Why Bad Stocks Get Worse in November (And How to Spot Year-End Bargains)
A blog about tax loss selling late in the year...a valuable tool for the value investor.
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I'm going to blog a piece about 'Tax loss selling' in my blog. For the benefit of the readers who don't know what that is, could you give me a working definition?
Tax-loss selling (also known as tax-loss harvesting) is an investment strategy where an investor deliberately sells an asset—such as a stock, ETF, or mutual fund—at a loss to offset capital gains realized from selling other investments at a profit.
By claiming these losses, investors lower their overall taxable capital gains, ultimately reducing their income tax bill for the tax year.
How It Works: A Quick Example
The Profit: You sell Investment A and make a $5,000 capital gain. Without any offsetting losses, you owe taxes on that full $5,000.
The Loss: You hold Investment B, which has dropped in value and is currently sitting at a $3,000 unrealized loss.
The Harvest: You sell Investment B to lock in (realize) that $3,000 loss.
The Net Taxable Gain: You subtract your loss from your gain ($5,000 − $3,000). You are now only taxed on a net capital gain of $2,000.
Key Concepts
Offsetting Income: If your capital losses exceed your capital gains in a given year, tax authorities (such as the IRS in the U.S. or the CRA in Canada) often allow you to use a portion of the remaining loss to offset regular income, or carry the losses backward/forward into other tax years.
The Wash-Sale Rule / Superficial Loss Rule: You cannot sell a security for a tax loss and immediately buy it back. Tax rules require you to wait a specific period (typically 30 days) before buying the same or a "substantially identical" asset, or the tax deduction is disallowed.
Tax Deferral, Not Avoidance: Tax-loss harvesting doesn't eliminate taxes forever—it delays them. Reinvesting in a new asset establishes a lower cost basis, meaning you may pay higher capital gains taxes later when that new asset is eventually sold.
Suggested Follow-Up Topics
Specific Country Rules: Tax rules vary significantly between jurisdictions (e.g., the U.S. 30-day Wash-Sale Rule vs. Canada's Superficial Loss Rule).
Step-by-Step Examples: Practical scenarios contrasting taxable vs. tax-advantaged accounts (like Roth IRAs or TFSAs, where tax-loss selling doesn't apply).
How long has 'tax loss selling' been around?
Tax-loss selling has been around for over a century, tracing its roots directly to the creation of modern capital gains tax laws in the early 20th century.
Here is a brief timeline of how the practice emerged and evolved:
1. The Early 1910s–1920s: Creation of Capital Gains Taxes
When the modern U.S. federal income tax was established under the 16th Amendment in 1913 (and Canadian tax framework in 1917), taxing investment gains naturally created an incentive for investors to offset those gains with losses. By the 1920s, tax-loss selling was widespread among Wall Street investors looking to reduce year-end tax liability.
2. The 1921 Wash-Sale Rule: Closing the Initial Loophole
Initially, investors would sell stocks at a loss on one day to claim the tax write-off and buy them back immediately the next morning. To stop this, the U.S. Congress introduced the Wash-Sale Rule in the Revenue Act of 1921. This established the 30-day window, forcing investors to adopt true "harvesting" strategies—either waiting 30 days or replacing the asset with a non-identical security.
3. The 1970s–1980s: Standardized Deductions and Modern Tax Code
Over subsequent tax acts—most notably the Tax Reform Acts of 1969 and 1986—regulators formalized loss limits (such as allowing up to $3,000 of net capital losses to offset ordinary income in the U.S.) and rules for carrying unused losses forward into future tax years.
4. The 2010s–Present: Automated "Tax-Loss Harvesting"
For most of the 20th century, tax-loss selling was a manual, end-of-year task handled primarily by wealth managers for high-net-worth clients. Over the last 10–15 years, the rise of robo-advisors and algorithmic trading automated the process, making continuous, year-round tax-loss harvesting accessible to everyday retail investors.
Useful Framing
"Not a New Trick": Emphasize to readers that tax-loss selling isn't a risky loop-hole or a modern crypto-era hack; it has been a core, legal element of tax planning for over 100 years.
The "Wash-Sale" Context: Explaining why the Wash-Sale Rule was created in 1921 makes for a great historical anecdote that helps readers remember the 30-day rule.
Does tax loss selling still effect market behavior late in the year, where individual stocks that have been declining all year will sell off even more during the last quarter?
Yes, tax-loss selling still significantly impacts late-year market behavior.
The phenomenon—where stocks that have struggled all year suffer extra selling pressure in October, November, and December—is well-documented in financial markets. However, the way it operates today differs from how it worked decades ago.
How Late-Year Tax Selling Drives Prices
The "Loss Momentum" Loop: When a stock declines during Q1–Q3, it becomes an obvious target for investors looking to harvest losses before December 31st to offset their gains.
As retail investors and portfolio managers start dumping these underperforming shares in Q4, the increased supply puts additional downward pressure on the stock, accelerating its decline. Institutional "Window Dressing": Mutual funds and institutional portfolio managers often engage in a related late-year practice.
They sell off their biggest losers before issuing year-end reports to shareholders so they don't have to show embarrassing, underperforming holdings on their books. The "January Effect" Rebound: Historically, these heavily beaten-down stocks often experience a rapid temporary rally in early January—known as the January Effect—once the artificial tax-selling pressure vanishes and buyers step back in to buy undervalued shares.
How the Dynamics Have Evolved Today
While the late-year dip still happens, modern markets have reshaped the trend:
Earlier Execution (The November Shift): Smart investors and algorithmic funds know everyone tries to sell losers in late December. To front-run the crowd, tax-loss harvesting now frequently peaks in October and November rather than the last week of December.
Year-Round Automated Harvesting: The rise of robo-advisors and direct-indexing platforms means tax losses are harvested algorithmically throughout the entire year whenever a stock dips, somewhat smoothing out the extreme December dumping.
Impact Concentration in Small-Caps: Large-cap, high-volume stocks (like Big Tech) absorb tax-loss selling without moving much. However, small-cap and micro-cap stocks—which have lower trading volume—still experience sharp late-year drawdowns due to tax-loss selling.
Key Takeaways
The Trap: Buying a stock just because it's down in November can be risky, as tax-loss selling can keep driving it lower through year-end.
The Opportunity: Value investors often look for high-quality companies whose fundamentals remain solid but whose stock prices were artificially crushed by Q4 tax-loss harvesting, setting up potential bargains for the new year.
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