2026 Federal Capital Gains Brackets and Calculator Limits

The 2026 long-term thresholds

IRS Revenue Procedure 2025-32 sets the 2026 long-term capital gains thresholds. The 0% bracket ends at $49,450 of taxable income for single filers, $98,900 for married couples filing jointly, $49,450 for married filing separately, and $66,200 for heads of household.

The 15% bracket extends to $545,500 for single filers, $613,700 for joint filers, $306,850 for married filing separately, and $579,600 for heads of household. Taxable income above the applicable upper threshold enters the 20% long-term bracket.

Those thresholds are not a separate allowance for capital gains. Long-term gain sits on top of other taxable income when the brackets are applied. A single filer with $40,000 of other taxable income does not automatically receive another $49,450 at 0%; only the remaining room in the 0% bracket is available.

Holding period still determines the rate system

A capital asset generally needs to be held for more than one year to receive long-term treatment. A holding period of one year or less is short-term, and a net short-term gain is generally taxed through the ordinary income brackets.

The date difference can matter, but tax should not be the only reason to hold an investment. Price risk, diversification, transaction costs, liquidity needs, and the possibility of a rule applying differently to a particular asset can outweigh an estimated rate change.

Gain Tax Calculator classifies a sale as long-term only when the sale date is later than the one-year anniversary of the purchase date. It supports sales in tax year 2026 and rejects other sale years rather than silently applying the wrong table.

How losses change the calculation

Capital losses generally offset capital gains before the preferential rates are applied. A short-term loss can reduce a net long-term gain, while a long-term loss can reduce a net short-term gain after the applicable netting steps.

The calculation engine now offsets opposite-signed short-term and long-term results before estimating federal tax. The quick web form accepts one sale, so it cannot reproduce a complete Schedule D with every transaction, carryforward, or the annual deduction of a net capital loss against ordinary income.

For a portfolio-level result, gather every realized transaction and any prior-year capital-loss carryforward. Treat the one-sale estimate as a reasonableness check, not a replacement for the tax forms.

NIIT is a separate calculation

The 3.8% Net Investment Income Tax uses modified adjusted gross income and net investment income. The statutory thresholds include $200,000 for single or head-of-household filers and $250,000 for married couples filing jointly.

Gain Tax Calculator does not calculate NIIT. Its taxable-income field does not establish MAGI, excluded income, or every component of net investment income. The result panels say NIIT is excluded so a user is not given a falsely precise total.

State estimates are intentionally simplified

Selected state results apply one documented headline rate to the estimated net gain. They do not model every state bracket, deduction, local income tax, special capital-gain deduction, surtax, residency allocation, source-income rule, or asset exclusion.

Texas and Florida are displayed with a zero individual income-tax assumption, but that does not prove another state has no claim on source income. Washington also has asset exclusions, deductions, and tiered rates that cannot be represented by one percentage.

A practical verification workflow

1. Confirm the filing status and 2026 taxable-income estimate.
2. Reconcile purchase price, fees, improvements, depreciation, and sale expenses to source documents.
3. Verify the holding period and whether a special asset rule applies.
4. Compare the federal thresholds with IRS Revenue Procedure 2025-32.
5. Evaluate NIIT, state brackets, local tax, carryforwards, and estimated payments separately.
6. Review a material transaction with a qualified professional before acting or filing.

Key takeaways

• The site uses the 2026 federal brackets published by the IRS.
• Long-term gains stack on top of other taxable income.
• Opposite-signed short-term and long-term results are netted before federal tax is estimated.
• NIIT and a full state return are outside the calculator’s scope.
• The output is an educational estimate with visible assumptions, not tax advice.