LLC vs S-Corp vs C-Corp in Kentucky: How to Choose Your Business Structure

For most Kentucky founders the choice comes down to one question: are you building a profitable business that pays its owners, or a company that will sell equity to investors? If it's the first, start with a Kentucky LLC and add the S-corp tax election once profits justify it. If it's the second, form a Delaware C-corporation from day one and register it to do business in Kentucky.

The rest of this guide covers what each structure costs in Kentucky, how the IRS, Frankfort, and Louisville Metro tax it, where the S-corp math turns positive, and how to switch later. If you haven't registered anything yet, start with our guide to starting a business in Kentucky.

This is general information, not tax advice. Your numbers depend on your full return, so run the final decision past a CPA who works with Kentucky small businesses.

What Is the Difference Between an LLC, an S-Corp, and a C-Corp?

• LLC (limited liability company) is a legal entity you create under Kentucky law. By default the IRS ignores it for income tax: a single-member LLC is taxed like a sole proprietorship, and a multi-member LLC is taxed as a partnership.
• C-corporation is a corporation taxed under the regular corporate rules. Every corporation is a C-corp unless it elects otherwise.
• S-corporation is a federal tax election. A corporation or an LLC files Form 2553 with the IRS, and from then on its profits pass through to the owners' personal returns, with the owners who work in the business paid through payroll.

So "LLC vs S-corp" really means "should my LLC keep its default taxation or elect S-corp taxation?" An LLC taxed as an S-corp is the most common setup for profitable owner-operated businesses in Louisville.

How Do You Form Each Structure in Kentucky?

All three start with a filing at the Kentucky Secretary of State, usually through the Kentucky One Stop Business Portal. Every Kentucky entity needs a registered agent with a Kentucky address.

LLC. File Articles of Organization. The fee is $40. Write an operating agreement even if you're the only member.

Corporation. File Articles of Incorporation. The fee is $40 plus Kentucky's organization tax, which is based on authorized shares: one cent per share for the first 20,000 shares, half a cent per share for the next 180,000, and two-tenths of a cent per share above that, with a $10 minimum. Authorizing 1,000 shares costs the $10 minimum; authorizing the millions of shares a startup cap table needs gets expensive fast.

S-corp election. After forming the LLC or corporation, file IRS Form 2553. To have it apply for the current year, file no more than two months and 15 days after the start of that tax year. An LLC that files Form 2553 doesn't need to file Form 8832 separately. Kentucky follows the federal S election, so there's no separate state election to make.

Ongoing. Every Kentucky LLC and corporation files a $15 annual report with the Secretary of State between January 1 and June 30 each year. You'll also need an EIN (free from the IRS) and, in Louisville, a registration with the Louisville Metro Revenue Commission. Our Louisville business license and permits guide covers the local registrations.

How Is Each Structure Taxed Federally?

Default LLC (sole proprietorship or partnership). Profit flows to your personal return on Schedule C or a K-1. You pay income tax at your ordinary rates, and you pay self-employment tax on your share of net earnings: 15.3% (12.4% Social Security plus 2.9% Medicare) on 92.35% of net earnings, with the Social Security part stopping at the 2026 wage base of $184,500. You deduct half of the self-employment tax. Pass-through owners may also qualify for the Section 199A qualified business income deduction, which the 2025 federal tax law made permanent at 20%.

S-corp. The company pays no federal income tax. Owners who work in the business must take a reasonable salary through payroll, which is subject to FICA (7.65% withheld from you, 7.65% paid by the company). Profit left after salary passes through on a K-1 and is subject to income tax but not to Social Security or Medicare tax. That gap is the entire reason people elect S-corp status.

C-corp. The corporation pays a flat 21% federal income tax on its profit. When it pays dividends, shareholders pay tax again on those dividends, generally at qualified dividend rates of 0%, 15%, or 20%, plus the 3.8% net investment income tax for higher earners. Double taxation matters less for startups that reinvest everything and never pay dividends, which describes most venture-backed companies.

How Does Kentucky Tax LLCs, S-Corps, and C-Corps?

Kentucky layers two state taxes on top of the federal treatment.

Income tax. Kentucky's individual income tax is a flat 3.5% for 2026, down from 4% in 2025. LLC and S-corp profits that pass through to you are taxed at that rate on your Kentucky return. The state budget triggers for a further cut were not met this year, so don't plan around a lower rate yet. C-corps pay Kentucky's flat 5% corporate income tax on their own profit, and dividends you receive are then taxed at the individual rate.

Pass-through entities can also elect Kentucky's pass-through entity tax (PTET), which pays the owners' Kentucky income tax at the entity level, mainly to work around the federal cap on state and local tax deductions. Ask your CPA whether it helps you.

Limited Liability Entity Tax (LLET). Kentucky charges the LLET to entities that give their owners liability protection: LLCs, S-corps, C-corps, and limited partnerships. Sole proprietorships and general partnerships don't pay it. If your Kentucky gross receipts or gross profits are $3 million or less, you pay the $175 minimum. Between $3 million and $6 million a sliding scale applies, and above that the tax is the lesser of 0.095% of Kentucky gross receipts or 0.75% of Kentucky gross profits.

