Calculator Inputs
Example Data Table
| Scenario | Filing Status | Earned Income | Other Income | Contributions | Deductions Used | Credits | State Rate |
|---|---|---|---|---|---|---|---|
| Case A | Single | $85,000 | $3,000 | $6,000 | $13,850 | $1,200 | 5.00% |
| Case B | Married Filing Jointly | $140,000 | $5,500 | $12,000 | $27,700 | $2,000 | 4.25% |
| Case C | Head of Household | $72,000 | $2,500 | $4,500 | $20,800 | $1,500 | 3.80% |
Formula Used
Gross Income = Annual Earned Income + Other Taxable Income
Ordinary Taxable Income = Gross Income − Pre-Tax Contributions − Chosen Deduction
Apply each progressive band rate only to income inside that band.
Ordinary Tax After Credits = max(0, Ordinary Tax Before Credits − Tax Credits)
Capital Gains Tax = Capital Gains Income × Capital Gains Rate
State and Local Tax = (Ordinary Taxable Income + Capital Gains Income) × State Rate
Social Contribution Tax = Annual Earned Income × Social Contribution Rate
Total Estimated Tax = Ordinary Tax After Credits + Capital Gains Tax + State and Local Tax + Social Contribution Tax
This calculator is designed for planning. It uses built-in progressive bands plus your custom rates. Adjust deductions, credits, and percentages to match your situation.
How to Use This Calculator
- Choose your filing status.
- Enter earned income and other taxable income.
- Add pre-tax contributions that reduce taxable income.
- Select standard deduction or use itemized deductions.
- Enter credits that directly reduce ordinary tax.
- Add capital gains and its estimated rate.
- Enter local tax and social contribution rates.
- Press Calculate Tax to view totals, breakdowns, and graph.
FAQs
1. What does this calculator estimate?
It estimates total annual tax using income, deductions, credits, capital gains, state or local tax, and payroll-style contributions.
2. Is this calculator suitable for exact filing?
No. It is best for planning and quick comparisons. Actual tax rules vary by location, year, income type, and personal circumstances.
3. What is the difference between marginal and effective rate?
Marginal rate is the rate on your last taxable dollar. Effective rate is total estimated tax divided by your total included income.
4. Why do credits reduce tax differently than deductions?
Deductions lower taxable income first. Credits reduce the tax amount after the ordinary band calculation.
5. Can I compare standard and itemized deductions?
Yes. Switch between the deduction options and recalculate. The result section updates instantly after form submission.
6. Does it include local tax and payroll-style deductions?
Yes. Enter your own state or local rate and social contribution rate to include those amounts in the final estimate.
7. Why is capital gains entered separately?
Capital gains often use different rates than ordinary income. This calculator keeps them separate for clearer planning.
8. Can I export the results?
Yes. Use the CSV or PDF buttons after calculation. Both export the current result breakdown table.