Self-Employment Tax vs. S-Corp Calculator: What You'll Actually Save

If you're running a profitable LLC and asking whether an S-corp election would lower your tax bill, the short answer is: it depends on how much of your profit you'd have to pay yourself as salary. As a default LLC, every dollar of net profit is hit with 15.3% self-employment tax. Elect S-corp status, and only the portion you pay yourself as a reasonable salary gets taxed that way — the rest comes out as distributions, free of self-employment tax. The catch is that running payroll and staying compliant as an S-corp isn't free, so the savings only show up once your profit clears a certain threshold. Below, we walk through the math with real numbers so you can see where you land.

How Self-Employment Tax Works for LLCs

A single-member or multi-member LLC taxed by default (disregarded entity or partnership) doesn't pay corporate tax or payroll tax. Instead, the owner pays self-employment tax on their share of the business's net profit, reported on Schedule SE with their personal return.

The 15.3% rate explained

Self-employment tax is 15.3% of your net earnings, made up of 12.4% for Social Security and 2.9% for Medicare, according to the IRS. There's one adjustment worth knowing if you're using a self-employment tax calculator with deductions: the IRS applies the rate to 92.35% of your net profit, not 100%, to roughly mirror what a W-2 employer would withhold. So if you're asking "how much is self employment tax" on, say, $100,000 in net profit, the taxable base is $92,350, not the full $100,000.

The Social Security wage base

The 12.4% Social Security portion only applies up to a yearly wage base — for 2026, that cap is $184,500, up from $176,100 in 2025, following the Social Security Administration's cost-of-living adjustment. The 2.9% Medicare portion has no cap, and high earners may also owe the Additional Medicare Tax of 0.9% above certain thresholds. If your net profit is well under $184,500, the full 15.3% effectively applies to nearly all of it (after the 92.35% adjustment). If you're above that cap, your self-employment tax rate calculator math gets a little more favorable on the portion above the wage base, since only the 2.9% Medicare piece keeps applying.

How an S-Corp Election Changes the Math

Filing Form 2553 to elect S-corp tax treatment doesn't change your legal entity — your LLC stays an LLC — but it changes how the IRS taxes your profit. Instead of all profit being subject to self-employment tax, you split it into two buckets.

Reasonable salary vs. distributions

As an S-corp owner who actively works in the business, you're required to pay yourself a reasonable salary — roughly what the IRS considers fair compensation for the work you do, given your role, industry, and experience. That salary runs through payroll and is subject to the same 15.3% in combined Social Security and Medicare taxes (split as 7.65% withheld from your paycheck and 7.65% paid by the business). Any profit left over after salary and business expenses can be taken as a distribution, which is not subject to self-employment or payroll tax at all — only ordinary income tax. That's the entire mechanism behind the savings: the bigger the gap between your total profit and your reasonable salary, the more you shelter from the 15.3% tax.

The payroll and compliance costs you'll add

None of this is free. Once you elect S-corp status, you're required to run actual payroll, which means withholding and depositing payroll taxes, filing quarterly Form 941s, issuing a W-2, and often paying for a separate payroll service or added bookkeeping. On top of that, S-corp returns (Form 1120-S) are generally more involved — and more expensive to prepare — than a Schedule C. Across the examples published by accounting firms that run these numbers for clients, that added cost typically lands between $2,000 and $4,000 a year combined. That number isn't something we can verify beyond what's publicly reported by other firms, so treat it as a planning range rather than a guarantee for your situation.

Self-Employment Tax vs. S-Corp: A Side-by-Side Example

Here's a concrete example using $150,000 in net profit and a $70,000 reasonable salary — a split that's plausible for many service-based LLC owners, though your own reasonable salary depends on your role and market.

At this profit level, the election pays off. But drop the reasonable salary requirement higher — say to $110,000 because that's genuinely what the role commands in your market — and the gap between salary and distributions shrinks, the self-employment tax savings shrink with it, and the added payroll costs can eat most or all of the benefit.

