Calculators
Tax calculators for self-employed workers and LLC owners
Free educational calculators for estimating self-employment tax, 1099 vs W-2 employment taxes, S-Corp payroll taxes, and rough S-Corp tax savings assumptions.
Choose a calculator
S-Corp comparison
S-Corp Tax Savings Calculator
Estimate the rough self-employment and payroll tax difference between sole proprietor or LLC treatment and an S-Corp salary assumption.
Best for: LLC owners, 1099 contractors, and small business owners considering whether S-Corp election may be worth discussing.
- LLC vs S-Corp comparison
- Reasonable salary assumption
- Admin cost break-even
Focused tax estimate
Self-Employment Tax Calculator
Estimate rough self-employment tax for Social Security and Medicare based on net self-employment profit and other W-2 wage assumptions.
Best for: Freelancers, sole proprietors, side-business owners, and 1099 workers who want a focused SE tax estimate.
- SE tax estimate
- Social Security wage base
- Medicare tax breakdown
Sole proprietor projection
Schedule C vs S-Corp Tax Calculator
Run a rough Schedule C to S-Corp tax projection using the same calculator engine with sole proprietor, salary, payroll tax, and admin cost assumptions.
Best for: Sole proprietors, Schedule C businesses, and advisors framing an early S-Corp tax planning discussion.
- Schedule C baseline
- S-Corp projection
- Tax planning discussion
Worker comparison
1099 vs W-2 Tax Calculator
Compare rough 1099 self-employment tax with W-2 employee Social Security and Medicare tax using the same annual compensation assumption.
Best for: Workers comparing tax mechanics across 1099 and W-2 scenarios before discussing classification or compensation.
- 1099 SE tax
- W-2 employee payroll tax
- Contractor expense assumption
Payroll planning
S-Corp Payroll Tax Calculator
Understand how S-Corp shareholder-employee salary payroll taxes affect a broader S-Corp tax savings estimate.
Best for: Business owners testing salary assumptions before using the full S-Corp calculator or speaking with a payroll professional.
- Salary payroll taxes
- Employer payroll cost
- Reasonable salary context
Salary sensitivity
S-Corp Salary vs Distribution Calculator
Model how a shareholder-employee salary assumption changes payroll taxes and remaining profit that may be distributed before admin costs.
Best for: S-Corp owners comparing salary and distribution scenarios without treating a calculator result as a reasonable compensation determination.
- Salary sensitivity
- Payroll tax estimate
- Remaining distribution
Compensation worksheet
S-Corp Reasonable Salary Worksheet
Organize shareholder-employee duties, time, experience, comparable pay, and business facts before discussing reasonable compensation.
Best for: S-Corp owners and advisors who need to prepare a salary-support discussion without relying on a simple salary formula.
- Compensation factors
- Salary support prompts
- Professional review prep
How the tools fit together
The calculators are intentionally narrow. Start with the smallest question: self-employment tax, 1099 vs W-2 employment taxes, or S-Corp payroll taxes. Then use the main S-Corp calculator when you want to compare a rough salary and distribution assumption against default sole proprietor or LLC treatment.
SCorpMath does not determine whether you should elect S-Corp status, how to classify a worker, what salary is reasonable, or how your full federal and state tax return will work. Use the output to prepare better questions for a qualified tax professional.
Calculator FAQ
Are these calculators tax advice?
No. SCorpMath calculators provide rough educational estimates only. They are not tax, legal, accounting, payroll, worker classification, or financial advice.
Which calculator should I start with?
If you already run a self-employed business or LLC, start with the S-Corp Tax Savings Calculator. If you only need self-employment tax, start with the Self-Employment Tax Calculator. If you are comparing 1099 and W-2 scenarios, start with the 1099 vs W-2 Tax Calculator.
Do the calculators store my tax information?
No. The MVP calculators run in your browser and do not store tax inputs. Do not enter sensitive identifiers such as SSN, EIN, tax return files, or account numbers.
Which calculators match common S-Corp planning searches?
The main calculator covers S-Corp tax savings and LLC vs S-Corp tax calculator searches. The Schedule C vs S-Corp calculator covers sole proprietor tax projections. The salary vs distribution calculator shows salary sensitivity and remaining distributions, while the reasonable salary worksheet organizes compensation factors without determining a salary. The self-employment tax and 1099 vs W-2 calculators cover adjacent employment tax comparisons.