The LLET above $175 isn't purely additive. Pass-through owners get a nonrefundable credit for the entity's LLET (less the $175 minimum) against the Kentucky income tax on that business income, and C-corps can credit it against their corporate income tax the same way. For a small business, the practical cost is $175 a year.

Single-member LLCs owned by an individual report the LLET on Form 725. S-corps and multi-member LLCs file Form PTE, and C-corps file Form 720.

How Does Louisville's Occupational License Tax Treat Each Structure?

If you operate in Jefferson County, the Louisville Metro Revenue Commission collects an occupational license tax on two things: wages earned in Louisville Metro, and business net profits. For 2026 the rate on business net profits is 2.2% (1.25% Louisville Metro, 0.75% school boards, 0.20% TARC). Residents pay 2.2% on wages, and nonresidents pay 1.45% because they're exempt from the school board portion.

The tax is assessed on the entity, not passed through to the owners. Every LLC, S-corp, partnership, and C-corp doing business in Louisville files Form OL-3 and pays on its net profit. For an S-corp, the starting point is ordinary business income from Form 1120-S, which is figured after your salary has been deducted. Your salary is then taxed separately as wages, withheld through payroll.

That's why the S-corp election doesn't save much Louisville tax. With a default LLC, you pay 2.2% on the whole profit. With an S-corp, you pay 2.2% on your salary plus 2.2% on what's left. The total is about the same, slightly lower only because the employer share of payroll taxes is a deductible expense. Distributions aren't taxed again because that profit was already taxed at the entity level.

Two other local wrinkles: owners' health insurance premiums and retirement plan contributions aren't deductible when computing net profit for this tax, and if your annual tax on net profits exceeds $5,000 you must make quarterly estimated payments.

Comparison Table: LLC vs S-Corp vs C-Corp in Kentucky

How Do You Set a Reasonable Salary?

The IRS requires S-corp owners who work in the business to pay themselves reasonable compensation before taking distributions. There's no published percentage. "Reasonable" means what you'd have to pay someone else to do the work you do, judged by your role, hours, experience, and what comparable businesses pay.

Paying yourself $20,000 and taking the rest as distributions is a well-known audit target. If the IRS recharacterizes distributions as wages, you owe the back payroll taxes plus penalties and interest. Keep a defensible salary backed by local wage data.

When Does the S-Corp Election Start to Pay Off?

The election saves Social Security and Medicare tax on profit above your salary. It costs you payroll processing, a separate business tax return, state unemployment insurance on your own wages, and more bookkeeping discipline. The question is where the savings clear the costs.

Illustrative example. These are made-up numbers for a single-owner Louisville business, chosen to show the mechanics. Your results will differ.

Assume a Louisville resident's LLC earns $120,000 in net profit before paying the owner, and a reasonable salary for the work is $60,000.

As a default single-member LLC:

• Self-employment tax: $120,000 × 92.35% × 15.3% = $16,955
• Louisville occupational tax: $120,000 × 2.2% = $2,640

With the S-corp election:

• FICA on the $60,000 salary, both halves: $60,000 × 15.3% = $9,180
• Remaining profit after salary and the employer's $4,590 FICA share: about $55,410, passed through with no Social Security or Medicare tax
• Louisville occupational tax: ($60,000 + $55,410) × 2.2% = about $2,539

Payroll tax savings come to about $7,775, and the Louisville tax drops by about $100. Against that, budget for a payroll service and a more expensive tax return. If those run $2,000 to $3,000 a year combined (again an illustrative assumption; get real quotes), the owner nets roughly $5,000 a year.

Now run the same math at $50,000 of profit with a $35,000 salary. Self-employment tax as an LLC would be about $7,065. FICA on the salary would be $5,355. Savings: about $1,700, which the extra costs can easily consume.

Two second-order effects shrink the savings further: salary reduces the profit eligible for the 20% qualified business income deduction, and lower Social Security wages mean a slightly smaller benefit later. Neither usually flips the answer at $120,000, but both matter near breakeven. Elect when profit is steady and well above a reasonable salary, and after a CPA has run your actual numbers.

Why Do Venture-Backed Startups Use a Delaware C-Corp?

If you plan to raise from venture funds, investors expect a Delaware C-corporation, for three reasons.

1. Preferred stock. VC rounds sell preferred stock with liquidation preferences. S-corps can have only one class of stock, and LLC units don't fit standard venture documents.
2. Investor eligibility. Venture funds are partnerships, often with tax-exempt or foreign limited partners who don't want pass-through income. S-corps can't have partnership or corporate shareholders at all.
3. Predictable law. Every startup lawyer, investor, and acquirer already knows Delaware corporate law, which makes deals faster and cheaper.

