Conversion and Election Timing
Treat the entity choice as an annual strategic review, not a permanent decision. A sole proprietor becomes an LLC, an LLC elects S-corp status, a successful S-corp converts to C-corp before a venture round — each transition has tax consequences, and the right time to make the transition is early, before the consequences scale. The conversions below describe the mechanics; the rule that ties them together is to convert on the upslope, never on the eve of a transaction that would amplify whatever tax the transition triggers.
Sole proprietor to LLC. Trivial. Forming a single-member LLC is a state filing; the IRS sees nothing change. A multi-member LLC formed from two or more sole proprietors is treated as a partnership formation under IRC §721, “Contributions to the partnership”, generally with no gain recognized on contribution unless liabilities transferred to the partnership exceed the contributor’s outside basis.
LLC to S-corporation (election only). An LLC that meets the S-corporation eligibility rules can elect S treatment on Form 2553 without changing its legal form. The IRS treats the LLC as a corporation that timely elected S status, and the LLC remains an LLC for state-law purposes. The election must be filed by the 15th day of the third month of the tax year in which it takes effect; a late election can sometimes be cured under Rev. Proc. 2013-30.
LLC to C-corporation (election or conversion). Two paths. The simpler is Form 8832 check-the-box, which leaves the legal form alone and elects association tax treatment. The other is a statutory conversion to a corporation under state law, generally tax-free under IRC §351 if the existing owners receive at least 80% of the new corporation’s stock in exchange for their LLC interests. The conversion route is standard when raising priced equity from institutional investors — venture funds will not buy LLC interests.
S-corp to C-corp. Revoke the S election by filing a statement of revocation with the IRS, retroactive to the start of the year if filed by the 15th day of the third month. The trap: once an S election is revoked, the corporation cannot re-elect S status for five years without IRS consent ( IRC §1362(g), “Election; revocation; termination”). Owners considering a revocation to take advantage of C-corp fringe benefits or to position for a QSBS-eligible financing should be certain — the five-year clock is not negotiable.
C-corp to S-corp. File Form 2553 for the new S election. The corporation is taxed as a pass-through prospectively, but appreciation that existed at the conversion date is subject to the IRC §1374, “Tax imposed on certain built-in gains” built-in-gains (BIG) tax: if the corporation sells appreciated assets within five years of the conversion, the gain that existed on the conversion date is taxed at the C-corporation rate, on top of the pass-through tax on any additional appreciation. Sequence the conversion to clear the five-year recognition window before any anticipated asset sale — which usually means converting at the earliest sign that the business has begun to appreciate, while the embedded gain is still small, instead of waiting until a buyer is at the table. Convert early and let the clock run while the business grows; do not convert in the year before sale.
QSBS clock implications. The IRC §1202 holding period starts on the date the C-corporation issues the stock. An LLC that converts to a C-corporation under IRC §351 starts the clock on the conversion date — not the date the LLC was originally formed. The same holds for any IRC §351 contribution that creates new C-corp stock. For a founder who has been operating as an LLC for years and is now contemplating a C-corp conversion, the five-year QSBS clock has not yet started and will not begin until the conversion is complete.
Changing states: redomestication, and why it usually buys nothing. A statutory conversion (also called redomestication or domestication) moves an entity’s state of formation without creating a new entity. Federally it is a mere change in identity or form — an F reorganization under IRC §368(a)(1)(F), “Definitions relating to corporate reorganizations”, blessed for exactly this fact pattern in Rev. Rul. 64-250. The corporation keeps its EIN, tax attributes carry over under IRC §381, “Carryovers in certain corporate acquisitions”, an S election survives, contracts and intellectual-property assignments are undisturbed because the legal person never changed, and the IRC §1202 holding period keeps running. Its ugly cousin — dissolving in the old state and incorporating fresh in the new one — does the opposite: a new entity, a new EIN, a restarted QSBS clock, and every contract, SAFE, and option grant needing re-execution. That path is malpractice for an operating company with a cap table, and it is what founders do to themselves when they follow a forum post.
The mechanism works. The reason to convert usually does not. Where an entity is formed does not determine where it owes tax. State income tax follows nexus and apportionment — where the people, property, sales, and payroll actually are. Convert a California LLC into a Nevada LLC while the founders and the engineers stay in Palo Alto and California still collects: the $800 minimum franchise tax, the LLC fee scaled to California-source receipts, an apportioned share of entity income, and the owners’ personal tax at California rates on their distributive share. You will have added a registered agent in Nevada and a foreign-qualification filing back in California for the privilege. The lever that actually works is moving the owner — see section “Domicile and the Conversion Year” — and moving the operations along with them. An entity conversion unaccompanied by a human relocation is theater, and the promotional literature urging it is written by people who bill for the filing.
What the state of formation genuinely buys is corporate law: fiduciary standards, the depth of the case law, appraisal rights, and what institutional investors will sign. That is why venture-backed companies incorporate in Delaware and why leaving can cost you a round. If the objection is the Delaware franchise tax, fix the arithmetic before you fix the domicile. Delaware bills you by default under the authorized shares method, which produces a five-figure invoice for a startup carrying ten million authorized shares and almost no assets. Recompute under the assumed par value capital method — gross assets divided by issued shares gives an assumed par value, multiplied by authorized shares gives assumed par value capital, then $400 per million — and the same company typically owes the $400 minimum plus the annual report fee. Finally, check your documents before filing anything: preferred-stock protective provisions and loan covenants routinely require investor or lender consent to change the state of incorporation, and converting without it constitutes a breach or default, not a tax saving.