Managing invoice numbers is only available to customers on the paid plan.
When you create a new invoice, Sage Sole Trader assigns the next number in your sequence.
You can change what that number will be. For example, if you're moving from another system and want your invoices to continue from where they left off.
You can only set a number higher than your last invoice number. This prevents duplicate invoice numbers in your records.
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Go to Settings.
Select Customise invoices.
Select the Next invoice number tab.
Enter the number you want to use for your next invoice.
Select Save.
Your next invoice uses the number you entered. Sage continues the sequence from there.