How the Holding Period Decides Short or Long-Term Gains

Is a year 365 days, or the same date next year? For US shares, neither.

The IRS rule has two parts. Shares held for more than one year produce a long-term gain or loss. One year or less is short term. Everything hangs on the words “more than”, because a holding of exactly one year, to the day, is still short term, and a trader who reads the rule quickly and assumes that reaching the anniversary is enough will sell one day too early and get the treatment they were waiting to avoid.

How the count runs

The holding period generally starts the day after the purchase trade date. It includes the sale date.

Settlement plays no part. Read the trade dates on your confirmations. The count runs on the calendar, weekends and market holidays included, so a purchase made on a Friday starts its holding period on the Saturday, whether or not the market was open that day.

Put the two pieces together and the test is simple. Shares become long term if you sell them on the day after the anniversary of the purchase, or later.

That single day is the trap. It is also invisible at the time of the sale, since nothing on the order ticket tells you which side of the line you are on, and the mistake surfaces only months later, when the tax forms arrive and the gain sits in the short-term section of the 1099-B where you expected to see it listed as long term.

Mark the day after the anniversary. Sell on that day or after it.

Why the line matters

Short-term gains are generally taxed at ordinary income rates. Long-term gains have their own set of rates. For many taxpayers those are lower, though the figures depend on income and filing status and change over time.

The same gain can therefore cost different amounts of tax. The only variable is the date.

Losses follow the split too. Short-term and long-term results are netted within their own groups first, and whatever is left over then crosses between them. IRS Publication 550 explains the netting.

A position that is up and a few weeks short of the line turns the calendar into part of the trade. Holding on carries market risk. Selling early carries a tax cost. Neither wins automatically. How much the tax difference is worth, set against how far the price could move against you in the weeks left to wait, is a judgment you can only make with your own numbers and, where the sums are large, with a tax professional.

Lots and wash sales

Each purchase is its own lot. Each lot has its own date.

When you sell part of a position, the lots you sell decide the holding period of that sale, so two sales of one stock in a single session can land on opposite sides of the line if they draw on different lots, which is one reason choosing tax lots before selling matters. Each lot’s date sits alongside its cost basis on your broker’s lot detail page.

Wash sales move the clock. When a loss is disallowed under the wash sale rule, the replacement shares inherit the old shares’ holding period.

Say you held shares for eleven months, sold them at a loss, and bought them back within the window. The replacement lot starts with those eleven months already counted. Hold it for a little over a month more and a sale of it can come out long term, even though the lot itself is new.

Checking your own dates

Open the lot view for any position you are thinking of selling. Each lot should show an acquisition date. Many platforms also label lots as short or long term.

Check the label against the arithmetic. Lots adjusted by wash sales are where a display is most likely to be wrong.

IRS Publication 550 covers the holding period in full, including special cases this page leaves out, such as shares received as gifts or through an inheritance. Keep your own trade confirmations as a backup, as set out in what records a trader should keep for taxes, and take anything unusual to a tax professional.