New on FinoLib · Volume III: Finance Encyclopedia
New on FinoLib, my finance education website: I have published an article called Disposition Effect: Why Investors Sell Winners Too Soon, from Volume III: Finance Encyclopedia. Here is what the article explains, written as a short expert briefing; the full piece, with every worked example, is one click away.
The idea in plain words
The disposition effect is selling winners too early and holding losers too long, because the price you paid becomes your reference point. In a US taxable account, this usually raises your tax bill. And in Odean’s data, the losing stocks that people kept went on to do worse than the winners they sold.
Key points
■Investors realized 14.8% of available gains but only 9.8% of available losses (Odean, 1987–1993 data).
■Winners sold beat losers kept by 3.4 percentage points over the next year.
■Raising $20,000 by selling the loser instead of the winner was worth $2,160 in the first year in the worked example.
■Watch the wash-sale rule, the one-year holding period and the $3,000 annual loss limit.
A closer look
The disposition effect, named by Hersh Shefrin and Meir Statman in 1985, is the tendency to sell winning investments too early while holding losing investments too long. It follows from the earlier chapters of this Part. The purchase price serves as the reference point (Part 6.3: Anchoring). Above it, the concave gain region of the value function makes a sure gain attractive to lock in; below it, the convex loss region makes holding on for a recovery preferable to realizing a sure loss (Part 6.2: Loss Aversion and Prospect Theory). And selling at a loss closes a mental account in the red (Part 6.6: Mental Accounting). A purely forward-looking investor would ignore the purchase price entirely, except for tax.
The table assumes current US rules, summarized in the next box; the edge cases after it show when the answer changes.
A worked example
Worked Example — Which Position to Sell When You Need $20,000
You need $20,000 of cash and own two stocks in a taxable account, each held more than a year and each now worth $20,000. Stock W cost $10,000; stock L cost $30,000. You are in the 22% ordinary income bracket and the 15% long-term capital gains bracket, with no other gains this year. Sell W (the disposition choice) Sell L (the tax-aware choice) Realized result $10,000 long-term gain $10,000 long-term loss Tax effect this year $10,000 × 15% = $1,500 owed $3,000 × 22% = $660 saved Carried forward Nothing $7,000 of loss for future years First-year difference — $1,500 + $660 = $2,160 in favor of selling L If the historical gap Odean measured held, keeping L instead of…
Decision rule
When you need cash or want to rebalance, rank positions by forward-looking prospects first. Among positions you would be equally happy to sell, sell losers before winners in taxable accounts, and avoid selling winners held a year or less unless the expected cost of waiting exceeds the tax saved. Harvest losses during the year, not only in December, and do not buy back the same or a substantially identical security within 30 days before or after the sale.
The costliest mistake
Selling the winner to raise cash while keeping the loser “until it comes back.” In the worked example that choice costs $2,160 of tax advantage in the first year, and if the historical gap between sold winners and kept losers persists, another 3.4 points of return on the position. Done every year across a portfolio, the cost compounds. Write the sell order by prospects and tax, never by which position feels like a win.
Why It Matters
In the United States the disposition effect usually works against the tax code. Gains on assets held more than one year are taxed at 0%, 15% or 20%, depending on taxable income, while gains on assets held one year or less are taxed as ordinary income. Realized losses offset gains first and then up to $3,000 a year of ordinary income ($1,500 if married filing separately), with any remainder carried forward indefinitely.
Recap
The disposition effect, selling winners and holding losers, follows from the purchase-price reference point and the shape of the value function. In a US taxable account it usually raises the tax bill, so rank sales by prospects first and use tax as the tiebreaker, minding the wash-sale rule and holding periods.
What the full article covers
The full article includes worked examples, a clear decision rule, the one mistake that costs people the most, a recap, a reveal-on-click quiz and the official sources behind every figure.
Volume III: Finance Encyclopedia
Read the full article on FinoLib
The complete article, Disposition Effect: Why Investors Sell Winners Too Soon, with every worked example, diagram, quiz and source, is free to read in Volume III, Finance Encyclopedia on finolib.com.
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