Tax-Loss Harvesting in Q4: The Wash-Sale Calendar and Where Options Complicate It

Investors who hold appreciated positions can face larger realized gains whenever they sell, and capital gains are taxed for the year of the sale. With about twelve weeks left in 2026, here's a general, calendar-first look at tax-loss harvesting (selling a holding at a loss), the wash-sale rule, and where options trades complicate things.

Why the calendar matters

Capital gains are taxed for the year you sell. Under IRS Topic 409, gains and losses are first netted within short-term (held one year or less) and long-term (held more than one year) buckets, then against each other. Short-term gains are taxed as ordinary income. Net losses can offset up to $3,000 of ordinary income per year ($1,500 if married filing separately), and any excess carries forward.

The last trading day of 2026 appears to be Thursday, December 31, based on the NYSE holiday calendar, which lists early closes on Friday, November 27 and Thursday, December 24. Confirm dates with your broker, since trade-versus-settlement timing details matter at year-end.

Where the rates sit in 2026

Per IRS Rev. Proc. 2025-32, the 2026 long-term capital gains rate is 0%, 15%, or 20% depending on taxable income.

• Single filers: 0% applies up to $49,450 and 15% up to $545,500.
• Married couples filing jointly: those figures are $98,900 and $613,700.

The net investment income tax adds 3.8% for higher earners, with statutory thresholds of $200,000 for single filers and $250,000 for joint filers (IRS Topic 559). These are illustrations of how the rules are structured, not a statement about anyone's situation.

The wash-sale rule, with dates

A wash sale happens when you sell a security at a loss and buy a substantially identical security within 30 days before or after the sale, a 61-day window in total (IRS Publication 550). The loss isn't erased. It's disallowed for now and generally added to the cost basis (the amount used to figure your gain or loss) of the replacement shares.

Here's where the calendar bites. Suppose a position is sold at a loss on December 15, 2026. A repurchase on any day through January 14, 2027 is inside the window, even though it falls in the new tax year. The first date outside the window would be January 15.

Options make it messier

Pub 550 says the wash-sale rule can apply to contracts or options to acquire substantially identical stock, so options trades deserve extra care:

• Buying a call shortly before or after selling the stock at a loss can raise wash-sale questions.
• Selling a put that is later assigned means you acquire the stock, which can count as a purchase.
• Rolling positions can repeatedly reopen exposure inside the window.
• Other accounts can matter. The IRS has addressed purchases made in an IRA in published guidance, and such a purchase can trigger the rule, so don't assume a different account sidesteps it.
• Broad-based index options are generally taxed under separate rules from stock options, so don't assume the same treatment.

Options involve risk, including loss of the entire premium paid and assignment obligations, and are not suitable for everyone. Nothing here suggests using options to manage a tax outcome, and tax treatment depends on the specific contract and the individual's situation. Whether two securities are "substantially identical" is a facts-and-circumstances question, and the IRS provides no bright-line list for funds that track similar indexes.

Risks of harvesting for its own sake

• Selling to book a loss means being out of the position, so the stock or fund can rise during the waiting period.
• Trading costs and bid/ask spreads add up.
• Harvesting is mostly about timing: a deferred loss reduces basis and may bring a larger gain later.

Items investors commonly review at year-end (general information)

Whether any of this applies depends on individual circumstances, so a tax professional is the right first call. Investors often start by:

1. Reviewing a realized gain/loss report from each account.
2. Separating short-term from long-term results.
3. Noting the 30-day windows before and after any sale made at a loss.
4. Checking IRAs and other accounts for related purchases.

This article is educational commentary on tax rules, not personalized investment, trading, or tax advice.