Is S-Corp Worth It for You? What to Check Before Electing

• Your real profit margin, not revenue. The election only saves money on the gap between net profit and reasonable salary — if your profit barely covers a fair salary for your work, there's nothing left to shelter as distributions.
• What a reasonable salary actually looks like for your role. The IRS can reclassify distributions as wages (with back payroll taxes and penalties) if your salary looks artificially low for the work you do — this is the most common audit risk tied to the election.
• State-level taxes on S-corps. Some states charge franchise taxes, minimum fees, or city-level taxes on S-corps that don't apply to default LLCs, which can offset part of the federal savings.
• Your bandwidth for payroll compliance. Missed payroll tax deposits or late Form 941 filings carry their own IRS penalties, so this only works if you have a system that keeps payroll on schedule.
• Whether your profit is likely to stay above the threshold. A one-year profit spike usually isn't a good reason to elect; the math works best when the income level is expected to hold.

Checking your entity options against your actual numbers — rather than a flat rule of thumb — is worth doing before you file anything. Kangaroo ERP's entity type comparison walks through how different structures handle tax at a glance, and the tax engine can help you model estimated taxes under both scenarios before you commit.

What Happens After You Elect: The Payroll You'll Need

This is the step most calculators skip, and it's the one that actually determines whether the savings show up in practice. Once Form 2553 is filed and accepted, you're not just an LLC owner taking draws anymore — you're an employer. That means setting up a payroll schedule, withholding federal and state income tax plus FICA from your own paycheck, depositing the employer's matching share, filing Form 941 every quarter, and issuing yourself a W-2 at year-end. Get the reasonable salary number wrong, or miss a deposit deadline, and the tax savings from the election can disappear into penalties.

This is exactly where Kangaroo ERP's payroll module fits once you've decided the numbers work: it helps you set up and run your reasonable-salary payroll and tracks your payroll obligations and deadlines, so you're not managing the W-2, the withholding, and the filing calendar by hand on top of everything else.

Frequently Asked Questions

At what income level does an S-corp election start to make sense?
There's no single number that applies to everyone, because it depends on your reasonable salary, not just your profit. As a rough pattern in the examples accounting firms publish, the election tends to start paying off once net profit is comfortably above what a fair salary for your role would be — often cited around the $80,000-$100,000 range for many service businesses — but that's a planning signal, not a rule, and it should be checked against your actual numbers.

How much self-employment tax do I pay as a default LLC?
15.3% of 92.35% of your net profit, up to the Social Security wage base ($184,500 for 2026), plus 2.9% Medicare tax with no cap on the full adjusted amount. On $100,000 in net profit, that works out to roughly $14,130.

Do I still pay self-employment tax if I elect S-corp status?
Not technically — once you elect S-corp status, you pay payroll taxes (Social Security and Medicare) on your salary instead of self-employment tax, at the same combined 15.3% rate, split between employee and employer shares. Your distributions aren't subject to either.

What counts as a reasonable salary for an S-corp owner?
The IRS doesn't publish a fixed formula. It looks at what similar businesses pay someone doing your job, your training and experience, the time you devote to the business, and what you'd pay a replacement to do the same work. Documenting how you arrived at the number is part of defending it if it's ever questioned.

Informational content. It does not replace professional advice on your specific case.

Keep reading

LLC & Self-Employment TaxesLLC Partnership Tax Software: What You Actually Need for Form 1065 and K-1s

Multi-member LLCs need software that files Form 1065 and issues a K-1 to each member. TurboTax Business, TaxAct and ProConnect all produce the forms — but none of them track partner contributions and distributions during the year, which is usually where the numbers on those forms start to go wrong.

Oct 14, 2026 · 6 min readLLC & Self-Employment TaxesLLC Tax Deadline 2026: Exact Dates by Entity Type (And What Happens If You Miss Them)

Single-member LLCs and LLCs taxed as C-corps file by April 15, 2026. Multi-member LLCs (Form 1065) and LLCs taxed as S-corps file by March 16, 2026. Extensions (Form 7004 or 4868) add six months to file, but any tax owed is still due on the original date — late payment triggers interest and penalties immediately.

Oct 11, 2026 · 6 min readLLC & Self-Employment TaxesLLC Tax Preparation Software: The Real Alternative to Hiring a CPA

LLC tax preparation software like TaxAct Business or H&R Block Premium & Business lets you file Form 1065 or Schedule C yourself for roughly $100-$250 a year instead of the $800-$2,500+ a CPA typically charges. You save money and get speed, but lose audit representation and year-round tax strategy — and the software still needs clean books to work.

Oct 10, 2026 · 7 min read