I get asked about the US constantly. Usually by people trying to leave it. But if you’re operating there—or thinking about it—understanding the sole proprietorship is non-negotiable. It’s the default. The path of least resistance. And in a country where the IRS has more power than most small nations’ militaries, you need to know exactly what you’re walking into.
The sole proprietorship in the United States isn’t some obscure legal structure. It’s the most common business form in the country. No registration paperwork with the state (in most cases). No separate legal entity. You are the business. The business is you. Simple, right?
Sure. Until tax season hits.
What Exactly Is a Sole Proprietorship in the US?
A sole proprietorship is an unincorporated business owned and run by one individual. There’s no legal distinction between you and your business. You report business income on your personal tax return. You’re personally liable for all debts and obligations.
No formation documents required. You start freelancing? Congratulations, you’re a sole proprietor. You sell products online under your own name? Same thing. The IRS considers you self-employed the moment you begin generating income with the intent of making a profit.
Now, you might need local business licenses or a “Doing Business As” (DBA) name if you’re operating under something other than your legal name. But structurally? You’re already in business the second you invoice your first client.
The Tax Reality: Prepare to Pay
Let me be blunt. The US tax system for sole proprietors is punishing if you’re not prepared. You’re hit from multiple angles.
First, your business income is taxed at your individual marginal tax rates. These range from 10% all the way up to 37% depending on your total income. There’s no corporate buffer. No flat rate. You’re taxed as an individual, which means the more you earn, the higher your bracket climbs.
Second—and this is where it gets painful—you owe self-employment tax. This is 15.3% on 92.35% of your net earnings. Why 15.3%? Because you’re paying both the employee and employer portions of Social Security (12.4%) and Medicare (2.9%). When you work for someone else, they cover half. When you work for yourself, you cover it all.
Let me give you an example. Say you net $80,000 in profit as a sole proprietor. You’ll owe roughly $11,304 in self-employment tax alone. Then you add your income tax on top of that. If you’re in the 22% bracket, that’s another $17,600. You’re looking at close to $29,000 in total federal taxes. Before state taxes. Before local taxes.
That’s the game.
The QBI Deduction: A Rare Gift
There is one silver lining, and it’s significant if you qualify. The Qualified Business Income (QBI) deduction allows many sole proprietors to deduct up to 20% of their business income before calculating income tax. Not self-employment tax—just income tax.
This was introduced under the Tax Cuts and Jobs Act and it’s still in effect as of 2026. If you’re a consultant, a freelance designer, a contractor—most service businesses qualify. Some high-income earners in specified service trades face phaseouts, but for the majority, this deduction is accessible.
Using the same $80,000 example: you’d deduct $16,000 (20% of $80,000), lowering your taxable income to $64,000. That saves you around $3,520 in federal income tax if you’re in the 22% bracket. Not life-changing, but not nothing either.
No Turnover Limit, No Safety Net
Unlike some jurisdictions that cap sole proprietorship turnover or require you to incorporate once you hit a threshold, the US has no such limit. You can run a sole proprietorship generating $50,000 or $5,000,000. Legally, nothing stops you.
But that’s also the trap. Because as your income grows, so does your liability. And I mean total liability. Someone sues your business? They can come after your house. Your car. Your personal savings. There’s no corporate veil. You are exposed.
This is why I always tell clients: if you’re generating serious revenue or operating in any industry with litigation risk (construction, consulting, anything client-facing), you need to consider an LLC or S-Corp structure. The sole proprietorship is convenient. It is not protective.
Record Keeping and Quarterly Taxes
The IRS expects you to pay taxes as you earn. That means quarterly estimated tax payments. Miss them, and you’ll face underpayment penalties. These are due in April, June, September, and January of the following year.
You’re also responsible for meticulous record keeping. Every receipt. Every mileage log. Every business expense. The IRS can audit you up to three years after filing (or six if they suspect substantial underreporting). And trust me, they’re efficient when money is involved.
I recommend separating your finances immediately. Open a dedicated business bank account even if you’re not legally required to. Use accounting software. Track everything. The $15/month subscription to QuickBooks or Wave will save you thousands in penalties and CPA fees down the line.
When Does a Sole Proprietorship Make Sense?
I’m not anti-sole-proprietorship. It has its place. If you’re just starting out, testing a business idea, or operating as a low-risk freelancer with modest income, it’s the fastest way to get moving. No formation fees. No annual reports. No board meetings.
But it’s a starting point, not a long-term strategy. Once you hit $50,000–$75,000 in net income, you should seriously evaluate whether an LLC or S-Corp structure would save you on self-employment taxes and provide liability protection. The crossover point varies, but the calculus is straightforward: if the tax savings exceed the cost of formation and compliance, you move.
The Cynical Take
The US makes it incredibly easy to become a sole proprietor. They make it incredibly expensive to stay one. The self-employment tax alone is a wealth extraction mechanism that punishes small operators while multinational corporations engineer their way to single-digit effective rates.
That’s not conspiracy. That’s tax code.
If you’re serious about building wealth in the US system, you need to outgrow the sole proprietorship as quickly as possible. Use it to bootstrap. Use it to validate your concept. But don’t let inertia keep you there once the numbers justify a more sophisticated structure.
The IRS offers a detailed overview of sole proprietorships on their official site, and the Small Business Administration provides guidance on choosing the right structure. Both are worth reading if you’re new to this.
Bottom line: the sole proprietorship is accessible, flexible, and tax-heavy. It’s a tool. Use it wisely. Then graduate.