Tax benefits · Last reviewed September 24, 2026
LLC vs S Corp tax benefits: what the structure actually changes.
The federal tax benefit of the S-Corp election is narrower than most marketing pages claim. This page lists the things the structure decision actually moves — and the things it doesn't.
Six specific tax benefits to understand
Benefit #1
Payroll-tax shield on distributions
The biggest federal tax benefit of the S-Corp election.
An LLC taxed as a default sole proprietor pays 15.3% self-employment tax on 92.35% of net earnings. An S-Corp owner-employee pays FICA only on the W-2 salary. The remaining profit taken as a distribution is free of the 15.3% payroll / SE layer — only ordinary federal (and state) income tax applies.
Example · At $100K net profit with a $50K W-2 salary, the federal payroll-tax delta is approximately $10,304/yr — the LLC SE tax of $14,129 minus the S-Corp employer-side FICA of $3,825.
Benefit #2
QBI deduction preserved
S Corp status does not eliminate §199A eligibility.
Section 199A (the qualified business income deduction) is available to pass-through entities — sole proprietorships, partnerships, S Corporations, and most LLCs. C Corporations are explicitly excluded. If you expect to claim QBI, an S-Corp election preserves it; a C-Corp election does not. The election does change the W-2 wage / UBIA components of the §199A limitations at higher income levels.
Example · QBI is not modeled in the BizTaxMetrics calculator. Run the calculator for the federal payroll-tax piece, then have a CPA model the full QBI impact at your income level.
Benefit #3
Predictable entity-level tax treatment
What you see is what you file.
Both an LLC and an S Corporation are pass-through entities — no entity-level federal income tax. Profit flows to the owner's Form 1040 either way (Schedule C for an LLC, Schedule K-1 for an S Corp). The benefit is predictability: your entity-level tax bill is $0 regardless of profit, and the payroll-tax difference is the only federal layer the structure decision can move.
Example · Contrast with a C Corporation, which pays a flat 21% federal corporate income tax on profit, plus a second layer of tax when dividends are paid.
Benefit #4
Half-of-SE-tax deduction (LLC side)
An LLC-specific above-the-line adjustment.
An LLC owner can deduct half of self-employment tax as an above-the-line adjustment on Schedule 1. This reduces the effective marginal cost of SE tax on the owner's income tax. The same deduction does not apply to S-Corp owner-employees (their 'employer half' of FICA is already paid by the S Corp as a business expense, not by the individual).
Example · At $100K net profit / $14,129 SE tax, the LLC owner deducts ~$7,065 above-the-line. This partially offsets the SE tax cost on a marginal-income-tax basis — and is NOT modeled in the BizTaxMetrics calculator.
Benefit #5
Self-employed health insurance deduction (LLC side, with caveats)
Premiums deductible above the line, capped by net SE earnings.
LLC owners can deduct 100% of self-employed health insurance premiums above the line on Schedule 1, capped by net SE earnings. S-Corp owner-employees can deduct premiums via the S Corp's Section 162 plan, but the mechanics differ. Both paths are valuable; the dollar amount can differ.
Example · Not modeled in the BizTaxMetrics calculator. Confirm with a CPA based on your health-insurance premiums and the entity structure.
Benefit #6
Retirement-plan contribution differences
Solo 401(k), SEP-IRA, and SIMPLE IRA contribution limits differ.
An LLC owner (Schedule C) calculates retirement-plan contributions based on net SE earnings. An S-Corp owner-employee calculates them based on W-2 wages from the S Corp. The contribution limits differ — usually in the S-Corp owner's favor at higher compensation levels, but the specifics depend on the plan type.
Example · Not modeled. The BizTaxMetrics calculator focuses on the federal payroll-tax piece only.
What the S-Corp election does not change
Many marketing pages overstate the benefit. The S-Corp election does not:
- Federal income tax. The S-Corp election does not change your federal income tax bracket or the rate applied to your earnings. Both an LLC and an S Corp pay ordinary federal income tax on the same net earnings.
- State income tax. Most states assess individual income tax on pass-through business income at the owner's level. The election does not exempt the distribution from state income tax (only from the 15.3% payroll / SE layer).
- Eliminating all payroll taxes. The W-2 salary you pay yourself is still subject to FICA. The benefit applies only to the distribution portion above the salary.
- Avoiding recordkeeping. Both structures require bookkeeping; an S Corp requires more (payroll records, Form 941, Form 1120-S).
- Avoiding self-employment tax entirely. The S Corp reduces, but does not eliminate, SE-style taxes on owner compensation. The W-2 salary portion still pays FICA.
Frequently asked questions
What is the biggest tax benefit of an S Corp?
The biggest federal tax benefit of an S-Corp election is the payroll-tax shield on distributions — the portion of profit taken as a distribution (after the W-2 salary) is not subject to the 15.3% self-employment / FICA tax.
Does an LLC have any tax benefits over an S Corp?
Yes, in three places. (1) Simplicity — no payroll, no separate federal return. (2) The half-of-SE-tax above-the-line deduction. (3) Self-employed health insurance deduction mechanics that may be more favorable at certain income levels. None of these are modeled in the BizTaxMetrics calculator.
Does the S-Corp election lower my income tax?
No. The election does not change the federal income tax rate on your earnings. It changes only the 15.3% self-employment / FICA layer.
Can I take the QBI deduction with an S Corp?
Yes. Section 199A QBI is available to S Corporations and to default-taxed LLCs. C Corporations are excluded. The §199A calculation is more complex for S Corps because of the W-2 wage / UBIA limitations.
Is the S-Corp election worth it at low profit?
Usually not. Below ~$60K net profit, the modeled $1,200/yr admin overhead often cancels the federal savings. Above ~$80K, the savings scale meaningfully. There is no fixed IRS threshold.
Model the federal payroll-tax benefit for your numbers.
The BizTaxMetrics calculator focuses on the one federal layer the structure decision actually moves — the 15.3% self-employment / FICA tax. Updated for tax year 2026.