> ## Documentation Index
> Fetch the complete documentation index at: https://docs.roomdoo.com/llms.txt
> Use this file to discover all available pages before exploring further.
# How to create invoices for a customer
> Learn how to create invoices for a customer in Roomdoo after check-out, including advance invoices, in just a few clicks.
Here's how to issue an invoice in Roomdoo:
If the check-out date has passed, the customer has paid, and no proforma has been issued yet, here's how to create the invoice in Roomdoo:
1. Open the reservation from the calendar or by reservation number.
2. Click the **Invoicing** tab → **Create invoice**.
3. If the customer is already on file, type their ID number and they appear automatically. If they're not on file or the invoice is in someone else's name, click **Customer** and fill in the fields.
4. From here you can adjust several things:
* Choose which products to remove from the invoice — those stay pending to be invoiced later.
* In the comments box, add anything extra needed on the invoice.
5. Click **Save** and the proforma invoice is issued.
6. Once the proforma is created, the **Invoicing** tab shows the proforma in a black box. At the top, a red box shows what's still pending to be invoiced.
7. While the invoice is still a proforma, Roomdoo lets you modify it, email it, and print it.
Once the invoice is issued, you **can still make certain changes** from Roomdoo using the **Modify** button on the invoice itself: change the invoiced contact, remove lines or adjust line items. When you save, the system automatically generates a **corrective**: the credit-note invoice is recorded in Odoo and the new final invoice (with a different sequence number) is the one that stays visible in Roomdoo and gets delivered to the customer.
Some changes **do require support** — for example, changing the room-night amount when the invoice was issued at the wrong price. For those cases, get in touch with our team. See [Modify invoice details](/en/invoicing/modify-invoice-details) and [Correct an invoice](/en/invoicing/correct-invoice).
8. When the check-out day arrives, opening the **Invoicing** tab shows a **Validate** button on the proforma's black box. Clicking it turns the box blue, with an invoice number attached.
The automatic validation between 22:00 and 23:00 on the check-out day **only applies if your property has auto-invoicing configured**, which is the minority of cases. Otherwise, leaving a proforma unvalidated manually can cause issues in the invoicing chronology from the next day onwards. **Always validate the proforma manually** when applicable.
## Advance invoices
Although not generally recommended, Roomdoo can also issue **advance invoices** — those issued before the check-out date.
To create an advance invoice in Roomdoo, the reservation must be paid first. Then:
* From the **Payments** tab, click the **Advance invoice** button.
* A panel opens to enter the recipient's details. Then click **Create invoice**.
* From the reservation's **Invoicing** tab, click **Create invoice** and follow the normal proforma flow.
* The proforma will show with the concept *advance payments*.
You might also be interested in our guide on [how to record a payment in Roomdoo](/en/payments/record-payment).
