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Not legal or tax advice
This guide explains how the two structures differ and the general income thresholds where each makes sense. Your actual decision depends on your state, profession, risk tolerance, and existing financial picture. Work with a CPA and/or attorney for your specific entity decision.
The most important thing to understand first

A single-member LLC does not automatically save you taxes. The IRS taxes a single-member LLC identically to a sole proprietorship by default — both report income on Schedule C and pay the full 15.3% SE tax. The LLC gives you liability protection and credibility. Tax savings only come through an S-Corp election, which is a separate decision that only makes sense at higher income levels.

The real differences

Factor Sole Proprietor Single-Member LLC
Formation cost $0 — automatic when you start working $35–$500 state filing fee (avg. $132)
Ongoing costs $0 $50–$300/year (annual report + registered agent)
Paperwork None — no state filings required Articles of Organization + operating agreement
Federal taxes (default) Schedule C — SE tax on all net profit Identical — Schedule C, same SE tax
S-Corp election available ❌ No ✅ Yes — enables SE tax savings at higher income
Business bank account Available but often harder to open without LLC Cleaner separation, easier to open business accounts
Client credibility Some clients prefer or require LLC status "LLC" in your name signals business formality
Business credit Can build business credit under EIN Stronger foundation for business credit building

Liability protection — what it actually means

The LLC's defining advantage is the liability shield. As a sole proprietor, you and your business are legally the same entity — if a client sues your business for $200,000, they're suing you personally. Your personal bank accounts, car, and home are theoretically exposed.

An LLC creates a legal separation. Business liabilities stay with the business. Your personal assets are protected from most business claims — with important exceptions.

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When liability protection actually matters for solo operators
Liability risk is profession-dependent. Software developers, marketing consultants, business consultants, and agency owners face real exposure — a bad campaign, a buggy deliverable, or bad advice can lead to six-figure claims. Writers, designers, and virtual assistants face lower risk. The LLC makes most sense when: (1) you have personal assets worth protecting, (2) your work carries professional liability risk, or (3) large enterprise clients require vendor LLC status in their contracts.

One critical caveat: the liability shield only works if you maintain clean separation between business and personal finances. Mixing money, paying personal bills from the business account, or operating informally can allow courts to "pierce the corporate veil" — meaning the protection disappears. An LLC only protects you if you actually run it like a separate entity. That means a dedicated business bank account, separate accounting, and an operating agreement on file.

Taxes — what changes and what doesn't

This is where most online articles mislead solo operators. Here is the accurate picture:

Default LLC taxation is identical to sole proprietor. A single-member LLC is a "disregarded entity" for federal tax purposes — the IRS treats it as if the LLC doesn't exist, and all income flows to your personal Schedule C. You pay the exact same self-employment tax (15.3% on 92.35% of net profit) and income tax as a sole proprietor. Forming an LLC does not reduce your SE tax bill.

The only way to reduce SE tax through your entity structure is the S-Corp election. An LLC can elect to be taxed as an S-Corp — this is a separate IRS election (Form 2553) that changes how the business income is taxed. With an S-Corp, you pay yourself a salary (subject to payroll tax) and take remaining profits as distributions (not subject to SE tax). At high enough income levels, this saves meaningful money. See the S-Corp election guide for the full breakdown.

Sole Proprietor — $100K net profit
SE Tax: ~$14,130 (15.3% × 92.35%)
Income Tax: ~$18,000 (est., single filer)
Total: ~$32,130
Single-Member LLC — $100K net profit
SE Tax: ~$14,130 (identical)
Income Tax: ~$18,000 (identical)
Total: ~$32,130 + $125–$300/yr LLC fees

What an LLC actually costs in 2026

Formation fees vary significantly by state. The cheapest states are Montana ($35), Kentucky ($40), Arkansas ($45), and several states at $50. The most expensive are Massachusetts ($500), Nevada ($425), Tennessee ($300), and Texas ($300). Form in your home state — not in a "cheaper" state — unless you're comfortable maintaining two state filings (a domestic LLC where you live plus a foreign qualification in the cheaper state).

Cost ItemDIYNorthwest Registered Agent
State filing fee$35–$500 (your state)$35–$500 (same state fee)
Formation service$0$39
Registered agent (Year 1)$0 (be your own)Included in $39
Operating agreement$0 (use a template)Included
EIN from IRS$0 (always free at IRS.gov)$0

DIY filing takes 15–30 minutes at your state's Secretary of State website. Northwest Registered Agent charges $39 for LLC formation plus your state filing fee, with registered agent service included in Year 1 and renewing at $125/year. Never pay a third party for an EIN — it's always free at IRS.gov.

When to form an LLC — the honest answer

Form an LLC when your income exceeds ~$30,000/year
Below this level, the LLC's annual costs ($125–$300) are meaningful relative to income, and liability risk is generally lower for newer operators. Once you're earning consistently above $30K, the protection is worth the cost and the credibility advantage becomes relevant for larger clients.
Form an LLC before working with enterprise clients
Many enterprise and mid-market clients require vendor LLC status in their standard contracts. If you're actively pursuing larger clients or have one in hand, form the LLC before signing — don't try to convert mid-engagement.
Form an LLC if your work carries professional liability risk
Software developers, business consultants, marketing agencies, financial consultants, and others whose work could lead to client losses face real liability exposure. Form an LLC — and consider E&O (errors and omissions) insurance as an additional layer — before this risk materializes, not after.
Stay sole proprietor if you're just getting started or testing an idea
If you're earning under $20K/year in freelance income, in a low-liability field, and don't yet have significant personal assets to protect — the sole proprietorship is the right starting point. The $0 cost and zero overhead let you focus on building revenue. You can always form the LLC later; it takes a weekend.

After you form the LLC — what actually needs to happen

Forming the LLC is step one. The liability protection only works if you follow through with the operational requirements.