> For the complete documentation index, see [llms.txt](https://docs.wem.io/platform/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.wem.io/platform/wemreference/functions/validation/isvalidbankaccount.md).

# IsValidBankaccount

{% hint style="info" %}
The **`IsValidBankAccount()`** function checks whether the input parameter is a valid Dutch bank account format.

Note: this function only works for **Dutch Bank Accounts** and is an old (though still valid) implementation using the old account-number 11-proof checks. Still available for backwards compatibility in existing projects.

The function[ `IsValidIBAN()` ](/platform/wemreference/functions/validation/isvalidiban.md)can be used for validating IBAN account numbers.

This function is NOT SQL compatible. For more information about SQL compatibility, see our [documentation](/platform/wemreference/sql-compatibility.md).
{% endhint %}

{% hint style="success" %}
Returns <mark style="color:green;">`true`</mark> if <mark style="color:blue;">`parameter`</mark> is a valid Dutch bank account.

Returns <mark style="color:red;">`false`</mark> if <mark style="color:blue;">`parameter`</mark> is **not** a valid Dutch bank account
{% endhint %}

### Syntax

<details>

<summary><code>IsValidBankAccount(</code><mark style="color:blue;"><code>accountnr, ing</code></mark><code>)</code></summary>

`IsValidBankAccount("736160221", false)`\
*=> True*

`IsValidBankAccount("12345678", false)`\
*=> False*

</details>

### Parameters

<table><thead><tr><th width="150">Name</th><th width="150">Type</th><th width="150" align="center">Required</th><th width="284.6178790534619">Description</th><th data-hidden>Required?</th></tr></thead><tbody><tr><td><mark style="color:blue;">accountnr</mark></td><td>text</td><td align="center"><span data-gb-custom-inline data-tag="emoji" data-code="2611">☑️</span></td><td>Field that is checked for a value </td><td>yes</td></tr><tr><td><mark style="color:blue;">ing</mark></td><td>Yes/No</td><td align="center"><span data-gb-custom-inline data-tag="emoji" data-code="2611">☑️</span></td><td>True when its an ING bank account <br>False when it is not an ING bank account</td><td></td></tr></tbody></table>


---

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