Documentation.
DOC-01
Getting Started.
| Create an account | Sign up at /register with your full name, email, and a password. No credit card required. |
| Log in | Visit /login and enter your credentials. Authentication uses HTTP-only cookies for security. |
| Access your dashboard | After login you are redirected to /dashboard where you can calculate taxes immediately. |
DOC-02
Tax Calculation.
| Select filing status | Choose from Single, Married Filing Jointly, Married Filing Separately, or Head of Household. |
| Enter gross income | Input your total annual gross income before any deductions. |
| Click Calculate Taxes | Results appear instantly below the form including total tax, effective rate, and bracket breakdown. |
DOC-03
Understanding Results.
| Total Federal Tax | The total amount of federal income tax owed based on your taxable income. |
| Effective Rate | Your total tax divided by gross income — the average rate you pay across all income. |
| Marginal Rate | The tax rate applied to your last dollar of income — the highest bracket you fall into. |
| Bracket Breakdown | A visual breakdown showing how much of your income falls into each tax bracket and the tax owed per bracket. |
DOC-04
Downloading Reports.
| Calculate first | A report can only be generated after running a tax calculation. |
| Click Download Report | Find the button in the Estimated Summary card after calculating. |
| Report contents | The pdf report includes your name, email, income details, tax summary, and full bracket breakdown. |
DOC-05
2025 Tax Brackets (Single).
| 10% | $0 – $11,925 |
| 12% | $11,926 – $48,475 |
| 22% | $48,476 – $103,350 |
| 24% | $103,351 – $197,300 |
| 32% | $197,301 – $250,525 |
| 35% | $250,526 – $626,350 |
| 37% | $626,351+ |