2026 Capital Gains Tax Calculator
Estimate 2026 federal tax attributable to net short- and long-term capital gains by stacking them above ordinary taxable income.
- Formula
- Shown below
- Data
- Stays private
- Result
- Updates live
Written by the ToolGrym Editorial Team
Last reviewed:
Calculation workspace
Enter your numbers
No submit button — results update as you type.
Estimated 2026 federal tax on gains
$1,583
Incremental regular tax attributable to the entered gains
- Tax on short-term gain
- $0
- Tax on long-term gain
- $1,583
- Effective rate on entered gains
- 7.9%
Long-term gain rate bands
$20,000
Long-term gain stacked above ordinary income and short-term gain
- Taxed at 0%
- $9,450
- Taxed at 15%
- $10,550
- Taxed at 20%
- $0
This simplified federal estimate excludes capital-loss netting mechanics, carryovers, qualified dividends, collectibles, unrecaptured Section 1250 gain, Section 1202, Net Investment Income Tax, state tax, and AMT.
How the 2026 capital-gain estimate works
Capital gains do not use one flat federal rate. Net short-term gain generally behaves like ordinary taxable income. Net long-term gain is stacked above ordinary taxable income and short-term gain, then allocated across the 0%, 15%, and 20% long-term bands.
For 2026, the top of the 0% band is $49,450 for single and married-filing-separately returns, $98,900 for married filing jointly, and $66,200 for head of household. The top of the 15% band is $545,500 for single filers, $306,850 for married filing separately, $613,700 for married filing jointly, and $579,600 for heads of household. Long-term gain above the applicable 15% ceiling is placed in the 20% band.
Worked example: a gain crossing the 0% line
Assume a single filer has $40,000 of ordinary taxable income and $20,000 of net long-term gain. The first $9,450 of long-term gain fills the remaining room below the $49,450 zero-rate ceiling. The remaining $10,550 falls into the 15% band, producing approximately $1,583 of long-term capital-gain tax before other rules.
The entire $20,000 is not taxed at 15%. Stacking preserves the unused zero-rate space first. The same logic can split larger gains across three rates.
Short-term gains use ordinary layers
The calculator estimates tax attributable to short-term gain as the difference between regular federal tax on ordinary taxable income alone and regular tax after adding short-term gain. That incremental method recognizes that a short-term gain can cross several ordinary brackets.
If deductions have not yet been applied, estimate ordinary taxable income first with the federal income tax calculator. Do not enter gross income in the ordinary-taxable-income field.
Important exclusions
Real Schedule D calculations net gains and losses by holding period and account for carryovers. Different maximum rates may apply to collectibles and unrecaptured Section 1250 gain. Qualified dividends share the preferential-rate worksheet, while the 3.8% Net Investment Income Tax may apply separately at higher income levels. The sale of a home, business property, qualified small-business stock, or an opportunity-zone investment may involve additional rules.
This tool is a transparent scenario estimate, not a substitute for Form 8949, Schedule D, or professional advice on a transaction.
Frequently asked questions
- What is the difference between short- and long-term capital gains?
- A gain is generally short term when the asset was held one year or less and long term when held more than one year. Short-term gains generally use ordinary income rates.
- Can part of one long-term gain be taxed at different rates?
- Yes. Long-term gains stack above other taxable income, so portions of the same net gain can occupy the 0%, 15%, and 20% bands.
- Should ordinary income be gross income?
- No. Enter ordinary taxable income after applicable adjustments and deductions, excluding the short- and long-term gains entered in the other fields.
- Does this include the Net Investment Income Tax?
- No. The 3.8% NIIT, state tax, qualified dividends, collectibles, unrecaptured Section 1250 gain, Section 1202, AMT, and special transactions are excluded.
Sources
People also calculate
- Required Minimum Distribution CalculatorEstimate a required minimum distribution from a retirement balance and the IRS distribution period. Use the official IRS table for the exact factor.
- 2026 Take-Home Pay CalculatorEstimate 2026 take-home pay using federal tax brackets, standard deductions, Social Security, Medicare, pre-tax deductions, and a state-rate input.
- 2026 Self-Employment Tax CalculatorEstimate 2026 self-employment tax on business profit, including Social Security, Medicare, Additional Medicare tax, and the deductible half.
Continue learning
- How Required Minimum Distributions WorkLearn the RMD balance-and-divisor formula, required beginning dates, tax treatment, and why the exact IRS table matters.
- Gross Pay vs. Net Pay: What Reaches Your AccountUnderstand federal income tax, FICA, pre-tax deductions, state estimates, and why payroll withholding can differ from your final tax bill.
- Self-Employment Tax Explained for 2026Understand the 92.35% earnings factor, Social Security wage base, Medicare tax, Additional Medicare tax, and deductible half of SE tax.
Written by
The ToolGrym editorial team builds and maintains every calculator on this site. Each tool’s formulas are implemented as tested code and verified against authoritative sources such as the CFPB, Federal Reserve, IRS, and BLS.