Starting a Business: LLC, S Corporation and Other Tax Choices

Choose a business’s legal structure and its tax treatment as two related decisions. An LLC is created under state law. S-corporation status is a federal tax election available to an eligible corporation or entity. An LLC can therefore be taxed as a sole proprietorship, partnership, C corporation or S corporation, depending on ownership and elections. IRS LLC classification

For a solo owner, compare sole-proprietor taxation with an LLC’s state-law protection and annual costs first. Evaluate S treatment when a supported salary leaves enough profit for potential payroll-tax savings to exceed the added costs. Consider a C corporation when ownership or financing needs favor it.

Distinguish the legal entity from its federal return

Common arrangement	Usual federal reporting	Main decision to investigate
Individual sole proprietor	Schedule C for an ordinary operating business	Personal exposure and business registration requirements
Domestic single-member LLC, default treatment	Usually disregarded; individual owner’s ordinary business generally on Schedule C	State liability framework and annual costs
Domestic multi-member LLC, default treatment	Partnership return, Form 1065, and owner K-1s	Ownership agreement, allocations and partner tax treatment
Eligible entity electing S status	Form 1120-S and shareholder K-1s; payroll for owner-employees	Eligibility, compensation and total compliance cost
C corporation	Form 1120; separate shareholder tax treatment	Investor requirements, retained earnings and exit plan

These are ordinary cases; rental, farm and other activities can use different forms. IRS classification and S-election guidance explain the federal distinctions. LLC classifications and S corporations

List the licenses, business-name registration, insurance, and tax accounts required by the state and city where the work occurs. Price those obligations alongside any entity formation and annual reporting fees before choosing a structure.

Evaluate liability separately from tax savings

Review an LLC’s liability protection together with its exceptions. California Corporations Code Section 17703.04, for example, preserves potential personal liability for a member’s own tortious conduct and written guarantees. Have counsel assess lease or loan guarantees separately from the entity’s ordinary business debts. California statute.

Have counsel identify risks from client errors, products, premises, employees, and borrowing. Coordinate the entity with contracts and insurance, reviewing personal guarantees and professional-liability exposures separately. Keep signed agreements and coverage documents in the business records.

For multiple owners, write down ownership percentages, contributions, decision rights, compensation, departures and dispute procedures before money arrives. Two people with equal ownership can still disagree about who works more hours or how much cash must remain in the business.

Test S-corporation eligibility and the election date

S corporations generally must be domestic, have no more than 100 shareholders, have only one class of stock and have eligible owners. Partnerships, corporations and nonresident alien shareholders generally are not eligible owners, while some trusts and estates qualify. These restrictions can matter more than the initial tax calculation. IRS S-corporation requirements

Form 2553 generally must be filed no more than 2 months and 15 days after the start of the tax year for which the election will apply, or during the preceding tax year. New entities require attention to when their first tax year begins. Late-election relief has conditions; it is not automatic. Retain shareholder consents, proof of filing and the IRS acceptance notice. Form 2553 instructions

An eligible LLC can often elect S treatment without creating a new state-law entity, but that does not eliminate payroll setup, accounting changes or a review of the operating agreement. Check whether existing ownership or economic rights conflict with S requirements before filing.

Compare payroll savings with all additional costs

An owner who provides services to an S corporation generally needs reasonable wages before nonwage distributions. Salary is subject to employment taxes; qualifying nonwage distributions are not wages. Reasonable compensation depends on the work and comparable pay, not a fixed percentage of profit. IRS compensation guidance

Use a written comparison with these rows:

• Business profit before owner salary and employer payroll taxes.
• Supported owner salary and both sides of payroll tax.
• Payroll service, additional returns and bookkeeping.
• State entity taxes and local fees.
• Retirement contributions and owner health-insurance treatment.
• Federal and state owner income tax, including any QBI effect.

In a hypothetical proposal, $7,000 of payroll-tax savings minus $2,400 additional administration and $1,200 additional state tax leaves $3,400 before income-tax interactions. Test a lower-profit year as well, since payroll service and return-preparation costs can continue when profit falls.

