A sole proprietorship is the default when you start a business alone — no filing, but no liability protection: your personal assets are exposed to business debts and lawsuits. An LLC is a separate legal entity that shields personal assets and adds credibility, for a $130 Wisconsin state filing fee ($25/year after). Both are pass-through for taxes by default; an LLC can later elect S-corp taxation to cut self-employment tax. For most owners with any real liability or revenue, the LLC's protection outweighs its modest cost.
When you start a business, you have to pick a legal structure. And for most small business owners, the choice comes down to two options: sole proprietorship or LLC. One is automatic and free. The other costs a little to set up. But the differences in protection, taxes, and credibility are significant.
This guide breaks down every meaningful difference so you can make a confident decision.
What Is a Sole Proprietorship?
A sole proprietorship is the default business structure. The moment you start selling a product or service as an individual, without filing anything with the government, you're a sole proprietor. There's no paperwork, no state filing fee, and no formal structure.
That simplicity is the appeal. But it comes with a serious tradeoff: there is no legal separation between you and your business. Your business is you. That means your personal assets, your savings, your car, your home, are fully exposed to any business debts or lawsuits.
What Is an LLC?
A Limited Liability Company (LLC) is a legal entity that exists separately from its owners (called "members"). To form one, you file Articles of Organization with your state and pay a filing fee. In Wisconsin, that fee is $130, and the entity is governed by Wis. Stat. ch. 183 (the Wisconsin Uniform Limited Liability Company Law).
The "limited liability" part is the key feature: if your LLC is sued or goes into debt, your personal assets are generally protected. Creditors can only go after business assets. Not your personal bank account or home.
An LLC also gives you flexibility in how you're taxed and how you structure ownership, which matters as your business grows.
Side-by-Side Comparison
| Factor | Sole Proprietorship | LLC |
|---|---|---|
| Personal liability protection | None | Yes. Strong protection |
| Formation cost | Free | $130 WI state fee ($159 with Anchor) |
| Annual compliance | Minimal | $25 annual report |
| Default taxation | Pass-through (Schedule C) | Pass-through (Schedule C or Form 1065) |
| S-Corp election available | No | Yes |
| Business bank account | Harder to open | Easy with EIN + LLC docs |
| Credibility with clients | Lower | Higher |
| Multiple owners allowed | No | Yes |
| Business credit building | Difficult | Yes |
Liability Protection: The Most Important Difference
This is the big one. As a sole proprietor, you are your business. If a client sues you, if a customer is injured by your product, if a vendor takes you to court. They're suing you personally. Your personal savings, vehicle, and home are all on the table.
With an LLC, the business is a separate legal entity. A lawsuit against the LLC is a lawsuit against the business. Not against you personally. As long as you maintain the separation (keeping business and personal finances separate, not signing contracts personally on behalf of the LLC, etc.), your personal assets are shielded.
An LLC's liability protection can be lost if you commingle personal and business funds, fail to follow basic formalities, or use the LLC for fraud. Keep your business bank account separate and conduct business in the LLC's name.
Taxes: More Similar Than You Think (With One Key Difference)
By default, both a sole proprietorship and a single-member LLC are taxed the same way: income flows through to your personal tax return on IRS Schedule C, and you pay self-employment taxes (15.3%) on all net profit. The IRS's LLC tax classification page covers the defaults in detail.
The critical difference: an LLC can elect to be taxed as an S-Corporation by filing IRS Form 2553. With an S-Corp election, you pay yourself a reasonable salary (subject to payroll taxes) and take the rest of your profit as a distribution. Which is not subject to self-employment tax. For many business owners with $50,000+ in annual profit, this saves thousands of dollars per year.
A sole proprietorship cannot make an S-Corp election. That option is permanently off the table.
If you net $80,000/year as a sole proprietor, you pay 15.3% SE tax on all $80K. With an LLC taxed as an S-Corp, you pay yourself $45K salary (SE taxes apply) and take $35K as a distribution (no SE tax). Potentially saving $5,000+ per year.
Cost Comparison
Sole proprietorships are free to start (though you may need a local business license or DBA registration). LLCs have an upfront state filing fee · $130 in Wisconsin. Plus a $25 annual report fee each year.
At Anchor Filings, Wisconsin LLC formation is $159 all-inclusive (includes the $130 state fee). That one-time investment buys you liability protection and tax flexibility that a sole proprietorship simply cannot provide.
Think of it this way: the cost of one LLC formation is less than one hour of attorney time if something goes wrong and you're operating without protection.
Credibility and Banking
Clients, banks, and vendors treat businesses differently depending on their structure. An LLC signals that you're serious, that you've invested in your business, and that you operate with a degree of formality. A sole proprietor, especially one operating under their own name, often has a harder time winning larger clients or contracts.
Opening a dedicated business bank account is also far easier with an LLC. Most banks require an EIN and formation documents to open a business checking account. While some banks will open accounts for sole proprietors, the process is inconsistent and some won't do it at all.
When a Sole Proprietorship Makes Sense
A sole proprietorship is reasonable if you're:
- Testing a business idea before committing to formal structure
- Doing a small amount of very low-risk work (e.g., occasional odd jobs for neighbors)
- In a jurisdiction where you plan to upgrade to an LLC within months
In almost every other situation, if you have paying clients, sign contracts, sell products, or carry any meaningful liability risk, an LLC is the better choice.
When an LLC Is the Clear Choice
Form an LLC when you:
- Have paying clients or customers
- Sign contracts in the course of business
- Sell products (product liability risk is real)
- Have a business partner or plan to bring one on
- Want to open a business bank account
- Want your business to look legitimate to clients, vendors, or lenders
- Expect to grow income to the point where S-Corp taxation saves money
Form Your LLC for $159
Anchor Filings handles Wisconsin LLC formation from start to finish. State fee included, no surprises, documents delivered to your secure portal.
Get StartedAll-inclusive · $130 WI state fee included · No hidden costs
Frequently Asked Questions
Yes, in most cases. You don't need to file anything with the state to operate as a sole proprietor. You just start working. You may need a local business license or a DBA registration if you use a name other than your own, but there's no state filing fee.
An LLC protects your personal assets from business debts and most business-related lawsuits. However, it doesn't protect you from personal negligence. If you personally cause harm through your own reckless action, you can still be held personally liable.
Yes. You can form an LLC at any time and transfer your business assets and contracts to it. Many business owners start as sole proprietors and upgrade to an LLC once they have paying clients or meaningful assets to protect.
Not by default. A single-member LLC is taxed identically to a sole proprietorship. Income passes through to your personal return. The difference is that an LLC can elect S-Corp status to reduce self-employment taxes once your income is high enough (generally $50K+ in annual profit).
An LLC is almost always better for a freelancer or side hustler who has paying clients, signs contracts, or carries any liability risk. The cost of an LLC ($159 in Wisconsin) is low compared to the protection it provides. And it signals legitimacy to clients.
