Invoice digitisation projects are usually justified by removing paper and are worth doing for something else entirely. An image in a folder is a scanned filing cabinet. What earns the effort is the structured record around it: when it arrived, what it was checked against, who approved it, and what it was paid against, all searchable and reportable.
What the image alone gives you
Space saved and remote access. Both real and both modest. If the project stops here you have a searchable archive and the same process, which is worth something and considerably less than the effort usually spent getting there. Most disappointment with digitisation projects is this outcome.
What the record gives you
The received date, so payment terms are real. Status and age, so stuck invoices are visible. The match result and exception reason, so patterns can be counted. The approval with a name and a date, so the trail survives a departure. And the payment allocation, so supplier queries are answered in seconds.
Which means designing the record first
Decide what an invoice record holds and which statuses exist before choosing scanning equipment. Teams that start with the scanner produce images with nowhere useful to go and end up with a tracking spreadsheet alongside, which disagrees with the images within a month and is the most common digitisation outcome.
Questions people ask about invoice digitization
Should we digitise historical invoices?
Rarely worth it. Scan on demand when an old document is actually needed and spend the effort on current flow.
Can we keep the paper too?
Until you are confident the digital copy is complete and legible, and thereafter according to your retention policy.
What is the minimum useful record?
Supplier, amount, dates, status, owner and the document attached. That alone replaces a shared mailbox and a spreadsheet.