Payroll tax calculator
S-Corp Payroll Tax Calculator
Estimate how S-Corp salary payroll taxes affect a rough LLC vs S-Corp tax savings comparison.
Short answer
S-Corp payroll is one of the main moving parts in an S-Corp tax savings estimate. In a simplified comparison, salary paid to a shareholder-employee is generally subject to Social Security and Medicare payroll taxes, while remaining profit may be distributed differently.
SCorpMath does not run payroll or calculate full payroll compliance. It estimates how salary payroll taxes affect the rough comparison between default sole proprietor or LLC treatment and S-Corp treatment.
What S-Corp payroll means in a tax estimate
For calculator purposes, S-Corp payroll usually means modeling wages paid to a shareholder-employee and estimating the Social Security and Medicare taxes connected to those wages. That is different from a default sole proprietor or disregarded LLC estimate, where net earnings are commonly the starting point for self-employment tax.
This page focuses on the federal payroll tax mechanics inside the estimate. A real payroll setup can involve withholding, deposits, payroll tax returns, state unemployment accounts, local rules, payroll software, and professional review.
Do S-Corp owners need payroll?
A shareholder-employee who provides services to an S-Corp generally needs to think about wages, payroll taxes, and reasonable compensation before relying on distributions. SCorpMath cannot decide when payroll is required for a specific business or how a payroll system should be configured.
Use the calculator to understand the rough cost of a salary assumption, then review payroll timing, filings, state registrations, and salary support with a qualified tax or payroll professional.
Example payroll tax estimate
This example uses 2026 assumptions, $120,000 of net business profit, a $70,000 S-Corp salary, $3,000 of admin costs, single filing status, and no other W-2 wages. It is an example only, not a recommendation.
Example S-Corp salary
$70,000
Estimated employee payroll tax
$5,355
Estimated employer payroll tax
$5,355
Estimated total payroll tax
$10,710
To adjust salary, profit, admin costs, filing status, or other W-2 wages, use the main S-Corp tax savings calculator.
What S-Corp payroll tax usually includes
In a simplified federal estimate, payroll taxes on S-Corp salary commonly include the Social Security portion and the Medicare portion. The calculator can also include the employer side as an economic cost of S-Corp treatment.
- Employee Social Security tax on wages up to the annual wage base.
- Employer Social Security tax on wages up to the annual wage base.
- Employee Medicare tax.
- Employer Medicare tax.
- Additional Medicare Tax threshold logic for higher wage assumptions.
How S-Corp payroll works in a calculator estimate
A payroll tax calculator is only one part of an S-Corp comparison. The salary assumption drives payroll taxes, the remaining profit drives the distribution assumption, and admin costs can change the break-even point.
Step 1
Choose a salary assumption
Start with a salary that can be discussed in light of duties, time, experience, training, and comparable compensation.
Step 2
Estimate employee and employer FICA
Model Social Security and Medicare taxes on that salary, including the employer side as an economic cost when appropriate.
Step 3
Add payroll and compliance costs
Payroll software, bookkeeping, tax filings, state accounts, and unemployment rules can change whether the structure is worth discussing.
Step 4
Compare against Schedule C or LLC treatment
Use the payroll estimate inside a broader Schedule C vs S-Corp projection rather than reading it as a standalone savings answer.
What this payroll estimate does not include
A real payroll setup may involve more than Social Security and Medicare payroll taxes. SCorpMath does not estimate every payroll compliance item.
- Federal unemployment tax.
- State unemployment or disability insurance.
- Payroll provider subscription fees.
- Workers compensation insurance.
- Payroll deposit schedules or filing penalties.
- State or local payroll rules.
S-Corp payroll requirements this calculator does not cover
S-Corp payroll requirements can vary by federal, state, and local facts. This calculator does not determine whether a business has opened the right payroll accounts, followed deposit schedules, filed the right forms, or met state unemployment and workers compensation rules.
Those compliance costs belong in the admin cost assumption when they are relevant to the planning estimate.
S-Corp owner payroll planning checklist
Use this checklist before treating an S-Corp payroll tax estimate as a planning input. It is not a payroll setup guide, but it can help organize the questions a CPA, EA, payroll provider, or attorney may need to review.
- Document the shareholder-employee role, duties, time, and comparable pay support.
- Choose a salary assumption for the estimate without treating it as a safe-harbor salary.
- Estimate employee and employer Social Security and Medicare taxes on that salary.
- Account for payroll software, payroll provider, bookkeeping, and business return preparation costs.
- Ask about federal payroll forms, deposits, FUTA, state unemployment, workers compensation, and local payroll rules.
- Review timing before relying on a current-year S-Corp election or payroll start date.
Why reasonable salary still matters
The payroll tax estimate depends heavily on the salary assumption. A lower salary can reduce estimated payroll taxes, but that does not mean the salary is reasonable. SCorpMath does not determine reasonable compensation or provide a safe salary amount.
Read the reasonable salary guide before relying on any salary-based estimate.
Related S-Corp payroll planning pages
Payroll tax calculator FAQ
What payroll taxes does this S-Corp payroll tax calculator estimate?
SCorpMath estimates Social Security and Medicare payroll taxes on the S-Corp salary assumption, including employer payroll taxes when that option is included.
Does SCorpMath calculate full payroll compliance?
No. It does not calculate payroll deposits, withholding forms, FUTA, state unemployment, workers compensation, payroll provider fees, or every state payroll rule.
Do S-Corp owners need payroll?
A shareholder-employee who provides services to an S-Corp generally has a wage and payroll question. Whether payroll is required, when it starts, and how it should be run depends on the facts and should be reviewed with a qualified tax or payroll professional.
How do you plan S-Corp owner payroll for an estimate?
Start by separating the salary assumption from distributions, then consider employer and employee payroll taxes, payroll software or provider costs, federal and state payroll accounts, filing deadlines, and reasonable compensation support.
Why does S-Corp salary matter for payroll tax?
A shareholder-employee salary is generally subject to payroll taxes. Remaining profit may be distributed differently, but salary must be reasonable based on the facts.
Is S-Corp payroll tax the same as self-employment tax?
No. A default sole proprietor or disregarded LLC estimate commonly starts with self-employment tax on net earnings. An S-Corp comparison estimates payroll taxes on shareholder-employee salary instead. The full answer depends on salary support, distributions, admin costs, and state rules.
Does this calculator run payroll?
No. SCorpMath does not run payroll, file payroll forms, make deposits, or choose a payroll provider. It only estimates how salary payroll taxes affect a rough S-Corp comparison.
Should payroll costs be included in the admin cost assumption?
Usually yes for a planning estimate. Payroll software, bookkeeping, business tax preparation, state accounts, and professional fees can change whether an S-Corp scenario is worth discussing.