Invoicing by hand, delivery note by delivery note: where the time goes

15/09/2026

In a lot of small businesses, an invoice doesn’t start in the invoicing software: it starts as a paper delivery note, an order jotted down by hand, or an email from a customer confirming what they want. Someone has to turn that into an actual invoice. They open the management system, find the matching delivery note or order, copy over the customer, the lines, the quantities and the price, and produce a document that has to be numbered without skipping or repeating a number. Then it has to be sent, almost always by email, and a copy filed wherever it belongs: a folder in the software, a binder split by month, or both just in case.

None of this is hard to do once. It gets expensive because it happens in batches and repeats week after week: delivery notes pile up until Friday, or until someone says it’s time to invoice, and then invoices get issued one after another for an hour or two. That time doesn’t show up anywhere as “the cost of invoicing”: it shows up as a busy afternoon, which is exactly where it disappears from view.

Why invoicing by hand costs more than it looks

The first cost is copying: the data was already on the delivery note or the order, and invoicing by hand means writing it again somewhere else, with the risk that a digit changes on the way. The second is numbering: someone needs to know what the last invoice number was so nothing gets duplicated or skipped, and if two people invoice on the same day, somebody has to coordinate who numbers what before they start. The third is correcting: when a tax ID, an address or an amount doesn’t match what the customer expected, the invoice gets cancelled, redone and resent, and someone has to remember to flag that the previous one no longer counts. The fourth is searching, at month-end or quarter-end, for one specific invoice that got filed under a different name than the one whoever is looking for it expects.

None of these four steps shows up in any report. They all add minutes, and the minutes, multiplied by a year’s worth of invoices, are the figure almost nobody has stopped to work out.

The four figures for invoicing by hand

Here a case is one complete invoice: from finding the delivery note or order to the document being sent and filed. The frequency is usually weekly — invoicing happens in a batch, not one at a time as each order comes in — and the duration hides as much in the final check as in typing the data: confirming the amount matches the delivery note before sending is part of the minute each invoice costs.

Say a small business invoices once a week: 15 invoices each time, 7 minutes per invoice — copying the data, numbering it, generating the PDF, sending it and filing it — with someone whose hour costs €22. That’s 780 invoices a year, 91 hours, and around €2,002 a year.

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What gets automated first in invoicing, and what doesn’t

The first thing to automate is the copying: if the delivery note or order already exists as data, not just as paper or a stray email, an integration with the management system can fill in the invoice on its own, and a template handles the layout, the PDF and the email. Numbering stops being a problem the moment the system assigns it instead of a person checking what the last invoice was.

What still needs judgment is the exception: the customer who asks for different payment terms than usual, the discount that isn’t in any price list, the delivery note that doesn’t quite match the original order and someone has to decide whether to invoice it as is or stop and ask first. That doesn’t get automated first, and in a good few cases it shouldn’t be automated at all: it’s where something gets decided, not where a figure gets copied from one place to another.

What we won’t tell you about invoicing by hand

What’s most often missing here isn’t the hourly cost, which is almost always known: it’s how many invoices actually get issued. When the person invoicing has other tasks mixed into the same day, “we invoice on Fridays” doesn’t say whether that’s eight invoices or twenty-five, and without that number the annual cost comes out as not estimable, with that exact question written next to it. We don’t fill the gap with an average volume: if you don’t know it precisely, the figure waits for you to count it, even if that just means checking how many invoices went out last month in the software itself.

If this is how you invoice, describe it in Handmetric the way you’d explain it to someone new: what triggers it, which software you use, how many invoices go out a week. Describe your process.