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QuickBooks automatically assigns numbers to your sales forms starting with 1001. If you would rather use your own numbering format, you can customize the number to whatever you prefer. 

Use the  Custom transaction numbers feature to set your own numbering preference. This adds an  Invoice no. field where you can enter any number or letter format you want. QuickBooks then automatically sequences your invoices based on the number you entered in this field.
  1. From your dashboard select the Gear icon, then Account and Settings (or Company Settings).
  2. Select Sales, then click anywhere within the Sales form content section. 
  3. Check the box next to Custom transaction numbers
  4. Select Save and then Done.
  5. Open an invoice or any sales form, and in the Invoice no. field, enter the custom number or letter sequence you want to use for your forms. The sequence you set here applies to all sales forms. 
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Tip: Once you have set up your custom invoice numbering, you can turn off the Custom transaction numbers feature which can help prevent accidental changes to your numbering. Turning this feature off only means the Invoice no. field is hidden from your sales form. Invoice numbers are still printed for your customers.