LLC vs. S-Corp Taxes: Reasonable Salary, Savings & How to Convert

If you've crossed the $50,000-profit mark with your LLC, you've probably heard someone, a CPA, a podcast, a friend with strong opinions, tell you to "elect S-Corp" to save on taxes. The advice isn't wrong. But it's incomplete. Done right, the S-Corp election can save a single-owner business $4,000–$10,000 per year. Done wrong, it can cost more than it saves, draw IRS scrutiny, or both.

This guide covers exactly how the math works, the rules around "reasonable salary," when the election makes sense, and how to actually file the conversion.

An S-Corp Isn't a Different Kind of Business

The first thing to clear up: "S-Corp" is a federal tax classification, not a legal entity type. You don't dissolve your LLC to "become" an S-Corp. You keep your LLC, and you file IRS Form 2553 to elect S-Corp tax treatment.

Your LLC keeps its name, its EIN, its bank account, and its operating agreement. The state of Wisconsin still treats it as an LLC. The only thing that changes is how the IRS taxes the profit. And that's where the savings come from.

How an LLC Is Taxed by Default

By default, the IRS treats LLCs as "disregarded entities" (single-member) or partnerships (multi-member). In plain English: all profit flows straight to your personal tax return, and you owe two kinds of tax on it.

1. Income tax: at your marginal federal and state rates. This is unavoidable on any structure.
2. Self-employment (SE) tax: 15.3% on your net business income (12.4% Social Security + 2.9% Medicare). This is the part the S-Corp election attacks.

SE tax applies to all your net profit, up to the Social Security wage base (which adjusts annually). Medicare's 2.9% has no cap, and an additional 0.9% Medicare surtax kicks in above $200,000 single / $250,000 married filing jointly.

So if your LLC nets $100,000 in profit, you owe roughly $14,130 in SE tax alone (15.3% × 92.35% × $100,000), plus federal and state income tax on that same $100,000. That SE tax is what S-Corp election can reduce.

How S-Corp Taxation Actually Works

When your LLC is taxed as an S-Corp, the IRS splits your profit into two pieces:

• A reasonable salary (W-2 wages): you put yourself on payroll, and these wages are subject to payroll taxes (the same 15.3% as SE tax, just split into employer and employee halves).
• Distributions: whatever's left after salary. Distributions are not subject to SE or payroll tax. They're still hit with ordinary income tax, but the 15.3% layer is gone.

That's the whole game. Whatever portion of profit you can legitimately move from "salary" to "distribution" saves you 15.3% on that portion.

The Reasonable Salary Requirement

Here's the catch. And it's the part most people gloss over. The IRS doesn't let you pay yourself $1 in salary and take $200,000 in distributions. The rule is that S-Corp owner-employees must take reasonable compensation for the services they actually perform.

"Reasonable" means: what would someone with your skills, doing your work, in your industry and geography, earn as a W-2 employee? The IRS looks at factors including:

• Your training, experience, and credentials
• The duties and responsibilities of your role
• The time and effort you devote to the business
• What comparable businesses pay for similar work
• Your role in generating revenue

There's no fixed formula, but here are the practical benchmarks most CPAs use:

If the IRS audits and decides your salary was too low, they can reclassify your distributions as wages. Meaning back payroll taxes, interest, and penalties. This is the single biggest risk of the S-Corp election, and it's why "pay yourself $20K and take $180K in distributions" is a fast track to trouble.

The Math: When the S-Corp Election Saves Money

Let's run actual numbers at three profit levels. Each scenario uses a 50% reasonable salary as a starting point. Your number may differ.

*At higher incomes, the Social Security wage base cap reduces the SE-tax base, so savings flatten relative to gross profit. Numbers rounded; assumes service business with no qualified retirement plan and a reasonable salary equal to 50% of profit.

Two patterns to notice:

• Below ~$50K profit, savings are thin or negative after costs. Don't bother.
• Between $80K and $200K, the election is usually a clear win: typically $4K–$6K in net annual savings.

