The difference between the price expected when submitting a trade and the price actually received when it executes.
Slippage is not a separate cost for tax purposes; it is already reflected in the executed price, which is the value used for your proceeds or basis. A slippage-tolerance setting changes whether a trade executes, not how it is taxed.
No. It is embedded in the price you received, which already determines gain or loss.
Source: IRC 1001
Last reviewed September 18, 2026. Tax rules change; confirm current law before acting.
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