A Delaware corporation that operates in Louisville must register in Kentucky as a foreign corporation by filing an Application for Certificate of Authority with the Kentucky Secretary of State. The fee is $90. You'll need a Kentucky registered agent, and you'll file the $15 Kentucky annual report each year in addition to Delaware's annual report and franchise tax, both due March 1. File the Delaware franchise tax using the assumed par value capital method; the default authorized shares method can produce a startling bill for a startup with millions of authorized shares.

Kentucky then taxes the corporation like any other C-corp doing business here: 5% corporate income tax on Kentucky-apportioned profit, the LLET, and Louisville's occupational license tax if you operate in Jefferson County. For how Louisville founders actually raise, see our guide to Louisville venture capital and angel investors, and for capital that doesn't require selling equity at all, our Kentucky small business grants and funding guide.

Why Does QSBS Matter for C-Corp Founders?

Section 1202 lets founders and investors exclude gain on qualified small business stock (QSBS) from federal income tax. For stock issued after July 4, 2025, the exclusion is 50% after three years, 75% after four years, and 100% after five years. The cap is the greater of $15 million (indexed for inflation after 2026) or 10 times your basis, and the company's gross assets can't exceed $75 million when the stock is issued.

The catch: QSBS has to be stock acquired at original issuance from a C-corporation that runs a qualifying active business. LLC units don't qualify. S-corp stock doesn't qualify, even if the company later revokes its S election. If there's any real chance you'll sell the company for a large gain, the clock only starts once you hold C-corp stock, so converting early can be worth a lot. Some service businesses, including health, law, consulting, and financial services, are excluded. Talk to a tax attorney before relying on QSBS.

How Do You Switch Structures Later?

You aren't locked in. The common moves:

• LLC to S-corp taxation. File Form 2553. No new entity, no new Kentucky filing. If you miss the two-month-and-15-day window, the IRS offers late-election relief in many cases, but don't count on it.
• S-corp back to default LLC taxation. Revoke the election. Generally you can't re-elect S status for five years, so treat this as a one-way door.
• LLC to C-corp before a raise. Either convert the LLC into a corporation under state law, or form a new Delaware corporation and contribute the LLC's assets or membership interests to it. Your startup lawyer will pick the route based on the cap table, tax position, and investor requirements. Converting usually happens right before a priced round, and the QSBS holding period starts at conversion. Gain built up while you were an LLC isn't eligible for the exclusion.
• S-corp to C-corp. Revoke the S election. Plan the timing, since it affects how the year's income is split and when newly issued shares can start qualifying as QSBS.

The expensive mistakes come from switching late, such as restructuring an LLC in the middle of a term sheet negotiation, or losing an S election by admitting an ineligible shareholder.

Frequently Asked Questions

How do I create an S-corp in Kentucky?

Form an LLC ($40) or a corporation ($40 plus a $10 minimum organization tax) with the Kentucky Secretary of State, get an EIN, then file IRS Form 2553 within two months and 15 days of the start of the tax year the election should cover. Kentucky follows the federal election, so there is no separate state election, but the business files Kentucky Form PTE and pays the $175 minimum LLET.

How do I create a C-corp in Kentucky?

File Articles of Incorporation with the Kentucky Secretary of State for $40 plus an organization tax based on authorized shares, with a $10 minimum. If you plan to raise venture capital, incorporate in Delaware instead and register in Kentucky with a $90 Application for Certificate of Authority.

Is an LLC or S-corp better for a small business in Kentucky?

Start as an LLC and elect S-corp taxation once profit is steady and well above a reasonable salary for your role, since the savings come only from avoiding Social Security and Medicare tax on profit above that salary. At lower profit levels, payroll and extra tax-return costs can wipe out the savings.

What is the Kentucky LLET minimum?

The Limited Liability Entity Tax minimum is $175 a year for LLCs, S-corps, C-corps, and limited partnerships with $3 million or less in Kentucky gross receipts or gross profits. Larger businesses pay more under a sliding scale or a percentage of receipts or profits. Sole proprietorships and general partnerships don't pay it.

Does an S-corp reduce Louisville occupational license tax?

Not meaningfully. Louisville Metro taxes residents' wages and business net profits at 2.2%, so an S-corp owner pays on salary through payroll and the entity pays on remaining net profit, which totals about the same as a default LLC paying 2.2% on all its profit. The S-corp savings come from federal payroll taxes.

What tax rate do Kentucky corporations pay?

Kentucky C-corporations pay a flat 5% corporate income tax on Kentucky-apportioned profit plus the LLET, which is $175 for most small companies. Federally they pay a flat 21%, and in Louisville the corporation also pays the 2.2% occupational license tax on net profits.

Can I switch from an LLC to a C-corp later?

Yes. Most founders convert right before a priced venture round, through a statutory conversion or by moving the LLC into a new Delaware corporation. It's routine but costs legal fees, and the QSBS holding period starts only once you hold C-corp stock, so founders who know they'll raise often start as a Delaware C-corp.