Custom Federal Income Tax Calculator
Estimate taxes for any year by customizing the tax brackets and rates below
Tip: This calculator allows you to set your own tax brackets and rates, making it usable for any current or future tax year without requiring updates.
Income Information
Custom Tax Brackets
Credits & Adjustments
Tax Estimation Summary for
Taxable Income:
Marginal Tax Rate:
Estimated Tax:
Tax Credits:
$0.00
0%
$0.00
$0.00
Total Tax Due: $0.00
Tax Breakdown by Bracket:
How to Use This Custom Tax Calculator
Setting Up Brackets
- Add/remove brackets as needed for your tax system
- Set the minimum and maximum income for each bracket
- Enter the tax rate (percentage) for each bracket
Important Notes
- Brackets should be consecutive with no gaps
- The last bracket should have no maximum limit
- Rates should be progressive (higher for higher brackets)
Frequently Asked Questions
How do I find the correct tax brackets for a future year?
For future years, you'll need to research proposed or estimated tax brackets from government sources or tax policy organizations. This calculator lets you input whatever brackets you want to model different scenarios.
What should I enter for the last bracket's maximum?
For the highest bracket, leave the maximum field empty or set it to an extremely high number. This indicates income above that minimum amount is taxed at that rate with no upper limit.
Can I model tax law changes with this calculator?
Yes! That's exactly what this calculator is designed for. Simply adjust the brackets and rates to match proposed changes, then calculate how they would affect your tax liability.
How are deductions applied in the calculation?
Deductions are subtracted from your gross income to determine your taxable income. The calculator then applies your custom tax brackets to this taxable income amount.
Why doesn't the calculator include state taxes?
This tool focuses specifically on federal income tax. However, you could use it for state taxes by entering state-specific brackets and rates instead of federal ones.