Net Investment Income Tax Calculator (US)
Estimate the 3.8% Net Investment Income Tax based on investment income and MAGI.
NIIT details
This calculator auto-updates when values change.
This calculator provides a simplified US tax estimate only. Actual tax treatment may vary based on income, filing status, deductions, credits, state rules, local rules, transaction type, and IRS guidance. Results are for informational purposes only and are not tax advice.
Results
Results update automatically.
Estimated NIIT
$1,900.00
The 3.8% Net Investment Income Tax applies to the lesser of net investment income or excess MAGI. Your estimated taxable NIIT base is $50,000.00.
Visual breakdown
About This Net Investment Income Tax Calculator (US)
This calculator helps estimate tax-related outcomes using simplified assumptions and clear input fields.
Use it for planning and comparison only. Complex tax rules may require professional advice.
How to Use This Calculator
- 1
Enter the main income or transaction values
Add the investment, rental, crypto, state income, or MAGI values relevant to the calculator.
- 2
Add expenses, deductions, or fees
Include fees, expenses, depreciation values, or deductions where applicable.
- 3
Check the estimate
The result card and breakdown update automatically.
- 4
Adjust assumptions
Change tax rates or values to compare scenarios.
Frequently Asked Questions
Is this calculator exact?v
No. It provides a simplified estimate for planning only.
Does this replace tax advice?v
No. It is not tax, legal, accounting, or financial advice.
Why might actual tax differ?v
Actual tax can vary due to filing status, income type, deductions, credits, cost basis, local rules, and IRS guidance.
Does this auto-update?v
Yes. Results update automatically when inputs change.