S Corp Tax Calculator
Compare estimated federal payroll taxes and user-entered administrative costs. Results are estimates, not a tax return projection.
A guide by Taxstra Tax & Accounting — CPA-led tax strategy for business owners
How does the S corp tax calculator work?
Use this S corp tax calculator to estimate how electing S corporation taxation could affect your federal payroll taxes. Enter your expected business profit and reasonable compensation to compare an S corporation with a business taxed entirely as self-employment income.
This is an estimate, not a tax return projection. State taxes, payroll costs, retirement contributions, the qualified business income deduction and reasonable-compensation requirements can materially change the result.
- 1. Estimate the baselineModel federal self-employment taxes using the profit and wage inputs.
- 2. Estimate S corp payrollApply payroll-tax assumptions to the entered reasonable compensation.
- 3. Subtract added costsAccount for the payroll, tax-return, setup, and administration costs entered by the user.
Related Guides
When Does an S-Corp Make Sense?
The S-Corp election is a powerful tax strategy, but it's not free. It trades self-employment tax (15.3%) for payroll costs and compliance complexity. To make it worth it, your tax savings must outweigh the costs of running payroll, filing a separate tax return, and paying state franchise taxes. Not sure where to start? Find a tax strategist who can model this for your specific situation.
S-Corp Decision Calculator — on ME Research
Enter your numbers below for a comprehensive analysis.
Financial Inputs
Collected for context; state tax effects are not included.
Tip: Use a salary study (RC Reports) to be defensible.
*Reasonable Compensation should determine your tax strategy, not the other way around. Enter a specific reasonable salary based on your profession (e.g. Physicians often require higher salaries than other service businesses).
Cost Assumptions
Your Reality
A few situations make the S-Corp election unavailable or unwise no matter what the math says.
Enter projected profit and a proposed reasonable salary above to see the breakdown.
Assumptions Used
| Tax year | 2026 |
|---|---|
| Social Security wage base | $184,500 |
| Medicare rates | 2.9% self-employment; 1.45% employee and 1.45% employer |
| Additional Medicare treatment | 0.9% above the threshold for the selected filing status, after outside W-2 income |
| Salary and distributions | Salary is subject to payroll-tax assumptions; the remaining business profit is shown as an estimated distribution after payroll taxes and entered annual costs |
| Federal income tax and QBI | Not included |
| State tax | Not included; state is collected for discussion context only |
| Visitor-entered costs | Payroll service: $2,500; additional accounting/tax preparation: $1,500; setup cost is shown separately |
How the S Corp Tax Calculator Works
The calculator compares estimated self-employment taxes on net earnings with estimated employee and employer payroll taxes on the proposed salary. It then subtracts the annual payroll and accounting costs entered by the visitor. It does not decide whether the salary is reasonable or whether an election is available.
S Corp Tax Calculator Example
Enter a clearly hypothetical business profit and salary above. The result panel shows each line used in the comparison:
- Estimated self-employment tax without S-corp treatment
- Estimated employee and employer payroll taxes on salary
- Gross payroll-tax difference
- Visitor-entered annual administrative costs
- Estimated net annual difference and break-even profit
When an S Corp May Save You Money
A favorable estimate is more likely when business profit materially exceeds supportable reasonable compensation and the payroll-tax difference is larger than added payroll, accounting, state, and administrative costs.
When an S Corp May Not Make Sense
Low or inconsistent profit, a salary close to total profit, outside W-2 wages, ownership restrictions, financing plans, state-level costs, and administrative burden can reduce or eliminate the estimated benefit.
Reasonable Compensation Changes the Calculation
Reasonable compensation is a facts-and-circumstances analysis, not a fixed percentage. Use a defensible salary based on duties, time, experience, and comparable compensation before relying on the estimate.
Costs That Can Reduce Your S Corp Savings
Payroll service, tax preparation, bookkeeping, state filings and taxes, entity maintenance, insurance, and owner time can all affect the net result. Enter known annual payroll and accounting costs above and review the rest separately.
S Corp Tax Calculator FAQs
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