> For the complete documentation index, see [llms.txt](https://gitbook-open-v2-preview.gitbook.workers.dev/url/gitbook.com/docs/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://gitbook-open-v2-preview.gitbook.workers.dev/url/gitbook.com/docs/help-center/account-management/pricing-plans-and-billing/why-dont-i-get-billed-for-the-advanced-ai-assistant-or-translation-add-ons-flat-fees-immediately.md).

# Why don’t I get billed for the Advanced AI Assistant or Translation add-ons flat fees immediately?

We bill for these add-ons at the end of the billing period so we can include any usage charges alongside the flat fees.

These add-ons will not appear on your bill until they are used for the first time.

The flat fees for these two add-ons include a limited number of actions:

* **Advanced AI Assistant add-on:** includes a monthly limit of successfully answered questions. If you go over that limit, GitBook continues answering questions, and we bill each additional successfully answered question as usage on your next invoice.
* **Translations add-on:** includes a set number of translated words per month, with an additional charge per 1000 translated words beyond that limit.

***

## What happens if my question limit goes over?

If you go over the monthly limit included with the Advanced AI Assistant add-on, GitBook continues answering questions.

We bill the extra successfully answered questions as overage usage at the end of the billing period.

See [our pricing page](https://www.gitbook.com/pricing) for specific limits and pricing for each add-on.


---

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