An "internal commission" token is a token that, by fundamental design, takes a percentage of commission upon transfer. In other words, every time the token is moved or swapped, a pre-determined portion of the transfer amount is either burned or sent to another address.

In many cases, these internal commission tokens have legitimate logic behind them (for example sending a portion to a burn address to create scarcity for holders); however, some "scam" tokens can also use internal commission to send funds directly to the pockets of the token creators.

To swap internal commission tokens, it is recommended to increase the slippage tolerance in swap settings, enable the "Lowest Gas" button*, and also enable "Compatibility Mode". The amount of slippage tolerance needed is different for each token, and can vary from low amounts (like 3-5%) up to 49% or even higher.

*Lowest Gas option is available in Classic Mode only

Keep in mind, 1inch network often routes through multiple liquidity pools to achieve the best rate for a swap. If an internal commission token is being swapped without the "Lowest Gas" button enabled, the commission will be taken for each pool in the route. For example, if the token has a 10% internal commission, and there are 3 pools in the route, the total commission taken will be 30%, and the slippage tolerance will need to be at least 30% as well. Enabling "Lowest Gas" mode will ensure that your swap is only routed through one pool.

***Please keep in mind, a higher slippage tolerance increases the risk of your transaction being front-run (sandwich attacked)

***If the total / combined internal commission is higher than 49%, the token cannot be swapped on 1inch.

By increasing the slippage tolerance, you are decreasing the necessary 'minimum amount returned' to compensate for the % taken out during the transfer.

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