Capital Gains Tax Calculator 2026 — Federal & State Rates
Calculate US federal and state capital gains tax for short-term and long-term asset sales, including the 3.8% Net Investment Income Tax (NIIT).
⚙️ Calculation Parameters
📊 Real-Time Analysis
Institutional Mathematical Principles & US Regulatory Methodology
Accurate financial planning requires uncompromised computational fidelity. In accordance with federal standards and standard US banking underwriting practices, this tool calculates exact amortization curves, tax brackets, and cash flow projections.
Core Mathematical Formula
By eliminating bank spreads, hidden dealer fees, and estimated ranges, users receive exact quantitative breakdowns designed for verifiable decisions before executing financial commitments.
Strategic Guidance for US Consumers
- Verify Against Primary Documents: Always cross-examine calculations against official IRS Form 1040 schedules, loan estimates, or brokerage statements.
- Factor In State Variations: Many US states impose local taxes, mill rates, or compliance regulations that supplement federal baseline thresholds.
- Automate Periodic Reviews: Recalculate your metrics semi-annually as interest rates, statutory contribution limits, and inflation indexes shift.
Frequently Asked Questions
What is the difference between short-term and long-term capital gains?
Assets held for 365 days or less are classified as short-term capital gains and taxed as ordinary income (up to 37%). Assets held for longer than one year qualify for favorable long-term tax rates of 0%, 15%, or 20%.
What is the Net Investment Income Tax (NIIT)?
The NIIT is a 3.8% surtax established under IRC Section 1411 on net investment income for individuals whose modified adjusted gross income exceeds $200,000 for single filers or $250,000 for married couples filing jointly.
Do all US states tax capital gains?
Most states tax capital gains as regular income. States with no personal income tax (Texas, Florida, Nevada, Washington, Wyoming, South Dakota, Alaska) do not tax capital gains.
Can capital losses offset capital gains?
Yes. Capital losses can offset capital gains dollar-for-dollar without limit. Excess losses up to $3,000 can reduce ordinary taxable income each year.