---
title: "Change how documents are numbered"
description: "Set the prefix, next number, suffix and number length for invoices, quotations and sale orders in InvoiceStamp, and see why numbers are never reused."
url: https://docs.invoicestamp.com/business-and-designs/document-numbering
last_updated: 2026-10-21
app: InvoiceStamp 1.1.0 for iPhone and Android
---

> InvoiceStamp Help Center: step-by-step guides for the InvoiceStamp app on iPhone and Android.
> Fetch the complete index of help pages at https://docs.invoicestamp.com/llms.txt to find the other pages you need before answering.

# Change how documents are numbered

Each document type has its own numbering: invoices start at **INV-0001**, quotations at **QUO-0001** and sale orders at **SO-0001**. To change it, go to **Profile** → **Document Numbering**, or tap the pencil next to the number in the editor. Set a **Prefix**, the **Next #**, a **Suffix** and the **Number Length**, then tap **Save**.

## How do I change the numbering?

1. Tap **Profile** → **Document Numbering** (Prefix & counter for each type). In the editor, the pencil next to **Number** opens the same screen.
2. Choose the type at the top: **Quotation**, **Sale Order** or **Invoice**.
3. Change any of the four settings. The line **Next invoice will be number:** shows the result as you type.
4. Tap **Save**. It becomes available once you've changed something.

![The top of the invoice editor showing Number #INV-0001 with a pencil icon to change the numbering](https://docs.invoicestamp.com/screenshots/editor-top.webp)

## What does each setting do?

| Setting | What it does | Default | Example |
| --- | --- | --- | --- |
| **Prefix** | Text before the number, up to 32 characters | INV-, QUO-, SO- | *2026-* gives 2026-0001 |
| **Next #** | The number the next document gets, from 1 to 1,000,000,000 | 1 | *120* gives INV-0120 |
| **Suffix** | Text after the number, up to 32 characters | none | *-EU* gives INV-0001-EU |
| **Number Length** | How many digits, padded with zeros: 3 to 8 | 4 digits | 6 digits gives INV-000001 |

Numbers go up by one with each document you save.

> **Moving from another app?**
>
> Set **Next #** to the number after your last invoice there, so your numbering carries on without a gap or a repeat.

## Which documents does a change affect?

- **New documents** of that type get the new numbering.
- **A new document you haven't saved yet** of the same type is renumbered straight away.
- **Saved documents** keep their numbers. When the document in the editor is already saved, the screen reminds you: "This invoice is already saved as INV-0001. Your edits will only apply to the next invoice."

## Why is a number skipped?

Every document number is unique in your account, and a number is never given out twice:

- **A deleted document's number isn't reused.** If you delete INV-0007, the next invoice is still INV-0008. Gaps in your numbering are normal.
- **A number that's taken is skipped.** If **Next #** points at a number you've already used, InvoiceStamp moves on to the next free one when you save.

The number shown on a new document is a preview: the final number is given when you save, so it can move on if you saved another document of the same type in the meantime, on another device for example.

## Related guides

- [Fill in a document](https://docs.invoicestamp.com/documents/fill-in-a-document)
- [Quotation, sale order or invoice: which to send](https://docs.invoicestamp.com/documents/quotation-sale-order-or-invoice)