US Federal Taxes
Estimate federal income tax and related items: filing status, withholding, payroll, capital gains, AMT, credits, and transfer taxes.
Income Tax (Single)
Brackets, deductions, credits.
Income Tax (MFJ)
Joint brackets & credits.
Income Tax (HoH)
Thresholds & dependents.
W-4 Withholding
Dial in allowances.
Paycheck
Take-home estimator.
Self-Employment Tax
SE & half-deduction.
Capital Gains (Short)
Ordinary rates ≤1y.
Capital Gains (Long)
Preferential rates.
AMT
Compare vs. regular tax.
EITC
Refundable credit.
Child Tax Credit
Phaseouts & refunds.
Social Security Tax
FICA wage base.
Medicare Tax
Additional tax thresholds.
Estate Tax
Exemption & portability.
Gift Tax
Annual & lifetime.
Formula (LaTeX) + variables + units
This section shows the formulas used by the calculator engine, plus variable definitions and units.
Formula (extracted LaTeX)
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Variables and units
- T = property tax (annual or monthly depending on input) (currency)
Sources (authoritative):
- Finance — calcdomain.com · Accessed 2026-01-19
https://calcdomain.com/finance - Income Tax (Single)Brackets, deductions, credits. — calcdomain.com · Accessed 2026-01-19
https://calcdomain.com/federal-income-tax-single - Income Tax (MFJ)Joint brackets & credits. — calcdomain.com · Accessed 2026-01-19
https://calcdomain.com/federal-income-tax-married-filing-jointly - Income Tax (HoH)Thresholds & dependents. — calcdomain.com · Accessed 2026-01-19
https://calcdomain.com/federal-income-tax-head-of-household - W-4 WithholdingDial in allowances. — calcdomain.com · Accessed 2026-01-19
https://calcdomain.com/w4-withholding - PaycheckTake-home estimator. — calcdomain.com · Accessed 2026-01-19
https://calcdomain.com/paycheck - Self-Employment TaxSE & half-deduction. — calcdomain.com · Accessed 2026-01-19
https://calcdomain.com/self-employment-tax - Capital Gains (Short)Ordinary rates ≤1y. — calcdomain.com · Accessed 2026-01-19
https://calcdomain.com/short-term-capital-gains-tax
Changelog
Version: 0.1.0-draft
Last code update: 2026-01-19
Last code update: 2026-01-19
0.1.0-draft · 2026-01-19
- Initial audit spec draft generated from HTML extraction (review required).
- Verify formulas match the calculator engine and convert any text-only formulas to LaTeX.
- Confirm sources are authoritative and relevant to the calculator methodology.