> For the complete documentation index, see [llms.txt](https://legacydocs.nexudus.com/platform/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://legacydocs.nexudus.com/platform/settings/billing-and-accounting/locked-period.md).

# Locked Period

Use these settings to prevent changes being made to invoices or payments that took place before a specific date.

### **Setting up a locked period**

{% hint style="info" %}
Locking a period will not prevent allocating new payments towards an invoice, as long as those payments have a date that is not within the locked period.
{% endhint %}

1. If the side menu is not visible, click ![](https://firebasestorage.googleapis.com/v0/b/gitbook-28427.appspot.com/o/assets%2F-LZFtxNPXnGfu3w0vzug%2F-LZnHZcwRtI7qlwNULS9%2F-LZnQv0ujZjL-QaAncT0%2Fhamburguer.svg?alt=media\&token=dd00faf3-6ca6-42f1-a90d-12bb2fa27021)
2. In the side menu, click [**Settings**](https://platform.nexudus.com/settings).
3. Click [**Billing and accounting**](https://platform.nexudus.com/settings/billing).
4. Click **Locked period**.
5. In the **Locked dates** section, set the lock date. All invoices and payments made before this date will be locked.
6. Click **Save changes**.

![Settings for locking dates on invoices](https://3743897482-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2F-Lbh_u87wC7EAH8sHaxc%2F-LiOrD3R8YuW3qddlIpS%2F-LiOrFGlk3M9RpTMOSxH%2Fsettings_locked_period.png?alt=media\&token=0af5562e-b714-4a71-ae4b-2968c4ce0bf8)