LLC vs. S-Corp: How to Actually Decide

The Real Mechanism Behind "S-Corp Saves You Money"

You'll find this claim everywhere: "electing S-Corp status saves self-employed people money." It's true, but the reason is narrower than most explanations make it sound.

As a sole proprietor or a default-taxed LLC, 100% of your net business profit is subject to self-employment (SE) tax: 15.3% — 12.4% Social Security (up to the annual Social Security wage base) plus 2.9% Medicare (2.9% + an additional 0.9% above the Medicare surtax threshold) — assessed on 92.35% of net earnings, per IRS Schedule SE.

An S-Corp election changes nothing about your entity itself (LLC remains an LLC under state law); it's a *federal tax election* (IRS Form 2553) layered on top. Once elected, the IRS requires you to pay yourself "reasonable compensation" — a W-2 salary reflecting fair market value for the work you actually perform — before taking any further profit as a distribution. That W-2 salary is subject to ordinary payroll FICA (both employer and employee halves, which the owner effectively pays either way). But anything paid out as a distribution above that salary is not subject to self-employment or payroll tax at all. That gap — profit that becomes an untaxed-by-FICA distribution instead of a fully SE-taxed dividend of profit — is the entire savings mechanism.

Why It Doesn't Pay Off at Every Income Level

S-Corp status isn't free. Electing it requires running actual payroll (with the withholding, remittance, and reporting that implies), and filing a separate corporate return (Form 1120-S) in addition to your personal return — typically adding a few hundred to a few thousand dollars a year in payroll and tax-prep costs, depending on complexity.

The savings only materialize on the gap between your total profit and your "reasonable salary." If nearly all your profit has to be paid out as salary anyway (because that's genuinely what the work is worth), there's little room left to convert into a tax-free-of-FICA distribution — and the added administrative cost can exceed the savings. In practice, S-Corp election tends to become worthwhile once net profit clears roughly $60,000-$80,000, with the advantage growing as profit rises further above a reasonable salary for the work performed. The LLC vs. S-Corp Tax Savings Calculator models your specific numbers — profit, a reasonable salary you set, state tax rate, and the extra S-Corp administrative cost — rather than relying on a rule of thumb.

The "Reasonable Compensation" Trap

Setting your S-Corp salary artificially low to shrink your payroll-tax base is one of the most well-documented audit triggers in small-business tax. Per IRS guidance on S-Corp compensation, payments to a corporate officer for services are treated as wages — subject to employment tax — to the extent they represent reasonable compensation, regardless of what label the paperwork uses. The IRS can and does reclassify distributions as wages after the fact, with back payroll taxes, penalties, and interest attached.

There's no single bright-line formula for "reasonable" — factors include what comparable roles pay in your industry and region, your own qualifications, and the time you actually devote to the business. The safer approach is picking a defensible number (comparable-role salary data is a common benchmark) and documenting the reasoning, rather than minimizing it for tax purposes alone.

1099 vs. W-2: The Same Tax Math, From the Other Direction

The same self-employment tax mechanics show up whenever you're comparing a 1099 contractor role against a W-2 job offer for similar work. As a W-2 employee, your employer pays half of your FICA (7.65% of wages) and separately funds benefits like health insurance and a 401(k) match. As a 1099 contractor, you owe the full 15.3% SE tax yourself, and you typically have to self-fund health insurance and forgo an employer match entirely — though you can deduct ordinary business expenses and half of your SE tax, and contractor rates are often quoted higher than comparable W-2 salaries specifically to offset this gap.

Because the "which is actually worth more" answer depends entirely on the size of that gap for your specific offers, don't estimate it by hand — the 1099 vs. W-2 Take-Home Pay Calculator solves directly for the 1099 rate that would match a given W-2 offer's total value, accounting for taxes and lost benefits together.

Quarterly Estimated Taxes: The Payment Side of the Equation

Whichever structure you choose, if you expect to owe $1,000 or more for the year after withholding, the IRS generally requires quarterly estimated payments (Form 1040-ES) rather than one lump sum at filing time. The four payment periods are due April 15, June 15, September 15, and January 15 of the following year (shifting to the next business day if a date falls on a weekend or holiday).

The safe-harbor rule that avoids an underpayment penalty regardless of your actual final bill: pay, over the year, the lesser of 90% of this year's total tax or 100% of last year's total tax (110% if your prior-year AGI exceeded $150,000). S-Corp owner-employees generally satisfy part of this through payroll withholding on their salary, then true up the rest quarterly on distribution income; sole proprietors and default-taxed LLCs pay the full estimate quarterly. Either way, the Quarterly Estimated Tax Calculator computes your safe-harbor target and per-quarter payment directly from your numbers.

Retirement Accounts Change With Your Entity Choice Too

Your entity/election choice also affects which retirement accounts fit best. A Solo 401(k) lets a self-employed person with no employees (other than a spouse) contribute in two roles: up to $24,500 as "employee" for 2026 (plus catch-up if 50+), and up to roughly 20% of net self-employment earnings as "employer" profit-sharing — combined, capped at the overall $72,000 IRC Section 415(c) limit for 2026 (plus catch-up), per IRS Notice 2025-67.

A SEP IRA is simpler to administer but is funded entirely by the employer-side contribution (no employee deferral option), so it typically allows a lower total at the same income compared to a Solo 401(k) — though it's often the easier choice for an S-Corp owner-employee who wants to contribute a straightforward percentage of W-2 salary. If you elect S-Corp status, your solo retirement plan contribution is calculated on your W-2 salary rather than net self-employment earnings, which is one more reason the salary you set has ripple effects well beyond payroll tax. Compare your options with the Solo 401(k) Calculator and SEP IRA Calculator.