# Invoices

Invoices live under **Sales → Invoices**, alongside credit notes.

## The invoices list

25 invoices per page, with search and filters for **Status**, **Type** and **Overdue only**, and sortable **#**, **Customer**, **Type**, **Status**, **Issued**, **Due**, **Total** and **Open** columns.

| Column | Description |
| --- | --- |
| # | The invoice number, or **Draft** when it has none yet |
| Customer | Contact name over the email address |
| Type | **Invoice** or **Credit note** |
| Status | Status badge |
| Issued | The issue date |
| Due | The due date |
| Total | The invoice total |
| Open | What is still unpaid |

### Invoice statuses

| Status | Meaning |
| --- | --- |
| Draft | You are still writing it. No number, nothing sent. |
| Sent | The customer has it |
| Paid | Nothing is left open |
| Overdue | Sent, past its due date, and still has an open amount |
| Cancelled | You cancelled it |

Only **Draft** invoices can be edited; everything else is frozen and shows a banner explaining why — correct a sent invoice with a credit note instead. **Overdue** is not something you set: a daily sweep flips a **Sent** invoice to **Overdue** once its due date passes with an open amount still on it, and flips it back if a payment brings it current.

## Writing an invoice

### Customer and details

Pick a **Contact** the same way as on a quote, or type an **Email** and **Name** for a one-off. **Document type** picks the number series. Under **Details** you set the **Issue date**, **Service date** and **Due date**, an **Introduction** printed above the lines, and a **Footer note** printed underneath.

### Lines

Invoice lines use the same table as quotes; see [Quotes → Lines](/docs/sales/quotes#lines) for the field-by-field description. Picking a product under **From the catalog** copies its title, unit, price and VAT class onto the line; unlike a quote line, an invoice line keeps no link to the product.

## Sending an invoice

**Send** allocates the invoice's number and locks the PDF; nothing about a sent invoice can be edited afterwards, including its lines, dates or notes. **Resend email** sends the stored PDF again without changing anything. **Open PDF** opens the document that was actually sent.

## Amounts

Every invoice shows four figures: **Total** (what it was issued for), **Paid** (payments recorded against it), **Credited** (amounts taken off by credit notes), and **Open** (what is still outstanding).

## Credit notes

**Create credit note** is available on a **Sent**, **Overdue** or **Paid** invoice. It opens a draft credit note pre-filled with the negated lines and amounts, and its own number from the credit-note series when you send it. Creating a credit note does not change the original invoice's status — it stays **Sent**, **Overdue** or **Paid** — but the original gains a **Partly credited** banner naming the amount taken off, and the credit note itself shows a **Credit note** banner linking back to **View original invoice**.

A credit note cannot go negative: an invoice total can never be negative either, so a correction beyond the invoice's remaining amount is refused rather than silently clamped. A credit note also never takes payments — it is not payable, only the invoice it corrects is.

## Deleting

**Delete** only exists while the invoice (or credit note) is a **Draft**; anything sent is permanent.