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How to Create or Edit an Invoice Series?

Keeping your invoice series in order is essential for accurate bookkeeping, smooth tax reporting and a professional business image. Learn how to create invoice series in Invoice123 with our guide, tailored for freelancers, VAT payers, e-commerce owners and more.

Simplify your accounting process and ensure smooth financial management with Invoice123. Let's get started!

How to do it?

Select SETTINGS in the menu bar

Select SERIAL AND REFERENCE NUMBER in the sidebar

Edit/delete existing series or add new ones

Each invoice type requires a separate series

Click ADD ADDITIONAL REFERENCE NUMBER, select the reference number type from the list, enter a unique series and save it

In the Reference number field, enter the letters or other symbols you want. This part of the series does not change!In the Template field, enter as many % symbols as the number of digits the series should have.

Each series must be UNIQUE – otherwise it will not be saved

To make it even easier!

You can also add and edit series in the invoice creation window

After selecting the appropriate document name on the left, the created series will be shown in the series section. Click the lock icon to edit the next invoice number.

Updated on: 09/11/2026

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