Pass-through income can be taxable to an owner even when cash stays in the business. Agree on tax distributions and cash reserves rather than treating the bank balance as freely spendable. The self-employment tax guide supplies a detailed payroll comparison and current contribution figures.

Understand the C-corporation tradeoff

A C corporation generally pays federal income tax at 21%. Distributing after-tax earnings as dividends can create a second shareholder-level tax. The corporate rate alone therefore does not measure the owner’s combined burden. IRS Publication 542

With $100,000 corporate taxable profit, 21% federal corporate tax leaves $79,000. If all of it is distributed and an assumed 15% shareholder dividend rate applies, dividend tax is $11,850 and combined federal tax $32,850, before other adjustments. Repeat the comparison with the owner’s actual dividend rate, state taxes, and any net investment income tax.

Confirm prospective investors’ ownership and preferred-stock requirements before choosing an entity. Those needs may favor a C corporation even when pass-through taxation looks cheaper initially. Model retained earnings, dividends, and the expected exit with the business’s financing plan.

Check current qualified-small-business-stock rules

Section 1202 can exclude eligible gain from qualifying C-corporation stock, but forming a corporation does not by itself create qualifying stock. Original issuance, active-business requirements, excluded industries and asset tests matter.

For stock acquired after July 4, 2025, the exclusion percentage can be 50% after at least 3 years, 75% after at least 4 years and 100% after at least 5 years. The applicable per-issuer dollar limit starts at $15 million for this stock, with coordination for prior gains and an alternative ten-times-basis limit. The qualifying issuer gross-asset threshold increased to $75 million for stock issued after that date. Older stock follows different rules. Current Section 1202

For potential Section 1202 treatment, have counsel document the stock’s original issuance, acquisition date, capitalization, active business, and asset-test eligibility. Retain those records throughout ownership, then review them before a sale.

Include state charges and current startup deductions

California illustrates why a federal comparison is incomplete. An ordinary LLC doing business or organized there generally owes an $800 annual tax, subject to exceptions, and an additional fee starts at $900 for $250,000–$499,999 of the relevant California total income. That fee base is not simply net profit. The general first-year LLC exemption applied to tax years beginning in 2021–2023, not every new LLC in 2026. California LLC rules

California S corporations generally face a 1.5% tax on California-source net income and an $800 minimum franchise tax, with first-year and other exceptions. The minimum-tax waiver for a qualifying first year does not waive the 1.5% tax on net income. California S-corporation rules

Federal startup and organizational costs can each qualify for an initial deduction of up to $5,000, reduced when the relevant category exceeds $50,000; remaining qualifying costs generally are amortized over 180 months. These are separate from equipment purchases. IRS starting-business guidance and Form 4562 instructions

For 2026, the Section 179 limit is $2,560,000, with dollar-for-dollar phaseout above $4,090,000 of qualifying property placed in service. Income and property restrictions apply. Eligible property acquired and placed in service after January 19, 2025 can qualify for 100% bonus depreciation under the revised rules. Compare these deductions with the property’s eligibility, business use, and income forecast. IRS depreciation guidance.

Set up an operating calendar before launch

Obtain required registrations, an EIN where needed, a business bank account, accounting records and payroll arrangements. An EIN is available without an IRS application fee. Keep entity formation, tax elections and local licenses as separate checklist items. IRS Publication 583

For federal individual estimated-tax planning, timely payments generally target the smaller of 90% of current-year tax or 100% of prior-year tax, with the prior-year percentage increasing to 110% above the relevant AGI threshold: $150,000, or $75,000 for married filing separately. The prior-year return must cover twelve months, and installment timing and exceptions matter. This avoids certain underpayment penalties, not the final balance due. IRS Publication 505

FinCEN’s August 2026 final rule, effective August 14, preserves the BOI reporting exemption for U.S.-created companies. Certain foreign-formed entities registered to do business in the United States remain within the reporting framework. Keep state registrations and tax filings on the operating calendar separately. FinCEN’s current BOI guidance.

Sources

Checked November 3, 2026: IRS entity classification, S-corporation rules, depreciation guidance, FinCEN BOI guidance, and the state and federal authorities linked above. Use the ownership, compensation, state costs, and financing requirements of the actual business in the comparison.