Alaska Capital Gains Tax Calculator - Estimate Your Alaska Capital Gains Tax

The Alaska capital gains tax calculator estimates the tax on a profit from selling an investment, home, or other capital asset when you live in Alaska. Alaska is one of nine states that does not levy a state individual income tax, so a realized gain is taxed only by the federal government. The calculator applies the federal long-term and short-term capital gains rules, adds the 3.8% net investment income tax when your income is high enough, and reports the Alaska state portion as zero.

• • Selling brokerage investments: Estimate the federal tax on a stock or fund sale before you decide how much to liquidate.
• • Realizing a gain on a second home: See the federal bill on a property sale, knowing Alaska will not add a state capital gains tax.
• • Comparing a short vs long hold: Check how holding an asset past one year changes the rate from ordinary income to the preferential brackets.
• • Planning around the NIIT threshold: Find out whether your modified adjusted gross income crosses the 3.8% net investment income tax line.

A capital gain is the difference between what you sold an asset for and what you paid for it, including improvement and closing costs in your basis.

Because Alaska has no state income tax, the only tax that applies to the gain is federal, which keeps the math simpler than in states that tax investment income on top of the federal bill.

To see why the state line stays at zero here, compare the take-home picture in the Alaska income tax calculator.

The calculator builds the result in three steps: it finds the realized gain, applies the correct federal rate, and then confirms the Alaska state tax is zero. The exact bracket thresholds come from the IRS guidance for the current tax year.

• saleProceeds: The gross amount received when the asset was sold.
• costBasis: Original purchase price plus improvements and allowable fees.
• holdingPeriod: Long-term (over one year) uses 0/15/20% rates; short-term uses ordinary income brackets.
• filingStatus: Picks the federal rate brackets and the net investment income tax threshold.
• federalTaxableIncome: Other income for the year that determines which long-term bracket the gain lands in.
• magi: Modified adjusted gross income used to test the 3.8% net investment income tax.

Long-term gains are taxed progressively: for tax year 2025 a single filer pays 0% up to $48,350 of total income, 15% up to $533,400, and 20% above that, so a large gain can span two brackets.

Short-term gains skip the preferential rates and are added to your ordinary income, which can push part of the gain into a higher marginal bracket.

According to IRS Tax Topic No. 409, long-term capital gains are taxed at 0%, 15%, or 20% depending on your taxable income, while short-term gains are taxed as ordinary income

As published by IRS Rev. Proc. 2024-40, the 2025 long-term capital gains bracket thresholds for a single filer are $48,350 and $533,400

For a version that layers in a state rate, open the US capital gains tax calculator to see the difference Alaska's zero state tax makes.

Four ideas drive the number: the holding-period split, the preferential brackets, the net investment income tax, and Alaska's lack of a state income tax.

The blended long-term rate is usually below the top 20% mark because the first slice of gain falls into the lower brackets.

Alaska's zero state tax is the main reason a gain here can cost noticeably less than the same gain realized in a state that taxes investment income.

The brackets that set your short-term rate are the same ones modeled in the federal income tax calculator.

Enter your sale details and income, then read the federal result with the Alaska state line shown as zero.

1. 1 Enter sale proceeds and cost basis: Put the amount you sold the asset for and what you paid plus improvements and fees.
2. 2 Pick the holding period: Choose long-term if you held the asset more than one year, otherwise short-term.
3. 3 Select your filing status: This sets the federal brackets and the net investment income tax threshold.
4. 4 Add your other income and MAGI: Enter remaining taxable income and modified adjusted gross income to place the gain in the right bracket and test for the 3.8% tax.
5. 5 Read the result: Note the federal tax, any net investment income tax, the zero Alaska state tax, and the effective rate.

A single Alaska resident with $60,000 of other income who sells for $50,000 an asset that cost $30,000 sees a $20,000 long-term gain taxed at 15% federally, with no Alaska state tax and a total of $3,000.

After the sale, see how the gain flows into take-home pay with the Alaska paycheck calculator.

The tool turns federal bracket tables into a single number you can plan around.

• • Shows the true Alaska cost: It makes the zero state tax explicit, so you are not double-counting a state bill that does not exist.
• • Handles blended brackets: Large gains that cross the 15% and 20% lines are split correctly instead of rounded to one rate.
• • Flags the NIIT: It warns you when modified adjusted gross income crosses the 3.8% net investment income tax threshold.
• • Compares hold lengths: Switching the holding period shows the gap between ordinary-income and preferential rates in the same view.

Planning a sale around the one-year mark is easier when you can see the rate change before you commit.

Because there is no Alaska state layer, the result reflects only federal policy, which is the part that changes most often between tax years.

If the asset you are selling is real estate, the recurring bill is covered by the Alaska property tax calculator.

Several inputs move the result, and a few situations are outside a simple estimate.

• • The estimate ignores state capital gains taxes from other states, which matter if you moved during the year or the asset sits in another state.
• • It does not model the capital gains exclusion on a primary home, loss carryforwards, or the alternative minimum tax.
• • Rates shown reflect the current IRS tables and should be confirmed against your return or a tax professional.

A home sale can qualify for an exclusion of up to $250,000 ($500,000 married) of gain, which would lower the taxable amount below what you enter here.

If you realize a loss, the calculator reports zero tax because a loss does not create a current capital gains bill, though it may offset other gains.

According to IRS Form 8960, the 3.8% net investment income tax applies to net investment income when modified adjusted gross income exceeds $200,000 for single filers and $250,000 for those married filing jointly

Investment income subject to the same 3.8% net investment income tax is modeled in the dividend tax calculator.