This article summarizes general US tax and business-structure rules for informational purposes.

It is not legal or tax advice — actual savings depend on your state, income level, and specific situation, and should be confirmed with a CPA or business attorney before you register anything.

Key Takeaways

Both a sole proprietorship and a default (non-elected) LLC pay the exact same federal tax: ordinary income tax plus 15.3% self-employment tax on net profit — the LLC itself doesn't lower your tax bill on its own.
The 15.3% self-employment tax splits into 12.4% for Social Security, capped on the first $184,500 of net earnings in 2026, and 2.9% for Medicare, which has no cap at all.
Electing S-Corp tax treatment for an LLC is where real savings can appear, since only the "reasonable salary" portion of profit is subject to payroll tax — but the break-even point for most owners sits somewhere between $50,000 and $80,000 in annual net profit, not lower.
The 2026 standard deduction is $16,100 for single filers, $32,200 for married couples filing jointly, and $24,150 for heads of household — and most owners of either structure also qualify for a 20% Qualified Business Income deduction on top of that.
The real reason people form an LLC often has nothing to do with taxes at all: it's the liability shield that keeps a lawsuit against the business from reaching personal assets, something a sole proprietorship simply doesn't offer.

Same tax treatment, different paperwork

This is the part that surprises a lot of new business owners: a single-member LLC that hasn't made any special election is, as far as the IRS is concerned, taxed identically to a sole proprietorship. Both are "disregarded" for federal tax purposes, meaning business profit flows straight through to the owner's personal return on Schedule C. There's no separate business tax return, no double taxation, and — this is the surprising bit — no automatic tax savings just from forming the LLC.

So if the tax treatment is identical, why does anyone bother filing LLC paperwork and paying state formation fees? The answer is liability, not tax. A sole proprietor is personally on the hook for the business's debts and legal judgments — if the business gets sued, a plaintiff can come after personal assets like a house or savings account. An LLC creates a legal separation between the business and the owner, so in most circumstances, only the business's own assets are exposed. That's the whole product. The tax code doesn't care which one you picked; a judge and a creditor very much do.

What the self-employment tax actually costs you

Every dollar of net profit from either structure gets hit twice: once by ordinary federal income tax, and once by self-employment tax. The self-employment tax rate for 2026 holds at 15.3%, split between 12.4% for Social Security and 2.9% for Medicare. The Social Security portion only applies up to $184,500 of net self-employment earnings for the year; the Medicare portion keeps applying no matter how much you earn, with no ceiling.

To make that concrete: on $50,000 of net profit, a sole proprietor or default LLC owner owes self-employment tax of roughly $7,065, calculated on 92.35% of net earnings rather than the full amount (a built-in adjustment meant to mirror the employer-side deduction a traditional employee's company would otherwise absorb). Half of that self-employment tax is then deductible against income tax, which softens the blow slightly but doesn't eliminate it.

Where an S-Corp election actually starts to pay off

This is the strategy most LLC owners eventually hear about: elect to have the LLC taxed as an S-Corporation, pay yourself a "reasonable salary" subject to payroll tax, and take the remaining profit as a distribution that skips self-employment tax entirely. It's a legitimate, IRS-sanctioned strategy — but it isn't free, and it isn't automatically worth it at every income level.

Running payroll adds real costs: payroll processing, a separate business tax return, and stricter bookkeeping requirements, typically adding a few hundred dollars a year in overhead on top of formation costs. At lower profit levels, those added costs can eat up most or all of the tax savings. Guidance from CPAs generally puts the real break-even point somewhere between $50,000 and $80,000 in annual net profit — below that, the administrative cost of running an S-Corp election often isn't worth the modest tax savings it produces; above it, the savings start to meaningfully outpace the overhead.

The deductions available either way

Regardless of which structure you choose, the deduction toolkit looks largely the same, since both report through Schedule C by default. The 2026 standard deduction sits at $16,100 for single filers, $32,200 for married couples filing jointly, and $24,150 for heads of household — money that reduces taxable income before you even get to business-specific write-offs.

On top of that, most owners of either structure can also claim the Qualified Business Income (QBI) deduction, letting them deduct 20% of qualified business income before calculating tax owed, subject to income limits at higher earnings. Bonus depreciation was reinstated at 100% for 2026 under recent legislation, meaning equipment and certain other business purchases can potentially be deducted in full in the year they're bought rather than spread out over several years. Retirement contributions add another lever: a Solo 401(k) allows business owners to contribute significantly more than a standard IRA would permit, sheltering a larger chunk of profit from current-year tax regardless of entity type.

What this means if you're choosing between the two

If your main worry is liability, not tax, the LLC is doing its job even at zero tax savings. The legal separation between personal and business assets is the actual product being purchased with the formation fee — treat any tax benefit as a bonus, not the reason to file.
If you're under roughly $50,000 in net profit, an S-Corp election is probably premature. The payroll and bookkeeping overhead tends to cancel out the tax savings at that income level; a default LLC or sole proprietorship with the standard and QBI deductions usually nets out similarly with far less administrative work.
If you're clearing $80,000 or more in consistent annual profit, it's worth running the actual numbers with a CPA. The gap between self-employment tax on the full amount versus payroll tax on just a reasonable salary tends to widen enough at that level to justify the added complexity.
Either way, don't skip the QBI deduction or retirement contribution planning. These apply regardless of entity choice and are frequently left on the table by owners focused only on the sole-proprietorship-versus-LLC decision itself.

Frequently Asked Questions

Does forming an LLC lower my taxes automatically? No. A default single-member LLC is taxed exactly like a sole proprietorship — same income tax, same 15.3% self-employment tax. Any tax savings only show up if you actively elect S-Corp tax treatment on top of the LLC, which is a separate decision with its own costs.

At what income level should I actually consider an S-Corp election? There's no single number that fits everyone, but most CPA guidance points to somewhere between $50,000 and $80,000 in consistent annual net profit as the range where the payroll and administrative overhead starts to be outweighed by the self-employment tax savings.

Is the self-employment tax the same as what a W-2 employee pays? Not exactly, though it funds the same programs. A W-2 employee splits Social Security and Medicare taxes 50/50 with their employer. A self-employed person, whether a sole proprietor or LLC owner, pays both halves themselves through the 15.3% self-employment tax.

Do I lose the QBI deduction if I elect S-Corp status? Not automatically — S-Corp owners can still qualify for the Qualified Business Income deduction on their share of pass-through profit, though the calculation shifts slightly since part of your income is now W-2 salary rather than Schedule C profit. This is a detail worth confirming with a tax preparer given how income-dependent the QBI phase-out rules are.

Sources & References

SDO CPA, "Self-Employment Tax 2026: Rates, Calculation & How to Reduce"
SDO CPA, "Sole Proprietor Tax Rates 2026: Complete Guide"
Uncle Kam, "LLC vs Sole Proprietorship: 2026 Tax Differences & Business Structure Guide"
Jupid, "Sole Proprietorship vs LLC 2026: Which Structure Saves You More"
Ourtaxpartner.com, "LLC Tax Rate 2026: What You Actually Owe the IRS"
SelfEmployTax.com, "LLC vs S-Corp: Complete Tax Comparison Guide 2026"
Southron Firm, "LLC vs Sole Proprietorship: Which Structure Protects You Best in 2026?"

Sole Proprietorship vs LLC: What the 2026 Tax Numbers Actually Show