> For the complete documentation index, see [llms.txt](https://docs.20lab.app/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.20lab.app/features/unchangeable-erc-20-values.md).

# Unchangeable ERC-20 values

### Understanding ERC-20 Token Immutability

Any features you select during the token generation phase will be permanently added to the smart contract code. This is an important aspect of blockchain technology that ensures transparency and trust. Some of these features have parameters that can be modified later by the owner's wallet, but others are completely immutable once your token is deployed.

Make sure you carefully consider these settings before deploying your token, as they will be permanent for the entire lifetime of your token.

### Completely Unchangeable Values

Here are all the values that cannot be changed after your token is created (**even by a token owner**):

#### General Token Properties

* **Blockchain**: The network your token is deployed on (Ethereum, BSC, Polygon, etc.)
* **Token name**: The full name of your token (e.g., "My Project Token")
* **Token symbol**: The ticker symbol for your token (e.g., "MPT")
* **Contract name**: The identifier for your smart contract
* **Decimals**: The number of decimal places your token supports (affects how divisible your token is)
* **Total supply**: The maximum number of tokens that can ever exist (unless Mintable feature is enabled)
* **Mintable - "Max supply"**: The maximum limit for mintable tokens when mintable feature is enabled

#### Optional Features

* **Default exchange & Auto-created main LP**: The primary exchange and main liquidity pool smart contract
* **Max transaction limit types**: You cannot add new types of transaction limits after deployment

#### Tax Configuration

* **Default exchange & Auto-created main LP**: The primary exchange and main liquidity pool smart contract
* **Dividend tax - "Dividends sent in"**: The token type used for dividend distributions
* **Dividend tax - "Dividend eligibility amount"**: The minimum token amount required to receive dividends
* **Wallet taxes - "Tax names"**: The names assigned to specific wallet tax categories
* **Wallet taxes - "Wallet taxes sent in"**: The token type used for wallet tax distributions

### What Can Still Be Changed

The rest of the token values can be modified later by the owner within the same or similar limits as available in the generator. This includes adjustable parameters like tax rates, transaction limits, and other configurable features that were designed to be flexible.


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