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Set up invoice numbering

Choose how Atto numbers new invoices and set the prefix and starting sequence used across your account.

Open the settings

  1. Open Settings.

  2. Select Invoicing.

Choose an invoice-numbering method

Under Invoice Numbering, select Type, then choose:

  • Sequential Per Customer — Atto assigns each Customer a unique prefix and separate sequence.

  • Sequentially Across Account — all invoices share one continuous sequence with the prefix you set.

Tap Select to apply your choice.

Set an account-wide prefix and sequence

If you selected Sequentially Across Account:

  1. Select the edit control next to Invoice Prefix.

  2. Enter a prefix containing 3–12 letters or numbers.

  3. Set the value under Next Invoice Sequence.

The prefix appears before future invoice numbers, and future invoices continue in order from the sequence you set.

Save your changes

Review the numbering settings, then select Save.

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