What is a capital loss
A capital loss happens when you sell an asset for less than you paid for it. The asset can be a stock, bond, mutual fund, or real estate held for investment. If you buy a stock for $1,000 and later sell it for $700, you have a $300 capital loss.
Capital loss only counts when the sale actually happens. If the price falls but you do not sell, that is just an unrealized loss. It may become a realized loss later if you decide to sell.
Why it matters
Capital losses reduce taxes when used correctly. They can offset capital gains, and sometimes they can reduce ordinary income. That makes them a tool for tax planning and risk management.
Knowing how capital losses work helps you make better choices about when to sell, when to hold, and how to report sales for taxes.
Realized versus unrealized losses
- Realized loss: You sold the asset and locked in the loss. This is the loss that counts for tax purposes.
- Unrealized loss: The asset is worth less on paper but you still hold it. No tax impact yet.
You can only use realized losses on your tax return. That is why people sometimes wait to sell until a year or more have passed. Holding longer can change the tax rate on gains and may change the timing of losses too.
Short term and long term
Tax rules often split capital gains and losses into two groups:
- Short term: Assets held one year or less. Gains or losses are taxed like ordinary income when realized.
- Long term: Assets held more than one year. Gains are usually taxed at lower rates.
When you have both gains and losses, you match short term gains with short term losses first, and long term gains with long term losses. The net results are then combined.
How taxes treat capital loss (U.S. example)
Tax laws differ by country. Here is a simple summary for U.S. federal taxes:
- Capital losses first offset capital gains of the same type.
- If losses exceed gains, up to $3,000 per year ($1,500 if married filing separately) can be used against ordinary income.
- Any unused loss can be carried forward to future years until it is used up.
Example:
- You sold stocks and took $5,000 in losses and also sold other stocks for $2,000 in gains.
- Net capital loss is $3,000.
- You can use $3,000 to offset ordinary income this year.
- If you had $6,000 in losses and $2,000 in gains, you could use $3,000 this year and carry $1,000 to next year.
Always check local rules because limits and treatment can vary.
Tax strategies: loss harvesting
Capital loss harvesting means selling investments that have lost value to realize losses for tax purposes. People do this to offset gains in the same year and reduce taxes.
Simple harvest plan:
- Identify holdings with losses.
- Check whether selling fits your investment plan.
- Avoid buying the same or a substantially identical asset within 30 days before or after the sale. This triggers the wash sale rule.
Loss harvesting is useful in high-gain years. It is not a substitute for a sensible investment strategy.
The wash sale rule
The wash sale rule prevents you from claiming a loss if you buy the same or a substantially identical security within 30 days before or after the sale. The disallowed loss is added to the cost basis of the new holding instead.
Key points:
- The rule applies to your account and accounts you control, including IRAs in some cases.
- Buying a similar ETF that tracks the same index may also be treated as substantially identical.
- If you violate the rule, you do not lose the loss forever. It shifts into the new purchase basis.
Common mistakes
- Selling only for tax reasons without thinking about the investment thesis.
- Ignoring the wash sale rule by buying back the same stock too soon.
- Assuming all losses can be used against income the same year.
- Mixing personal losses for personal items with investment losses. Losses on personal use property are usually not deductible.
Example, step by step
You bought Company X shares for $1,000. You sell them for $600. You have a $400 realized capital loss. Later that year you sold other stocks and had $200 capital gains. You use $200 of the loss to cancel the gains and then use up to $3,000 to reduce your ordinary income. The remaining $200 loss can be carried forward.
Final takeaway
A capital loss is a useful tool. It lowers taxes when you realize it and follow the rules. But it should not drive investment decisions by itself. Think about your goals, be aware of the wash sale rule, and track carried forward losses. If you are unsure about tax details, consult a tax professional because rules vary by country and can change.