# What is a memo/tag, and when is it required?

Sometimes a service gives you two things to receive crypto: an **address** and a **memo/tag**. If you forget the memo/tag, the transfer can arrive on-chain but not be credited to your account automatically.

## Why memo/tag exists

Some platforms reuse one deposit address for many users. The memo/tag is the extra identifier that tells the platform “which user this deposit belongs to”.

## When you must include it

You usually need a memo/tag when:

* You are depositing to an exchange or custodial service.
* The service shows a separate memo/tag field during deposit.
* The service explicitly says “memo required”, “tag required”, or similar.

## What happens if you omit it

The transaction can still succeed on the blockchain, but the service may not know who to credit. Recovery is sometimes possible, but it can take time, require support, and may include extra verification.

{% hint style="warning" %}
If the recipient asks for a memo/tag, always include it before confirming the transfer.
{% endhint %}

## How to avoid mistakes

* Copy the memo/tag exactly as shown.
* Double-check the network and recipient details (TON, TRON, Solana).
* If you are unsure, ask the recipient service which details are required.

## Related articles

* [What if I forgot to include a memo?](/intro/frequently-asked-questions/what-if-i-forgot-to-include-a-memo.md).
* [How to make a transfer?](/intro/transfers/how-to-make-a-transfer.md).
* [How to track a crypto transaction (TXID, status, confirmations)](/intro/transfers/how-to-track-a-crypto-transaction.md).


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