S-Corp Tax Calculator
Estimate how much electing S-corporation status could save you in 2025 payroll taxes compared with staying a sole proprietor — after the extra admin costs of running one.
Reviewed by the CalcCafe editorial team · Last updated 18 July 2026 · How we test our tools
Example
A consultant’s business nets $150,000 before paying herself anything. As a sole proprietor, self-employment tax applies to 92.35% of that profit ($138,525): 12.4% Social Security plus 2.9% Medicare comes to $21,194. As an S-corp paying herself a reasonable salary of $70,000, Social Security and Medicare are due only on the salary — both the employer and employee halves, 15.3% in total — or $10,710. That is a payroll-tax saving of $10,484; after about $1,500 of extra payroll-service and filing costs, the estimated net saving is $8,984 a year. Federal income tax is the same either way.
How it works
Sole-proprietor side: self-employment tax is charged on 92.35% of net profit — 12.4% Social Security on that base up to the 2025 wage cap of $176,100, plus 2.9% Medicare on all of it. S-corp side: Social Security and Medicare become ordinary payroll taxes on your salary only — 6.2% + 1.45% withheld from your pay and matched by the company (7.65% each side, 15.3% combined), with the same $176,100 Social Security cap. The salary is capped at your net profit, since you cannot pay yourself more than the business makes. Savings = sole-proprietor SE tax − S-corp payroll tax − the extra annual cost of running the S-corp. This is a 2025-tax-year, federal-only, simplified educational model: it ignores state taxes, the 0.9% additional Medicare surtax, unemployment taxes and the QBI interaction described below.
Good to know
The whole strategy hinges on reasonable compensation. The IRS requires S-corp owner-employees who work in the business to take a salary comparable to what they would earn doing the same job for someone else — and it scrutinizes returns where a profitable S-corp pays a token salary (or none) while distributing large profits. If your salary is recharacterized on audit, you owe back payroll taxes, penalties and interest. Look at market pay for your role, hours and region, document how you set the number, and resist the temptation to slide it to the minimum just to maximize this calculator’s output.
Be clear about what an S-corp does not save: federal income tax. An S-corp is a pass-through, so profits still land on your personal return and are taxed at the same rates whether they arrive as salary or as distributions. The entire saving is the payroll-tax gap — Social Security and Medicare apply to your salary but not to distributions, whereas a sole proprietor pays self-employment tax on essentially the whole profit. There is also a quiet offset: the 20% QBI deduction is computed on business income after your salary, so a higher salary shrinks the QBI deduction and claws back part of the headline saving.
Running an S-corp costs real money and admin time: a payroll service to run wages and file Forms 941 and W-2, a separate corporate return (Form 1120-S) that most owners pay a preparer for, state registration and franchise or minimum fees in many states, plus bookkeeping discipline — a business bank account, no commingling, and properly documented distributions. The $1,500 default in this tool is typical for a solo owner on a budget payroll provider; many owners spend $2,000–$3,500 once state fees and CPA time are counted, so adjust the field to your quotes.
When is it worth it? A common rule of thumb: once net profit clears roughly $80,000–$100,000, the payroll-tax saving comfortably beats the added cost and hassle, because a meaningful gap opens between profit and a defensible salary. Below that, the gap narrows — a $50,000-profit business usually has to pay most of that as salary anyway, leaving little to save. Timing matters too: the election (Form 2553) is generally due within 2 months and 15 days of the start of the tax year you want it to cover. And remember that a lower salary also means lower Social Security wage credits and less solo-401(k) contribution room — model the whole picture with a CPA, not just the payroll-tax line.
Frequently asked questions
Does an S-corp reduce my federal income tax?
No. An S-corp is a pass-through entity, so all profit is still taxed on your personal return at ordinary rates. The saving is payroll tax only: Social Security and Medicare apply to your salary but not to profit distributions, while a sole proprietor pays 15.3% self-employment tax on essentially all net profit.
What counts as a reasonable salary for an S-corp owner?
Roughly what you would have to pay someone else to do your job — considering your duties, hours, experience and local market rates. The IRS looks at comparable wage data, your training, and how much of the revenue your personal work generates. A profitable S-corp paying its working owner little or no salary is a classic audit flag.
At what income does an S-corp election become worth it?
A common rule of thumb is net profit above roughly $80,000 to $100,000. Below that, a defensible salary eats most of the profit, so there is little left to take as payroll-tax-free distributions, and the extra costs — payroll service, Form 1120-S preparation, state fees — can wipe out the saving.
Is this calculator free, and is my data uploaded anywhere?
Yes, it is completely free with no sign-up, and no — it runs entirely in your browser. The profit, salary and cost figures you enter never leave your device.
People also ask
How do I elect S-corp status?
File Form 2553 with the IRS, signed by all shareholders — an LLC can elect S-corp taxation without changing its legal form. The election is generally due within 2 months and 15 days of the start of the tax year it should take effect, though late-election relief is often available. You then run real payroll and file Form 1120-S each year.
Does an S-corp owner still pay quarterly estimated taxes?
Usually yes. Income tax on your share of S-corp profit is not withheld anywhere, so most owners either pay quarterly estimates on the pass-through profit or increase withholding on their own salary to cover it. The payroll taxes on your wages are handled automatically through the payroll system.
How does an S-corp affect the QBI deduction?
Your salary is not qualified business income, so paying yourself more shrinks the 20% QBI deduction on the remaining profit. This claws back part of the payroll-tax saving — though at higher incomes W-2 wages can also help you keep the deduction, so the interaction cuts both ways and is worth modeling with a professional.
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Sources & references
These tools follow our methodology and provide educational estimates only — verify important figures with a qualified professional.