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S-Corp vs. LLC vs. Sole Prop: The Honest Tax Math for Entrepreneurs | S-Corp tax math, LLC taxes, sole proprietorship tax | Tax Strategy insight from Fat Wallet SalesS-Corp vs. LLC vs. Sole Prop: The Honest Tax Math for Entrepreneurs | S-Corp tax math, LLC taxes, sole proprietorship tax | Tax Strategy insight from Fat Wallet Sales
🧮Tax Strategy3 min read▶ Video

S-Corp vs. LLC vs. Sole Prop: The Honest Tax Math for Entrepreneurs

Cut through the noise on S-Corp, LLC, and Sole Proprietor tax math. Learn the direct financial implications and avoid costly mistakes when choosing your busin

October 3, 2026·Fat Wallet Sales · The Playbook
TL;DR

Choosing Sole Prop, LLC, or S-Corp impacts your taxes directly. Sole props pay full self-employment tax. LLCs offer liability protection and tax flexibility. S-Corps can save significant money on self-employment taxes by splitting income in

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S-Corp vs. LLC vs. Sole Prop: The Honest Tax Math for Entrepreneurs

Choosing your business entity - Sole Proprietorship, LLC, or S-Corp - isn't just about sounding fancy. It's about cold, hard tax math. Get this wrong, and you're leaving thousands on the table, or worse, setting yourself up for an audit. This isn't theoretical; this is about understanding how each structure impacts your wallet, specifically regarding self-employment taxes, payroll, and your overall take-home pay. We're cutting straight to the receipts, no fluff.

Education, not financial advice; always consult a qualified tax professional for your specific situation before making decisions.

The Sole Proprietorship: Simplicity Taxed Heavily

A Sole Proprietorship is the default for most small businesses and freelancers. If you start selling a service or product without registering anything, you're a sole proprietor. The upside? Zero setup costs, minimal paperwork. You just report your income and expenses on Schedule C of your personal Form 1040. Easy. The downside? You are the business, legally and financially. This means unlimited personal liability, which is a massive risk if things go south.

From a tax perspective, every dollar you earn as a sole proprietor is subject to self-employment (SE) tax. That's 15.3% (12.4% for Social Security up to a cap, plus 2.9% for Medicare, no cap) on your net earnings. It's literally the employer and employee share of FICA taxes. You pay both sides. If you net $100,000, you're paying roughly $15,300 in SE taxes before you even factor in income tax. This is often the biggest tax hit for a growing solo entrepreneur.

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A Schedule C form for reporting sole proprietorship income and expenses.
A Schedule C form for reporting sole proprietorship income and expenses.

The DIY Tax Burden

Many sole proprietors make the mistake of ignoring estimated taxes. If you expect to owe more than $1,000 in taxes for the year, the IRS requires you to pay quarterly. Fail to do so, and you're looking at penalties. This means setting aside roughly 25-35% (or more, depending on your income) of every dollar you earn for taxes. It's a discipline most new entrepreneurs lack, leading to a nasty surprise come April 15th. For a service-based business with high profit margins, this tax bill can be brutal.

The LLC: Liability Shield, Tax Flexibility

An LLC (Limited Liability Company) is a legal entity, not a tax entity. This is critical. It offers a liability shield, separating your personal assets from your business debts. That alone is often worth the modest setup fees. But for tax purposes, an LLC is a pass-through entity. By default, a single-member LLC is taxed as a sole proprietorship (disregarded entity), and a multi-member LLC as a partnership. This means the same SE tax burden as a sole proprietor.

Official documents for establishing a Limited Liability Company (LLC).
Official documents for establishing a Limited Liability Company (LLC).

However, the magic of the LLC is its flexibility. You can elect to have your LLC taxed as an S-Corporation. This is where the real tax math starts to get interesting for many entrepreneurs. It's not about avoiding taxes entirely, but about reclassifying income to reduce the crushing self-employment tax burden. This election is made by filing Form 2553 with the IRS.

The S-Corp: Self-Employment Tax Reduction Play

Here’s where the receipts hit the table. An S-Corporation (which can be an LLC elected as an S-Corp, or a corporation formed as an S-Corp) allows you to split your income into two buckets: a reasonable salary and distributions. The salary portion is subject to payroll taxes (FICA), just like any employee's wages. But the distribution portion is NOT subject to self-employment tax.

For example, if your S-Corp nets $150,000, you might pay yourself a

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