How This S-Corp Tax Savings Calculator Works
This calculator estimates one specific thing: the payroll-tax savings you might get by electing S-Corp taxation instead of being taxed as a sole proprietor or single-member LLC. You enter your business net profit before owner salary, a proposed reasonable salary, your filing status, any other W-2 wages, and your expected annual S-Corp costs. It then compares self-employment tax under your current setup against the payroll taxes on an S-Corp salary — and shows your estimated net savings after costs.
It is deliberately focused. It does not calculate your full federal or state income tax return, and it is not tax advice — it is a fast, transparent way to see whether an S-Corp election is worth a conversation with a tax professional.
How S-Corp Tax Savings Work
As a sole proprietor, your entire net profit is subject to self-employment tax — 15.3% (12.4% Social Security up to the annual wage base, plus 2.9% Medicare) on 92.35% of profit. When you elect S-Corp taxation, you split your profit into two parts: a reasonable salary that runs through payroll and is subject to the same Social Security and Medicare taxes, and distributions of the remaining profit that are not subject to those payroll taxes.
That difference is the entire savings mechanism. Take the calculator's default: $120,000 of profit with a $60,000 salary. As a sole proprietor, self-employment tax applies to roughly $110,800 of net earnings. As an S-Corp, payroll tax applies only to the $60,000 salary, and the remaining $60,000 of distributions avoids the 15.3% — producing several thousand dollars of gross payroll-tax savings before costs. The lower your salary relative to profit, the larger the payroll-tax savings — which is exactly why reasonable compensation rules exist.
What Is a Reasonable Salary?
A reasonable salary is what you would have to pay someone else to do the work you personally perform for the business. The IRS requires S-Corp owner-employees to pay themselves reasonable compensation before taking distributions. Critically, the IRS does not use a universal salary-to-profit percentage. Reasonable compensation depends on the services performed, your experience, your responsibilities, the time you devote to the business, and what comparable businesses pay.
The percentage bands in the calculator (below 30%, 30–60%, above 60%) are only an educational planning reference to show how salary affects savings. They are not IRS rules, safe harbors, or guarantees of reasonableness. Document how you arrived at your figure and confirm it with a professional.
Why the Lowest Salary Is Not Automatically Best
It is tempting to minimize salary to maximize distributions and payroll-tax savings. But an unreasonably low salary is one of the most common S-Corp audit triggers. If the IRS reclassifies distributions as wages, you can owe back payroll taxes, penalties, and interest — wiping out the savings and then some.
A low salary also has real trade-offs: it can reduce your Social Security benefit basis, limit retirement plan contributions tied to W-2 wages, and weaken loan or mortgage applications. The goal is a defensible salary that reflects your actual work — not the lowest number a spreadsheet allows.
The Costs of Running an S-Corp
An S-Corp is not free to operate, and those costs come straight out of your savings. Budget for a payroll service to run your salary and file employment tax returns, additional tax preparation for the separate 1120-S corporate return, and bookkeeping or compliance help to keep clean records. Many owners spend somewhere in the low four figures a year combined; the calculator defaults to an editable $1,400 so you can drop in your own quotes.
Some states add their own cost — a franchise tax, an S-Corp fee, or a minimum tax (California, for example, charges a 1.5% tax with an $800 minimum). Enter your state figure in the advanced options so your net savings reflect reality.
When an S-Corp May Not Save Money
An S-Corp election is not always worth it. It tends to underperform when:
- Profit is low, so the payroll-tax savings are too small to cover the added costs — check the estimated break-even profit.
- A reasonable salary would consume most of the profit, leaving little as distributions.
- You already have other W-2 wages near or above the Social Security wage base, which shrinks the Social Security portion of the savings.
- Your state charges high S-Corp fees or franchise taxes.
Use the break-even estimate and the salary what-if tool to pressure-test your own numbers before deciding.