Choosing between an LLC and an S corporation is one of the highest-impact tax decisions a US small business owner makes. Both structures offer liability protection and pass-through taxation, but they treat your earnings very differently once profits grow. Here is how LLC and S corp taxation actually work, when the S corp election saves real money, and when it just adds paperwork.

LLC Taxation: Simple but Costly at Scale

By default, a single-member LLC is taxed as a sole proprietorship and a multi-member LLC as a partnership. All net profit flows to your personal tax return, and you pay income tax plus self-employment tax of 15.3 percent on the entire profit, covering Social Security and Medicare. The LLC itself pays no separate tax. This simplicity is great when profits are modest, but as earnings grow, paying 15.3 percent self-employment tax on every dollar becomes painful. An LLC with $150,000 in profit pays roughly $23,000 in self-employment tax alone.

S Corp Taxation: The Salary-and-Distribution Split

An S corporation is also a pass-through entity, but with a crucial difference: owner-employees must pay themselves a reasonable salary, which is subject to payroll taxes, while remaining profits can be taken as distributions that are not subject to Social Security and Medicare taxes. Using the same $150,000 example, an S corp owner paying herself a reasonable $80,000 salary would owe payroll taxes mainly on the $80,000, potentially saving around $10,000 compared with the LLC’s tax on the full $150,000. The savings grow with profit, which is why the S corp election becomes attractive once earnings pass roughly $60,000 to $80,000.

Side-by-Side Comparison

• Self-employment and payroll tax: LLC pays 15.3 percent on all profit; S corp pays it only on the owner’s salary, not on distributions.
• Income tax: both are pass-through, so profits are taxed once at the owner’s personal rates.
• Reasonable salary rule: S corp owners must pay themselves market-rate salaries; the IRS watches this closely and reclassifies distributions if salaries are suspiciously low.
• Paperwork: LLCs have minimal formalities; S corps require payroll, corporate minutes, stricter bookkeeping, and usually an accountant.
• Ownership limits: S corps are limited to 100 US-based individual shareholders and one class of stock; LLCs have no such restrictions.
• Costs: running an S corp typically adds $1,000 to $3,000 a year in payroll services and accounting fees.

When the S Corp Election Saves Money

The S corp election, which any eligible LLC can make by filing IRS Form 2553, typically pays off once net profit consistently exceeds about $60,000 to $80,000 a year. At that level, the payroll tax savings outweigh the extra compliance costs. High-profit service businesses, consultants, agencies, and freelancers see the biggest benefit, because their profits are high relative to the reasonable salary the business requires. The more profit above a defensible salary, the larger the savings.

When an LLC Is the Better Choice

• Profits under $50,000 to $60,000: the tax savings are too small to justify payroll and accounting costs.
• Uneven or unpredictable income: the reasonable-salary requirement is awkward when profits swing wildly year to year.
• Real estate investors: S corps are generally a poor vehicle for holding property because of tax treatment on sale and distributions.
• Foreign owners or complex ownership: S corp eligibility rules exclude non-resident aliens and certain entity owners.
• Simplicity matters most: if you want minimal paperwork and cost, the plain LLC wins.

How to Make the Switch

You do not have to choose at formation. Start as an LLC for simplicity, then elect S corp taxation when profits justify it by filing Form 2553 with the IRS, ideally early in the tax year for it to apply to the full year. Set up payroll before taking distributions, document a reasonable salary with comparable market data, and keep clean books separating salary from distributions. Most owners making this switch hire an accountant for the first year to get the salary figure and filings right.

Conclusion

For most profitable small businesses, the S corp election saves more on taxes once profits pass roughly $60,000 to $80,000, thanks to reduced Social Security and Medicare taxes on distributions. Below that threshold, the LLC’s simplicity and lower costs usually win. The smartest path for many owners is to start as an LLC and elect S corp status when the numbers justify it, with guidance from a tax professional who knows your state’s rules.

Disclaimer: this article is general information, not tax advice. Tax rules change and vary by state, so consult a qualified tax professional about your situation.