S-Corp vs C-Corp: When It Might Be Time to Switch

Most small businesses start as LLCs or S-corporations because they want pass-through taxation — income flows to the owner's personal return without a separate corporate tax layer. For most businesses in most phases, this is the right structure. But there are circumstances — primarily related to exit planning and investment — where conversion to C-corporation status makes significant economic sense. The OBBBA has made this conversation more urgent for a specific category of business owner.

The Core Issue: Tax on Sale

When you sell a business structured as an S-corp or LLC, the gain is typically taxed as capital gain on your individual return. Long-term capital gains rates for higher-income sellers run 20% plus the 3.8% net investment income tax — a combined 23.8% federal rate before state taxes. On a $5 million gain, that's roughly $1.2 million in federal tax.

Under Section 1202 (Qualified Small Business Stock), gains from selling C-corporation stock can be excluded from federal income tax entirely — if the stock meets specific requirements. The exclusion is up to 100% of gains, up to the greater of $10 million or 10x the taxpayer's adjusted basis.

The potential tax savings on business sale are why this conversation has increased urgency after the OBBBA enhanced the QSBS provisions.

What QSBS Requires

For stock to qualify under Section 1202:

C-corporation requirement. Only C-corporation stock qualifies. S-corps, LLCs, and partnerships are categorically excluded.

Qualified small business. The corporation's aggregate gross assets must not have exceeded $50 million (or the OBBBA-adjusted threshold) at any time before or immediately after the stock was issued. This is a qualification at issuance — a company that later grows beyond the threshold doesn't lose QSBS status for stock already issued.

Active business. The corporation must be an active business in a qualifying trade or business — not primarily real estate, finance, hospitality, or professional services (specifically, health, law, engineering, architecture, accounting, actuarial science, performing arts, consulting, athletics, financial services, brokerage, and any business where the principal asset is the reputation or skill of employees are excluded). Technology, manufacturing, retail, and many other business types qualify.

Original issuance. The stock must be acquired at original issuance, not purchased from a secondary seller. This is why conversion timing matters — you acquire your stock in the converted C-corp at the time of conversion.

Five-year holding period. The stock must be held for more than five years before sale to qualify for full exclusion.

The Trade-Off: Current-Year Tax

The reason most businesses operate as S-corps or LLCs is that C-corporations are subject to corporate income tax at the entity level before distributing profits. The current federal corporate tax rate is 21%. For a profitable business that distributes significant earnings to owners annually, a C-corp creates double taxation — the business pays corporate tax, and the owner pays dividend or qualified dividend tax on distributions.

S-corps and LLCs avoid this: income flows through to the owner and is taxed once on the personal return.

The QSBS conversion makes sense primarily when:

• You plan to hold the company for 5+ years before sale
• The potential sale price (and therefore the tax savings on exit) is large enough to justify the potential double-taxation drag during the holding period
• The company isn't distributing most of its profits currently — retained earnings in a C-corp accumulate at 21% corporate rate, which can be a better effective tax rate than pass-through taxation for higher-bracket owners
• The business qualifies — not in an excluded service category

It doesn't make sense when:

• You expect to sell within 5 years (can't satisfy holding period)
• The business regularly distributes most profits (double taxation becomes real and significant)
• You're in an excluded service business (law, health, consulting, finance)
• The expected sale price is modest — the QSBS savings need to justify the conversion costs and ongoing C-corp compliance

The Conversion Process

An S-corp terminating its S-election and becoming a C-corp is mechanically straightforward: file the revocation of the S-corp election with the IRS, the effective date, and update your state filings. Your CPA handles this.

Converting from an LLC to a C-corp is more involved: the LLC checks the box to be taxed as a corporation, files Form 8832, and begins operating as a C-corp for federal tax purposes. Or the entity can convert to an actual corporation under state law.

The critical point: the five-year QSBS holding period begins at conversion. If you convert in 2026, the earliest you can fully qualify for QSBS exclusion on a sale is 2031. This is a long-term play, not a near-term tax strategy.

The Professional Conversation You Need to Have

This is not a DIY decision. The QSBS analysis requires your attorney and CPA to:

• Confirm your business type qualifies (not in an excluded category)
• Confirm expected asset thresholds at time of conversion
• Model the current-year tax cost of operating as a C-corp versus pass-through
• Model the exit tax savings and determine when the break-even point is
• Advise on state tax implications (some states don't conform to Section 1202 — California famously taxes QSBS gains)

If you're planning to hold for 5+ years and have a business that would generate a significant capital gain at sale, this conversation has a good chance of being one of the most valuable tax planning discussions you have. If you're selling in 18 months, it isn't.

This article is educational and does not constitute legal or tax advice. Entity structure decisions involve complex tax and legal considerations. Engage qualified legal and tax counsel for guidance specific to your situation.