOI update — $591/day civil penalty starts on day 31. - Forgetting Form 1065 the following March 15 — $220/month per partner late-filing penalty. - Not amending Mercury signatory records — deposits reconcile, but any dispute or fraud claim gets stuck at KYC. ## Our approach If you're adding a co-founder or investor, we handle the Wyoming amendment paperwork, draft the updated Operating Agreement, coordinate FinCEN BOI update, and hand the completed package to your US CPA for the tax filings. [Book a free call](/contact) to discuss your specific structure.