# Burn Position (/docs/protocols/v4/guides/managing-liquidity/burn-liquidity)

Burn an existing Uniswap v4 liquidity position and withdraw underlying assets.

## Context
To liquidate a position, the *burn* functionality can be invoked.
The funds in the position will be withdrawn and
all the information of the underlying token will be cleared.
Burning the position is a cost effective way to
exit as a liquidity provider.

## Setup
See the [setup guide](/docs/protocols/v4/guides/managing-liquidity/getting-started)

## Guide
Below is a step-by-step guide to burn a position.

## 1. Import and define IPositionManager
```solidity
import {IPositionManager} from "v4-periphery/src/interfaces/IPositionManager.sol";

// inside a contract, test, or foundry script:
IPositionManager posm = IPositionManager(<address>);
```

## 2. Encode actions
To burn a position, two actions are required:

* burn operation - clears position entirely, withdrawing funds
* take pair - sends withdrawn funds to the recipient

```solidity
import {Actions} from "v4-periphery/src/libraries/Actions.sol";

bytes memory actions = abi.encodePacked(uint8(Actions.BURN_POSITION), uint8(Actions.TAKE_PAIR));
```

## 3. Encode parameters
```solidity
bytes[] memory params = new bytes[](2);
```

The `BURN_POSITION` action requires the following parameters:

| Parameter    | Type      | Description                                                                   |
| ------------ | --------- | ----------------------------------------------------------------------------- |
| `tokenId`    | *uint256* | position identifier                                                           |
| `amount0Min` | *uint128* | the minimum amount of currency0 liquidity msg.sender is expecting to get back |
| `amount1Min` | *uint128* | the minimum amount of currency1 liquidity msg.sender is expecting to get back |
| `hookData`   | *bytes*   | arbitrary data that will be forwarded to hook functions                       |

```solidity
params[0] = abi.encode(tokenId, amount0Min, amount1Min, hookData);
```

The `TAKE_PAIR` action requires the following parameters:

| Parameter   | Type       | Description                          |
| ----------- | ---------- | ------------------------------------ |
| `currency0` | *Currency* | first token currency                 |
| `currency1` | *Currency* | second token currency                |
| `recipient` | *address*  | address that will receive the tokens |

```solidity
params[1] = abi.encode(currency0, currency1, recipient);
```

## 4. Submit call
The entrypoint for all liquidity operations is `modifyLiquidities()`

```solidity
uint256 deadline = block.timestamp + 60;

posm.modifyLiquidities(
    abi.encode(actions, params),
    deadline
);
```