A single-member LLC is a disregarded entity: all profit flows to Schedule C and gets hit with 15.3% self-employment tax. Here's how it works and when an S election starts paying.
Here's the answer up front: for federal income tax, a single-member LLC doesn't exist. The IRS calls it a "disregarded entity." All the income and expenses flow straight onto your personal return — Schedule C if it's an operating business — exactly as if you'd never formed the LLC at all. There's no separate business tax return, no corporate rate, and no tax savings from the letters "LLC" by themselves.
That surprises a lot of new owners who formed an LLC expecting a tax upgrade. What the LLC gives you is legal, not tax: liability protection, a cleaner brand, a container for contracts. The tax picture only changes if you elect a different classification — most commonly S corporation status once profits justify it. For the full decision framework, see our pillar guide to LLC vs S Corp vs C Corp in 2026. Here's how the default actually works, and when it stops being the right answer.
As a disregarded entity, your LLC's profit is reported on Schedule C attached to your Form 1040. Revenue minus ordinary and necessary business expenses equals net profit, and that net profit is taxed twice over:
The key phrase is all profit. Every dollar of Schedule C net profit is subject to SE tax whether you spend it, save it, or leave it in the business bank account. There's no concept of a "salary" versus "distributions" for a disregarded entity — that split only exists once you're taxed as an S corp.
You'll also likely owe quarterly estimated taxes, since no employer is withholding for you — payments are due April 15, June 15, September 15, and January 15. The safe harbor is worth memorizing: pay in 90% of the current year's tax or 100% of last year's (110% if your prior-year AGI topped $150,000) and you avoid the underpayment penalty, which runs at the IRS interest rate set quarterly. Miss the estimates and the penalty accrues automatically, even if you settle up in full at filing.
And don't forget the upside: the QBI deduction applies to disregarded-entity profit. Qualified business income from your Schedule C generally gets the permanent 20% deduction, subject to the income thresholds — a real benefit that works automatically at the default classification.
"Disregarded for tax" does not mean "informal in practice." Get an EIN even though the IRS technically lets many single-member LLCs use the owner's SSN — you'll need the EIN to open a business bank account, and it keeps your SSN off W-9s you hand to clients. And a dedicated business bank account isn't optional housekeeping: running business and personal money through one account is the classic mistake that undermines your liability protection and turns bookkeeping into archaeology. We cover why in detail in our guide to business bank accounts and commingling.
The LLC's real job is to separate your business's liabilities from your personal assets. If the business is sued or can't pay its debts, a properly maintained LLC generally keeps the claim from reaching your house and savings. But courts can "pierce the veil" when owners treat the LLC as a personal wallet — commingled funds, no records, undercapitalization. So the legal benefit is real, but it's conditional on behaving like the LLC is a separate thing, even while the IRS pretends it isn't.
One more distinction worth naming: adding your spouse as a member usually converts the LLC into a partnership for tax purposes, with a Form 1065 filing requirement and real penalties for missing it. The rules differ by state — our post on husband-and-wife LLCs and the qualified joint venture explains when two spouses can still file on Schedule C.
Here's the rough logic. Taxed as an S corp, you pay yourself a reasonable salary (subject to payroll taxes) and can take remaining profit as distributions that avoid the 15.3% SE/FICA hit. The savings equal roughly 15.3% of the gap between your profit and your reasonable salary — minus the new costs an S corp brings: payroll processing, a separate Form 1120-S, possibly higher state fees, and more bookkeeping discipline.
That math rarely works at low profit levels, because your reasonable salary would eat most of the profit and the compliance costs eat the rest. As profit climbs comfortably past what you'd have to pay yourself as salary — for many service businesses, that inflection lands somewhere in the high-five-figure to low-six-figure profit range — the annual savings start to meaningfully exceed the added costs. The salary number is the hinge of the whole analysis, and it's not a number you get to invent; our S corp reasonable salary guide covers how to set one that holds up.
Two cautions. First, the S election is a real commitment — payroll every year, on time, no exceptions. Second, QBI interacts with the choice: salary isn't QBI but distributions' underlying profit is, so the S corp shifts the QBI calculation too. Run the numbers both ways before electing.
Federal law disregards your LLC; your state does not. Most states charge annual report fees or franchise taxes just for existing, and some are substantial. California is the famous example: an $800 minimum franchise tax every year, profitable or not. Other states charge modest annual fees, and a few charge essentially nothing. If you operate in multiple states, registration and fees can stack — check where your LLC actually needs to be registered before you form in a state you don't live in.
An LLC changes who can sue you, not how you're taxed. The tax savings only arrive when profits are high enough to justify an S election — and the paperwork that comes with it.
A single-member LLC is taxed exactly like a sole proprietorship: Schedule C, income tax plus 15.3% SE tax on all profit, QBI deduction available, quarterly estimates on you. Form it for the liability protection and the professionalism, keep the money separate, and revisit the S election once profit clears the salary-plus-compliance breakeven.
Taxagon's CPAs and EAs help owners pick the right structure and run the S corp breakeven math through our business formation service — if you'd rather not navigate it alone, reach out.
This article is general information, not tax advice for your specific situation. Tax law changes; figures are for the years stated.
Talk it through with a licensed US tax professional — we'll tell you honestly whether it applies to your situation.
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