The Hidden Costs You Have to Subtract

The "savings" number isn't the savings. You have to subtract the cost of running an S-Corp, which is real:

• Payroll service: Gusto, ADP, QuickBooks Payroll, etc. Roughly $30–$60/month, or $360–$720/year.
• Additional tax prep: S-Corps file Form 1120-S separately from your personal return. Most CPAs charge $500–$1,500 more for an S-Corp return than a Schedule C.
• State unemployment insurance (SUI): Once you're on payroll, your wages are subject to SUI. In Wisconsin this is typically a few hundred dollars a year on a moderate salary.
• Workers' comp (sometimes): Depending on state and structure. Wisconsin generally exempts sole owner-employees of corporations from mandatory workers' comp, but it varies.
• More bookkeeping rigor: You can no longer treat the business account as a personal piggy bank. Distributions need to be documented, salary needs to be on a regular schedule.

Add it up: realistically $1,500–$2,500/year in added costs for a single-owner S-Corp. That's why the break-even point is around $40K–$50K of profit.

Other Tradeoffs to Weigh

Besides cost, a few less-discussed tradeoffs:

• QBI deduction interaction: The Section 199A Qualified Business Income deduction (20% of business income, with limits) applies to your S-Corp distribution, not your salary. Higher salary = lower QBI deduction. This nuance is part of why "minimize salary" can backfire even before audit risk.
• Social Security benefits: Lower lifetime W-2 wages mean a slightly lower Social Security benefit when you retire. For most people this is negligible, but it's not zero.
• Retirement plan contributions: Solo 401(k) employer contributions are based on W-2 wages for S-Corp owners (not net SE income like a sole prop). At low salaries, your max contribution drops.
• Reasonable comp scrutiny: The IRS is increasingly using data analytics to flag S-Corps with suspiciously low owner salaries. This isn't 1995. They have your data.

When You Should NOT Elect S-Corp

The S-Corp election is the wrong move if any of these apply:

• Profit is under ~$50,000. The added costs eat the savings.
• Your business has many investors or non-individual owners. S-Corps cap at 100 shareholders and disallow most non-individual owners (corporations, partnerships, most trusts, non-resident aliens).
• You want to reinvest most profit and pay yourself little. The reasonable-salary rule still requires a market-rate salary even if it leaves nothing for distribution.
• You plan to raise venture capital. VCs almost always require C-Corps. S-Corp is a dead-end for that path.
• You have multiple classes of stock or planned profit-sharing arrangements. S-Corps allow only one class of stock.

How to Convert: Filing Form 2553

If the math says it's worth it, here's the actual process:

1. Make sure you're eligible. Domestic LLC, all members are individuals (or certain trusts/estates), no non-resident aliens, and you'll have only one class of economic interest.
2. File IRS Form 2553 (Election by a Small Business Corporation). Every member/owner signs. You can fax or mail it; e-filing is not currently supported for Form 2553.
3. Watch the deadline. To take effect for the current tax year, the form must be filed within 2 months and 15 days of the start of the tax year (so March 15 for calendar-year taxpayers). Miss the window and the election applies to the following year. Unless you qualify for late-election relief under Rev. Proc. 2013-30.
4. Set up payroll the same month the election is effective. You'll need to file Form W-4, register for state withholding and unemployment, and start running paychecks for yourself on a regular schedule.
5. File Form 1120-S annually for the S-Corp itself, plus a Schedule K-1 for each owner. The K-1 flows to your personal Form 1040.

Timing the Conversion

Two timing patterns most owners follow:

• Mid-year decision. If you cross the profitability threshold partway through a year, file Form 2553 by March 15 of the following year. The election starts January 1 of that next year, and you run S-Corp payroll cleanly from day one.
• Year-one election for new businesses. If you're forming an LLC and you already know revenue will exceed $80K+ in year one (e.g., you're leaving a job to consult full-time at a known rate), file Form 2553 within 75 days of formation to elect S-Corp from inception.

What you don't want: making the election retroactively to "save taxes on profit you've already taken as draws." Distributions taken before the election are still pass-through profit subject to SE tax. The election doesn't rewrite history.

Practical Checklist Before You Pull the Trigger

1. Project your net profit for the year (not revenue. Profit after all expenses).
2. Research your role's median market salary using BLS, Glassdoor, or Salary.com.
3. Run the math: SE tax under default vs. payroll tax on salary under S-Corp, minus realistic operating costs.
4. If net savings exceed roughly $3,000/year, talk to a CPA about whether the election fits your situation.
5. If you proceed: file Form 2553, set up payroll, document your reasonable-salary research, and keep that documentation in case of audit.

Frequently Asked Questions