# Standard message trailer

The [FIX 4.4](https://www.onixs.biz/fix-dictionary/4.4/index.html) Standard Message Trailer is a set of fields that appears at the end of every FIX message.

It contains the three-digit character representation of the Checksum value to ensure the integrity and validity of the message.

| Tag      | Name                | Type        | Required                                   | Description                                                                                                                                                                                                                                                                                                       |
| -------- | ------------------- | ----------- | ------------------------------------------ | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| **10**   | `CheckSum`          | `String`    | **yes**                                    | Three-character value representing the checksum of the entire message, including all header, body, and trailer fields. <br/><br/>The checksum is calculated by summing the ASCII values of all characters in the message and taking the result modulo 256. <br/><br/> Must always be **last** field in message.   |

For more details, see [`FIX 4.4 : StandardTrailer` in the FIX 4.4 documentation](https://www.onixs.biz/fix-dictionary/4.4/compBlock_StandardTrailer.html).