Built for the 2026 tax year
Calculators use fixed federal thresholds and rules for 2026, with primary sources identified on each tool.
2026 federal tax planning
Make the tax math make sense
Focused US federal tax calculators that turn 2026 rules into practical estimates and clear calculation breakdowns.
Free to use No account required Calculations run in your browser
Calculation set2026 tax year
Start with your goal
What do you want to estimate?
- Most versatileMy federal income taxBuild a broad estimate from income, deductions, and credits.
- My marginal tax bracketSee how taxable income moves through the 2026 brackets.
- My refund or amount owedInclude withholding and payments in your federal estimate.
- Quarterly self-employment paymentsPlan estimated payments and review safe-harbor targets.
- Taxes on investmentsEstimate the impact of gains, losses, and crypto activity.
- Standard vs. itemized deductionsCompare deduction paths and their estimated tax effect.
- Child tax creditReview an estimate for CTC, ODC, and refundable ACTC.
Designed for useful answers
Planning tools with visible assumptions
Private by design
Form calculations run locally in your browser. Calculator entries are not sent to a TaxArith backend.
Clear calculation breakdowns
Review the estimate, its components, applicable thresholds, and plain language explanations.
The complete toolkit
Ten calculators, four clear topics
Income tax and refunds
Understand federal income tax, marginal brackets, and whether payments may result in a refund or amount owed.
- Tax Bracket CalculatorSee how your taxable income is distributed across the 2026 federal tax brackets.
- Federal Income Tax CalculatorEstimate your 2026 federal income tax from ordinary income, qualified dividends, long-term capital gains, deductions, and credits.
- Tax Refund CalculatorEstimate your 2026 federal tax refund or amount owed from income, deductions, credits, withholding, and tax payments.
Self-employment and payments
Estimate self-employment tax and plan federal estimated payments throughout the year.
Investments and capital gains
Model the federal tax effects of investment gains, crypto dispositions, losses, and harvesting decisions.
- Capital Gains Tax CalculatorEstimate the 2026 federal tax impact of capital gains, losses, carryovers, qualified-dividend stacking, and optional NIIT.
- Crypto Tax CalculatorEstimate the 2026 federal income-tax impact of taxable crypto dispositions, capital netting, loss carryovers, and long-term rate stacking.
- Tax-Loss Harvesting CalculatorCompare the 2026 federal tax effect of selected capital-loss sales after transaction costs, wash-sale adjustments, netting, deductions, and carryforward.
Deductions and credits
Compare deduction approaches and estimate selected federal tax credits for dependents.
A focused workflow
Plan before you file
- 1Choose the calculation you need.Start with one focused federal tax question.
- 2Enter the relevant federal tax details.Use only the fields that apply to the selected estimate.
- 3Review the estimate and calculation breakdown.See the result, assumptions, thresholds, and limitations.
Federal estimates only
Know what the estimate covers
TaxArith is built for focused planning questions—not a complete tax return.
Explore calculators- Calculators use fixed rules and thresholds for the 2026 tax year.
- Results are planning estimates, not tax return preparation.
- State and local taxes are not modeled by these federal tools.
- TaxArith does not provide tax, financial, or legal advice. Draft IRS forms and instructions should be rechecked after final versions are published.