# Lock a period

Admins can lock an accounting period to freeze it while it's under review or after it's been finalized.

![Screenshot from Lock a period](https://vaffozzswoq4jjsz.public.blob.vercel-storage.com/help-center/c64b65d8-3a0c-468e-bed6-fc0bc339ab6d/lock-a-period-1.png)

#### Locking a period (Admin Period lock)

Admins can lock an accounting period to freeze it while it's under review or after it's been finalized. Locking a period prevents **everyone** at your company from editing it, so your numbers can't change out from under a review.

This is separate from the [automatic locking of the ticketing system data](/help-center/asc/ticket-inclusion-rules)**.** Automatic locking freezes *historical ticket data* as it was synced. The period lock is an additional deliberate action an admin can take to freeze user-edits of a period.

**To lock a period**

1. Go to the **ASC 350-40 → Documents** page.
1. Select the period you want to lock.
1. In the **Lock period** card, choose **Locked**.
1. Confirm in the dialog. The lock takes effect immediately.

**What happens when a period is locked**

- The **Projects** and **ASC 350-40 Cost** pages become **read-only** for the locked period, for all users.
- **Document generation and exports keep working** — you can still produce your ASC 350-40 documents from a locked period.
- Only an admin can unlock the period. Unlocking takes effect immediately and restores editing.

**Locking and multi-month periods**

Locks are tracked per month. If you're viewing a quarter, half-year, or full year, that period shows as **Locked** whenever any month inside it is locked. To edit a month that's still open, select that single month. A note on the card tells you which months in the current period are still open.

> Only admins can control the lock.