Short-Term vs Long-Term Capital Gains: Why Day 366 Matters

By Tom, CPA · Updated October 27, 2026

Part of: Tax Planning

TL;DR: Hold an investment more than one year and the gain is long-term, taxed at 0%, 15% or 20%. Sell a day earlier and it is short-term, taxed like wages at up to 37%. Count the days carefully, and know the special rules for gifts, inheritances and wash sales.

Educational only, not tax, legal, or investment advice. Examples are illustrations, not predictions. Rules and limits change; verify current figures and talk to a qualified professional about your situation.

Few lines in the tax code are worth as much money per day as the one-year holding period. On one side, gains are taxed at ordinary income rates of up to 37%. On the other, the same gain might be taxed at 15%, or at 0% for households with modest taxable income. The difference on a $20,000 gain for someone in the 24% bracket is $1,800.

This comparison guide covers how to count the holding period, the 2026 rates on each side, how wash sales and other rules shift the clock, worked examples and how to plan around day 366. It is part of the capital gains tax planning series and the broader tax planning guide. Figures are 2026 as of October 27, 2026.

CPA Warning Label: Selling a winner on day 365 is the financial equivalent of leaving the theater five minutes before the end of the movie, and paying extra for the privilege.

Holding period counting

Under Section 1222, a gain is long-term if the asset was held for more than one year. The IRS counting rule: your holding period starts on the day after you acquire the property and includes the day you dispose of it.

The practical rule

If you bought shares on March 3, 2025, the one-year anniversary is March 3, 2026. Selling on that date is still short-term, because you held exactly one year, not more. Selling on March 4, 2026 or later is long-term. In plain terms: wait until the day after the anniversary of the purchase date.

Trade date, not settlement date

For publicly traded stocks and funds, use the trade date for both the purchase and the sale. Settlement a day later does not change the holding period. A December 31 trade counts in that tax year even though it settles in January.

Special holding period rules

That last row surprises people. If you reinvest dividends monthly, you have a dozen new short-term lots every year. Selling the whole position can include a sliver of short-term gain or loss.

Rates

Short-term gains are added to ordinary income and taxed at the regular brackets: 10%, 12%, 22%, 24%, 32%, 35% or 37%. Long-term gains and qualified dividends use the 2026 capital gains thresholds:

Side by side

The 3.8% net investment income tax applies to both short-term and long-term gains above the MAGI thresholds ($250,000 joint, $200,000 single), so it does not change the comparison. State taxes usually treat both types the same.

Netting order

Short-term losses first offset short-term gains, and long-term losses offset long-term gains. Then the net amounts offset each other. Because short-term gains are taxed at higher rates, a short-term loss is generally more valuable than a long-term loss. If losses exceed gains, up to $3,000 a year offsets ordinary income and the rest carries forward, keeping its short-term or long-term character. Mechanics are in capital gains stacking rules.

Wash sales interplay

The wash sale rule disallows a loss if you buy substantially identical securities within 30 days before or after selling at a loss. The disallowed loss is added to the basis of the replacement shares, and the holding period of the old shares carries over to the new ones. Full details are in the wash sale rule guide.

Why it matters for the one-year line

• If you sell long-held shares at a loss and trigger a wash sale, the replacement shares inherit the long holding period. A later sale of the replacement can be long-term even if you held it only a few weeks.
• If the original shares were short-term, the replacement shares carry that short holding period forward and the clock does not restart.

Other clock-stoppers

Some hedging transactions can suspend or reset a holding period. Buying a put on a stock you have held for less than a year, or entering certain short sales against the box, can make the position short-term. Constructive sale rules can treat a hedged position as sold. Most index investors never touch these, but anyone using options on concentrated positions should check before assuming the clock is running.

Examples

Illustration 1: the impatient seller

Casey, single, has $120,000 of taxable wages in 2026 (24% bracket). She bought $30,000 of a fund on April 10, 2025 and it is now worth $50,000. On April 10, 2026, she sells, realizing a $20,000 short-term gain taxed at 24%: $4,800. If she had sold on April 11, the gain would be long-term at 15%: $3,000. Waiting one day was worth $1,800.

Illustration 2: the 0% zone

A retired couple has $40,000 of taxable ordinary income in 2026. They sell shares with a $30,000 gain. If long-term, total taxable income is $70,000, under the $98,900 0% threshold, so the gain is taxed at 0%. If short-term, it is ordinary income taxed mostly at 12%, about $3,600. Their savings from waiting: about $3,600.

Illustration 3: the inheritance

Alex inherits stock in June 2026 and sells it in August 2026 for $5,000 more than its date-of-death value. Even though Alex held it two months, the gain is long-term by rule. Because of the step-up in basis, only the $5,000 of post-death growth is taxable at all. See step-up in basis.

Illustration 4: the gift

A parent who bought shares in 2015 gives them to an adult child in 2026. The child takes the parent's basis and holding period, so a sale next week is long-term. If the child's taxable income is low enough, the gain may be taxed at 0%. If the child is under 24 and a student, the kiddie tax may apply; see capital gains and your kids for the real estate version.

Planning around day 366

Put the date on the calendar

When you buy something you might sell within a couple of years, note the long-term date. Most brokers show short-term and long-term unrealized gains separately; use that view before selling.

When selling early still makes sense

• The investment is risky and concentrated, and a few weeks of exposure could cost more than the tax difference.
• You have short-term losses to offset the gain anyway.
• The position is a small part of the portfolio and the tax difference is trivial.
• You are in the 0% long-term zone and also in the 10% or 12% ordinary bracket, where the difference is small.

Harvest losses before they turn long-term

A short-term loss offsets short-term gains taxed at your top ordinary rate. If you are going to harvest a loss, doing it before the one-year mark can make it more valuable. Then rebuy something similar but not substantially identical.

Rentals and other real property

The same one-year rule applies to real estate, which matters for house flippers and short holding periods. A flip sold within a year produces short-term gain, and if flipping is your business, the gain may be ordinary business income subject to self-employment tax. A rental held longer than a year generally produces Section 1231 gain, with depreciation recapture taxed at up to 25%. Rental sellers, including short-term rental owners, should confirm the holding period and recapture before listing.

Selling in retirement

Retirees who sell taxable investments to fund spending usually have long-term lots, so they can focus on picking high-basis lots and filling the 0% bracket. The timing question then becomes which year, not which day. Coordinate sales with other plans such as long-term care planning and Roth conversions. The capital gains harvesting calculator helps estimate the room you have.