Electing S-corp tax status is one of the most talked-about "tax hacks" for profitable freelancers and small business owners — and it can be a real one, but only past a certain income level, and only if you pay yourself a defensible salary. This calculator estimates the actual dollar savings by comparing the self-employment tax you'd owe as a sole proprietor against the payroll tax on an S-corp salary, minus the extra administrative cost the S-corp structure adds. It won't tell you whether to make the switch — it will tell you whether the math is even close.
How it works
As a sole proprietor, every dollar of net profit is subject to 15.3% self-employment tax (Social Security and Medicare, combined) once it's reduced to 92.35% of net profit under IRS Schedule SE rules. The calculator runs your net profit through that same formula to get your sole-prop self-employment tax.
As an S-corp, you split your income into two pieces: a "reasonable salary" paid to yourself as a W-2 employee, and the remaining profit paid out as a distribution. Only the salary is subject to payroll tax — split as 7.65% employee-side and 7.65% employer-side, the same combined 15.3% rate as self-employment tax — while the distribution portion escapes Social Security and Medicare tax entirely. That's the entire source of S-corp tax savings: whatever profit doesn't have to be salary. The calculator applies the 15.3% rate to the reasonable salary you enter to get the S-corp payroll tax.
Subtracting the S-corp payroll tax and your added admin cost (extra payroll processing and accounting fees) from the sole-prop self-employment tax gives the estimated annual savings — the bottom-line number this tool is built around.
Worked example
Say your net profit is $120,000, you'd pay yourself a $60,000 reasonable salary as an S-corp, and the added payroll and accounting cost of running an S-corp is $2,000 a year.
- Sole-prop self-employment tax on $120,000: $16,955.46
- S-corp payroll tax on the $60,000 salary: $60,000 × 15.3% = $9,180.00
- Estimated annual savings: $16,955.46 − $9,180.00 − $2,000 = $5,775.46
Now compare that to a smaller business: $40,000 net profit, a $35,000 reasonable salary (most of the profit has to be salary at this income level), and $1,500 in added admin cost.
- Sole-prop self-employment tax on $40,000: $5,651.82
- S-corp payroll tax on the $35,000 salary: $35,000 × 15.3% = $5,355.00
- Estimated annual savings: $5,651.82 − $5,355.00 − $1,500 = −$1,203.18
That negative number is the point: below a certain income, there isn't enough profit left over after a defensible salary to make the payroll-tax exemption on distributions worth the added cost of running an S-corp at all.
How to interpret your result
A positive savings figure means the payroll tax you avoid on the distribution portion of your income outweighs what the S-corp structure costs you in extra admin. A negative figure means the S-corp election would cost you money this year — usually because net profit is too close to (or below) what a reasonable salary would already need to be, leaving little or nothing to shelter as a distribution.
The number this tool can't check for you is whether your "reasonable salary" input would survive IRS scrutiny. The IRS requires S-corp owner-employees to be paid compensation reasonable for the work performed, based on factors like training, experience, and time devoted to the business, before any profit goes out as a lower-taxed distribution — paying yourself an artificially low salary to inflate the "savings" here is exactly the pattern the IRS looks for and can reclassify as wages after the fact. Treat the salary figure as a real number to check with a CPA, not a knob to tune for a better result.
This tool also does not model the Qualified Business Income deduction, state-level S-corp taxes or franchise fees, the cost of filing a separate corporate return, or your own time spent on the added bookkeeping — and it applies the full 15.3% FICA rate to your entered salary without capping the Social Security portion at the annual wage base, which slightly understates savings for very high salaries. Treat the output as a first-pass estimate, not a complete cost-benefit analysis or a substitute for advice from a CPA.
Methodology & sources
Sole-prop self-employment tax follows IRS Schedule SE mechanics: net profit × 92.35% is the taxable base, taxed at 12.4% for Social Security (capped at the annual wage base) plus 2.9% for Medicare (uncapped), summed and rounded to the cent — the same formula used by this site's Self-Employment Tax Calculator. S-corp payroll tax is calculated as 15.3% of the reasonable salary entered, representing the combined employee and employer FICA share on W-2 wages. Estimated annual savings is the sole-prop self-employment tax minus the S-corp payroll tax minus added admin cost, rounded to the cent.
See the IRS's S Corporation Compensation and Medical Insurance Issues page for the reasonable-compensation requirement this calculator assumes you'll meet, and the Self-Employment Tax (Social Security and Medicare Taxes) page for the sole-prop side of the comparison. This tool covers US federal tax rules for the 2026 tax year only — not state taxes, not the QBI deduction, not corporate filing costs, and not personalized tax or legal advice.