Percentage fee built into the token contract. Fires automatically on every buy or sell. No opt out. No routing around it. Just gone before the transaction completes.

5% sell tax. Sell $1,000. Receive $950. The other $50 went somewhere in the contract. Developer wallet. Marketing fund. Liquidity pool. Burn address. Whatever the deployer decided when they wrote the code.

BSC in 2021 made this wildly popular. Every second token launched with 10/10 tax marketed as revolutionary tokenomics. Sustainable ecosystem funding. The future of DeFi.

Mostly it was just a mechanism to collect 10% of every transaction into a wallet the developer controlled. Framed differently.

The Math Nobody Does Before Buying

10% buy tax plus 10% sell tax. Common structure. Sounds manageable individually.

Buy $1,000 of tokens. Effectively receive $900 worth at market price. Already behind before the chart moves at all.

Token needs to rise 11% just to break even on the buy tax alone. Then sell tax takes another 10% on exit. Need roughly 22% gain to walk away flat.

That's the actual cost of participating. Most people don't calculate it. They see the chart moving, buy, and discover the math later when they try to exit and receive less than expected.

High tax tokens rarely sustain momentum for this reason. Every new buyer immediately underwater. Trading dies. Price drifts. The only people who did well were the developer collecting tax on every transaction and whoever sold to the last round of buyers.

Where It Goes

Contract designates recipient addresses at deployment. Common destinations:

Auto-liquidity. Portion of tax adds to the pool automatically. Theoretically stabilizes the token. In practice the developer usually controls the LP anyway so this is circular.

Developer or treasury wallet. Direct collection. No lock. No vesting. Immediately accessible. Funds operations supposedly. No accountability mechanism ensuring that.

Reflection. Tax redistributed proportionally to all holders. Passive income for holding. Requires massive constant volume to generate anything meaningful. Most reflection tokens generated negligible amounts while the chart slowly died.

Burn. Tokens to a dead address. Only meaningful at significant volume and tax rates simultaneously. Mostly marketing.

The Changeable Tax Is the Real Problem

Token launches 5/5. Scanners show acceptable rates. Looks fine. People buy.

Buried in the contract: a function letting the owner change the tax rate at any time. No timelock. No limit on how high it can go.

Owner waits. Volume builds. Enough holders accumulated. Then changes sell tax to 90%.

Buying still works fine. Selling now costs 90% of the transaction value. Nobody exits profitably. Everybody trapped. Developer keeps collecting on whatever buying still trickles in from people who didn't notice.

Technically selling is still possible. Functionally identical to a honeypot because no rational person accepts a 90% loss voluntarily. Same outcome. Different legal framing.

TokenSniffer and Rugcheck flag modifiable tax functions. If the rate can be changed by the owner, assume at some point it will be. That's the only reasonable assumption given the incentive structure.

How to Check

Honeypot.is simulates both a buy and a sell. Shows effective tax rate on each side. Literally takes ten seconds and has saved people real money.

DEXScreener displays tax rates directly on token pages for most chains.

Rugcheck on Solana flags high or modifiable taxes as part of standard scan.

Zero tax on a renounced contract is the cleanest outcome. Tax present with modifiable function and unrenounced contract is a loaded gun pointed at holders.