Choosing between a limited liability company (LLC) taxed as a sole proprietorship and an S corporation is a common decision point for small‑business owners. While many focus solely on the potential reduction in self‑employment tax, a recent report from 1‑800Accountant adds the full cost picture to the discussion.

How the tax comparison is built

The study uses proprietary data from 6,908 small‑business clients to estimate federal tax liability for both structures across revenue ranges. It standardizes the comparison by using a common income basis, because an S corporation’s net income is calculated after deducting owner‑employee wages, whereas a sole proprietor’s net income includes the entire profit.

For S corporations, the model assumes a “reasonable” salary equal to 40 % of profit and the remaining 60 % taken as distributions, which are not subject to payroll tax. The Schedule C (sole‑proprietor) scenario applies self‑employment tax to the full net profit.

Federal tax savings are modest until higher profits

Across all profitable revenue brackets, the S corporation scenario shows a lower federal tax bill. The gap is small at lower profit levels—about $470 in the $50,000‑$100,000 revenue range—and grows to roughly $1,500 when net income reaches $22,543. The difference becomes more meaningful once net income exceeds about $100,000.

Recurring costs of operating an S corporation

Beyond the tax calculation, the report highlights several ongoing expenses that can erode the savings:

• Additional tax return: Filing Form 1120‑S and issuing Schedule K‑1 typically costs $1,000 or more, compared with about $500 for a Schedule C.
• Payroll processing: Running payroll for a reasonable salary requires quarterly filings, W‑2 preparation and a payroll service that can range from $20 to $200 per month plus per‑employee fees. For a single owner‑employee, annual costs can reach $500‑$1,000.
• Compliance risk: The IRS requires a defensible salary. Misclassifying distributions as wages can trigger re‑classification, additional payroll tax, penalties and interest.
• State‑level taxes: Some states levy entity‑level taxes on S corporations. California, for example, charges the greater of $800 or 1.5 % of net income each year, while a default LLC only owes the $800 minimum franchise tax.

Formation costs are similar

Initial filing fees for creating an LLC or a corporation are comparable, averaging around $130 and ranging from $35 to $500 depending on the state. These one‑time costs do not influence the long‑term financial comparison.

When might an S corporation make sense?

Only about 21 % of S‑corp clients with revenue under $50,000 were profitable, and the estimated salary in that bracket ($3,800) is low enough to attract IRS scrutiny. The analysis suggests that owners should remain a default LLC until profits are steady enough to support a genuine salary and cover the added overhead.

Business owners should also verify their specific state’s S‑corp filing requirements, as rules and fees vary widely.

Bottom line

Federal tax savings from electing S corporation status become significant only after a business consistently earns a healthy profit. When the recurring costs of a second tax return, payroll services, compliance documentation and possible state taxes are added, the advantage can disappear for smaller operations. Small‑business owners are encouraged to consult a qualified tax professional to model the full financial impact before making a structural change.

Original reporting: KTVZ (Central Oregon) — read the source article.