How Much Tax Will I Pay on Capital Gains in 2026?

Sell a stock you’ve held over a year for a $30,000 profit on a $90,000 income, and your federal capital gains tax is $4,500 — every dollar at 15%. But a slightly lower income could make part of that gain tax-free, and a higher one could add a 3.8% surtax. This guide answers the questions investors ask before they sell in 2026.

Run your own numbers with the free capital gains tax calculator — it uses the official 2026 thresholds.

How much tax will I pay on capital gains in 2026?

Long-term gains (assets held over a year) are taxed at 0%, 15%, or 20% depending on your taxable income. Most investors pay 15%: for single filers, that rate covers taxable income from $49,450 to $545,500. Below $49,450 the rate is 0% — no federal tax at all. Above $545,500 the excess is taxed at 20%.

The gain stacks on top of your other income, so the same $30,000 gain costs $0 to a low-income retiree, $4,500 to a mid-income earner, and up to $7,140 (20% plus NIIT) to a top earner. Your income — not the size of the gain alone — decides the rate.

What are the 2026 capital gains brackets?

Per IRS Revenue Procedure 2025-32, the long-term thresholds on taxable income (after deductions) are: Single — 0% to $49,450, 15% to $545,500; Married filing jointly — 0% to $98,900, 15% to $613,700; Head of household — 0% to $66,200, 15% to $579,600; Married filing separately — 0% to $49,450, 15% to $306,850. Income above the 15% ceiling is taxed at 20%.

These brackets are wide — especially the 15% band, which spans nearly half a million dollars for single filers. Splitting a very large gain across two tax years (selling part in December, part in January) can keep more of it inside the 15% band, or even recreate 0% room in the second year.

What is the difference between short-term and long-term gains?

The calendar. Sell an asset held one year or less and the gain is short-term, taxed at your ordinary income rates of 10% to 37% — the same as wages. Hold it more than one year and it becomes long-term, taxed at the preferential 0%, 15%, or 20%. The holding period starts the day after you buy and includes the day you sell.

The difference is not small: on the calculator’s default example, a $30,000 gain costs $6,886 short-term versus $4,500 long-term — a $2,386 reward for patience on a single sale. Before selling any winner, check its anniversary date; a few days can be worth thousands.

How does the 0% capital gains bracket work?

Your ordinary income fills the 0% band first, and the gain uses whatever room remains. A married couple with $80,000 of taxable income has $18,900 of space below their $98,900 threshold, so their first $18,900 of long-term gain is taxed at 0% and only the rest at 15%. In a low-income year — between retirement and RMD age, for instance — a couple can realize nearly $99,000 of gains completely tax-free.

This is why the 0% band drives real strategy: harvest gains in gap years, step up your cost basis for free, and beware that a big Roth conversion or a one-time income spike in the same year eats the room your gains needed. Coordinate the two before December 31.

What is the 3.8% net investment income tax?

The NIIT is an extra 3.8% on investment income — including capital gains — when your modified adjusted gross income passes $200,000 (single/head of household), $250,000 (married filing jointly), or $125,000 (married filing separately). It applies to the smaller of your investment income or the amount by which your income exceeds the threshold.

Unlike the brackets, these thresholds are fixed in law and never adjust for inflation, so they catch more filers every year. A large one-time gain can push you over by itself — one more reason a major sale deserves a projection first. Our calculator includes an NIIT estimate with its result.

How can I reduce capital gains tax legally?

The standard toolkit: hold past one year for the lower rates; harvest losses to offset gains dollar for dollar (plus $3,000 a year against other income); realize gains in low-income years to use the 0% band; split big sales across two Decembers; donate appreciated stock to charity to skip the gain entirely; and keep tax-inefficient assets inside retirement accounts where gains are never taxed year by year.

What does not work: selling and immediately rebuying to “reset” a gain you wanted taxed at 0% is fine (the wash-sale rule applies only to losses), but manufactured losses, sham transfers, and hiding sales are not strategies — they are audit bait. Every technique above is plain IRS law, documented in Publication 550.

When is the tax due on a capital gain?

The gain is income in the year you sell, reported on the return you file the following spring — but a large gain can trigger an estimated-tax obligation in the quarter of the sale. If the sale pushes your total tax well beyond your withholding, pay an estimate by that quarter’s deadline to avoid an underpayment penalty, even if you settle up in April.

Sold in December 2026? The fourth-quarter estimate is due January 15, 2027 — but withholding counts as paid evenly all year, so a January salary adjustment or an IRA distribution with withholding can sometimes cure a shortfall more simply. A quick projection with the paycheck calculator shows where your withholding stands.

Frequently Asked Questions

Do I pay capital gains tax if I reinvest the money?

Yes. Reinvesting does not defer the tax — outside of retirement accounts and specific programs like Opportunity Zones, a sale is a taxable event the moment it happens, whether the proceeds sit in cash or go straight into another stock. Only the sale matters, not what you do next.

How much can I sell tax-free in 2026?

As much gain as fits under your 0% threshold after your other income: up to $49,450 of total taxable income for single filers and $98,900 for married couples filing jointly. A retired couple with $60,000 of other taxable income could realize about $38,900 of long-term gains at a 0% federal rate.

Are capital gains taxed by states?

Usually yes, at ordinary state rates — most states offer no preferential capital gains rate, so a 15% federal gain in California costs roughly another 9.3% state tax. A handful of states exempt or specially tax gains, and no-income-tax states charge nothing. The calculator covers federal only.

What about selling a house?

If you owned and lived in it for at least two of the last five years, you can exclude $250,000 of gain ($500,000 married filing jointly) before any capital gains tax applies. Only the excess is taxed — and keep records of improvements, which raise your cost basis and shrink the taxable gain.

Thresholds per IRS Revenue Procedure 2025-32; rules per IRS Topic No. 409 and Publication 550, as of 2026. Educational content, not tax advice — model any major sale with a tax professional before year-end.