The verdict: if your business carries any real liability, signs contracts, or handles other people's money, form an LLC. A sole proprietorship is the right call only for a low-risk side project where the cost and upkeep of an LLC would outweigh the protection it buys. For most solo founders building something they intend to keep — and especially anyone selling across borders or getting paid in USDC — the LLC's liability shield, separate legal identity, and clean financial paper trail are worth the modest annual cost.
Sole proprietorship = no formation, no filing fee, no separate tax return; you and the business are legally the same person, so your personal assets are exposed.
LLC = a separate legal entity that shields your personal assets, costs a one-time filing fee plus annual upkeep, and is filed with a state Secretary of State.
A Wyoming LLC runs about $100–$110 to form and ~$299–$399/year all-in — small money for a real liability shield.
By default a single-member LLC is taxed exactly like a sole proprietorship (pass-through), so the LLC adds protection without changing your tax treatment.
For non-US founders, only the LLC gives you a separate entity to get an EIN, open a US bank account, and run compliant USDC off-ramps — a sole proprietorship abroad can't.
Choose sole prop for a low-stakes side hustle; choose LLC the moment liability, contracts, or cross-border money are involved.
This is general information, not legal or tax advice; entity rules vary by state and your situation. Confirm with a US attorney or CPA before you choose. Costs are current as of June 2026.
What actually separates the two?
The core difference is one word: separation.
A sole proprietorship is not an entity you create — it is what you automatically are the moment you start doing business under your own name without forming anything. There is no wall between you and the business: its debts are your debts, its lawsuits are your lawsuits, and its income flows straight onto your personal tax return.
An LLC is a legal entity you create by filing with a state. It exists separately from you, which means business creditors and lawsuits generally reach only the business's assets, not your personal savings, home, or other property — the "limited liability" the name promises. That single line of separation is the entire reason the LLC exists, and it is what a sole proprietorship can never give you.
Sole proprietorship vs LLC: the comparison
Here is the decision in one view. The numbers for the LLC column use a Wyoming LLC, the default StableCorp recommends for solo and bootstrapped founders.
| Factor | Sole proprietorship | LLC (Wyoming, single-member) |
|---|---|---|
| Personal liability | Unlimited — personal assets exposed | Limited — personal assets shielded |
| Setup cost | $0 — nothing to file | ~$100–$110 one-time filing fee |
| Annual upkeep | $0 | ~$299–$399 all-in (incl. registered agent + annual report) |
| Separate legal entity | No — you are the business | Yes — distinct legal person |
| Default tax treatment | Pass-through on your 1040 | Pass-through (same as sole prop by default) |
| Separate tax return | No | Foreign-owned: Form 5472 + pro forma 1120 required |
| EIN / US bank account | Hard to separate from you | Clean EIN, dedicated business bank account |
| Credibility with clients | Lower — looks informal | Higher — a real registered entity |
| Best for | Low-risk side project | Anything with liability, contracts, or cross-border money |
Two rows deserve a caveat. First, the LLC's tax simplicity holds for US owners; a **foreign-owned single-member LLC must file Form 5472 with a pro forma 1120 every year, even with $0 of activity — and the penalty for missing it is $25,000 per form.** Second, an LLC needs an EIN before it can open a US business bank account — applications without one are rejected outright.
Choose a sole proprietorship if…
Sole prop wins when the stakes are genuinely low and simplicity is the whole point.
You're testing a side project or freelancing in a low-risk field where a lawsuit is unlikely.
You want zero setup cost, zero filing, and zero annual paperwork.
You're not signing meaningful contracts, holding client funds, or carrying inventory.
Your revenue is small enough that ~$300/year of LLC upkeep isn't yet justified.
You're a US resident who can already get paid and banked under your own name.
The honest trade-off: you keep every dollar of setup cost, but you keep every dollar of personal risk too. The day a client, a vendor, or a regulator has a claim, there is no entity standing between them and your personal assets.
Choose an LLC if…
An LLC wins the moment your business touches real money, real contracts, or real risk.
You want your personal assets protected from business debts and lawsuits.
You sign client contracts, handle customer data, or hold other people's money.
You're building something you intend to keep and grow, not just test.
You're a non-US founder who needs a US entity to get an EIN, open a US bank account, and receive USD or USDC.
You want a clean separation between business and personal finances — easier accounting, easier audits, easier exit.
For founders outside the US, the LLC isn't just nice to have — it's the only path to a compliant US financial stack. A sole proprietorship abroad can't get a US EIN, can't open a US business bank account, and can't run a clean, purpose-coded USDC off-ramp; an LLC can. That paper trail is what keeps cross-border stablecoin income on compliant rails instead of in the grey area of a personal wallet.
What an LLC unlocks for cross-border founders
This is where the choice stops being academic.
If you're getting paid from US clients — in USD or in USDC — a US LLC gives you an entity that can hold an EIN, open a business account with providers like Mercury or Relay, and route stablecoin payouts on chains like Solana, Ethereum, or Polygon. From there, a compliant off-ramp moves that money to your local currency with a proper paper trail, not a wallet-to-bank guess.
This is exactly the stack StableCorp builds: formation of a Wyoming LLC, the EIN filing, the US bank account, and USD + USDC/USDT payments, all on compliant rails. For clients incorporated with StableCorp, off-ramps run at 0.5% and on-ramps at 1.5% — versus a market norm of roughly a 2.9% headline fee plus ~2% hidden FX markup, about 5% effective. See pricing for the full breakdown.
The bottom line
Pick the structure that matches your risk, not your mood.
If you're running a tiny, low-risk side project and want to stay frictionless, a sole proprietorship is a defensible starting point. The moment your business carries liability, signs contracts, handles money for others, or crosses a border, the LLC's protection and clean entity status are worth far more than the ~$300 a year they cost.
Ready to set one up? Walk through the mechanics step by step in the full guide, or let StableCorp form your Wyoming LLC, file the EIN, and open the bank account — see pricing.
Sources
IRS — About Form 5472 (foreign-owned US entities) — https://www.irs.gov/forms-pubs/about-form-5472
IRS — Single Member Limited Liability Companies — https://www.irs.gov/businesses/small-businesses-self-employed/single-member-limited-liability-companies
IRS — Sole Proprietorships — https://www.irs.gov/businesses/small-businesses-self-employed/sole-proprietorships
Wyoming Secretary of State — Business Center — https://sos.wyo.gov/Business/Default.aspx
IRS — Apply for an Employer Identification Number (EIN) — https://www.irs.gov/businesses/small-businesses-self-employed/apply-for-an-employer-identification-number-ein-online