Hide or remove invoice number on invoice.
Allow hiding or removal of invoice number on the invoice so that customers cannot determine how many customers you have had since their last invoice. This would be ideal for small or part-time businesses that do not handle a lot of volume.
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Jamie commented
This is an interesting idea that I don't think I've ever seen discussed before. I agree that it would be valuable for small businesses operating in industries in which their smallness might not be an asset. Another possibility is to use a custom invoicing scheme in which the invoice number is specific to the customer (e.g. XYZ-001, XYZ-002) so that the client would only know where the invoice stood in relation to others he or she had received.