What is an Unrealized Gain or Loss?
An unrealized gain or loss is the difference between an investment's current market value and its purchase price while you still hold the position. If you bought shares at $50 and they now trade at $70, you have a $20 per share unrealized gain. It becomes a realized gain only when you sell. Until then, it is a paper profit that can grow or shrink with market movements and has no tax consequences.
How Unrealized Gains Distort Decisions
Behavioral finance research shows that investors tend to sell winners too early to lock in gains and hold losers too long to avoid admitting mistakes. This disposition effect leads to suboptimal portfolios where winning positions are cut short while losing positions accumulate. The purchase price is a sunk cost that should be irrelevant to forward-looking investment decisions, yet it powerfully anchors investor behavior.
Managing Unrealized Positions Rationally
Ask yourself: would I buy this investment today at its current price? If not, the rational action is to sell regardless of whether you have a gain or loss. For tax planning, strategically realizing losses at year-end to offset gains (tax-loss harvesting) can reduce your tax bill. Conversely, deferring the realization of gains allows continued compounding without tax drag, which is one of the most powerful advantages of long-term investing.