Deterministic Federal Tax Calculators
All calculations are executed in integer cents using official IRS statutory rules (IRS IRB 2025-45 / OBBBA for 2025 and Rev. Proc. 2025-32 for 2026). Select the calculator that matches your taxpayer situation below.
Form 1040
Federal Income Tax Calculator
Accurate progressive bracket calculations for W-2 wages, official IRS standard deductions, and federal withholding balances.
- 2025 & 2026 IRS progressive tax brackets
- Single, Married Joint, and Head of Household
- Deterministic refund / amount owed estimation
Schedule SE
Self-Employed Tax Calculator
Compute Schedule SE self-employment tax (15.3%), net business profit factors, and above-the-line AGI adjustments.
- Statutory 92.35% net profit factor
- Social Security wage base cap logic ($176.1k / $184.5k)
- 50% above-the-line deduction adjustment
1099-NEC & 1099-K
1099 Contractor Tax Calculator
Specialized calculator for freelancers, consultants, and gig economy workers with deductible expense categories.
- Ordinary & necessary business expense tracking
- Recommended tax savings set-aside percentage
- Net take-home estimation
Form 1040-ES
Quarterly Estimated Tax Calculator
Plan your IRS Form 1040-ES estimated quarterly payments across all four payment periods to prevent penalties.
- Four equal installment vouchers
- Official IRS payment due dates
- Safe harbor threshold reminders
Educational Tax Estimation Notice
TaxAIHelp calculations are deterministic estimates based on standard IRS federal tax formulas. They are designed to help you understand your general tax obligations and deductions. TaxAIHelp is not an IRS-endorsed service, and our calculations do not replace certified CPA or Enrolled Agent filing reviews. Unsupported tax scenarios (such as complex foreign income or specialty state tax credits) must be evaluated with a qualified tax professional. Learn more about our standards.