LLC vs Sole Proprietorship: Tax Treatment Compared 2026

Understand when forming an LLC changes your taxes — and when it doesn't. Compare liability protection, filing requirements, and costs.

By Muhammad AkbarLast reviewed October 24, 2026How we calculate

The Default Tax Reality

A single-member LLC is taxed identically to a sole proprietorship by default. Both report business income on Schedule C and pay the same 15.3% self-employment tax. Forming an LLC changes your legal protection, not your tax bill — unless you elect a different tax status.

Liability Protection

A sole proprietorship offers no separation between you and your business — personal assets are exposed to lawsuits and business debts. An LLC creates a legal shield: creditors can generally only reach business assets. This is the primary reason to form an LLC.

Costs and Paperwork

Sole proprietorships require zero formation cost and minimal paperwork — just report income on Schedule C. LLCs require state filing fees ($50 to $500 depending on state), annual report fees, a registered agent, and an operating agreement. The cost of liability protection varies by state.

When an LLC Is Worth It

Form an LLC if you work in a liability-prone field (contracting, consulting, any client-facing service), have significant personal assets to protect, or want the credibility that comes with a registered business entity. Skip it if you're testing a low-risk side hustle.

Frequently Asked Questions

Does an LLC reduce self-employment tax?

No. A single-member LLC is a disregarded entity for tax purposes — you still pay 15.3% self-employment tax on net profit. Only an S-Corp election changes that, by paying SE tax on salary instead of distributions.

How much does forming an LLC cost?

State filing fees range from $50 (Arizona, Iowa) to $500 (Massachusetts). Annual fees range from $0 to $800 (California franchise tax). Registered agent services cost $50-300/year if you don't serve as your own agent.

Can I convert from sole proprietorship to LLC later?

Yes. You can form an LLC at any time and continue operating under it. Existing business assets, contracts, and client relationships can transfer to the LLC, though you should formally document the transfer.

Sources

IRS Revenue Procedure 2025-32 — 2026 inflation adjustments — tax brackets, standard deduction, QBI thresholds.
IRS Schedule SE instructions — Self-employment tax: the 92.35% adjustment, the Social Security wage base, the Medicare surtax.
IRS Form 1040-ES — Estimated tax deadlines and the safe-harbour rules used for the quarterly schedule.
IRS Publication 334 — Tax guide for small business — deductible expenses and net profit.
IRS Social Security wage base — The $184,500 Social Security cap applied for 2026.

How these numbers are produced

Calculations follow the order of operations on the IRS forms themselves: net profit, the 92.35% adjustment, self-employment tax, the 50% deduction against AGI, the standard deduction, the §199A QBI deduction with its phase-out, then the federal brackets. State tax is computed separately on state AGI less that state's own standard deduction, because no state allows the federal QBI deduction and almost none allow the federal standard deduction.

What it does not cover. The calculators model a single filer or a married couple filing jointly with self-employment income as the main source. They do not model local income taxes, W-2 wages held alongside freelance work, itemized deductions, the alternative minimum tax, or credits. Where a local income tax exists, it is described on that state's page.

Not advice. SelfTaxCalc produces estimates, not tax advice. No one here is a CPA, an enrolled agent or a tax attorney, and nothing on this site creates a professional relationship. Estimates are a starting point for planning and for a conversation with a professional — they are not a substitute for one.