How to invoice hours worked faster: from timesheet to invoice in one day
Most companies that bill by the hour don't lose money on the work. They lose it in the time between month end and the invoice going out. Here is where that time goes and how to shorten it.
Assembly firm, staffing agency or field service company: they all earn money only when the client pays for the hours worked. Yet between the last day of the month and the invoice going out, two or three weeks often pass. Nobody is slacking. The time disappears into paper timesheets, retyping, checking and back-and-forth.
This article shows exactly where the days go, what that costs, and how to rebuild the process so the invoice can go out on the same day the client approves the hours.
Where the time goes between month end and invoice
Follow one hour of work on its way to an invoice. In most companies with field teams, the path looks roughly like this:
- The worker writes down hours on paper, in a phone spreadsheet or sends them via WhatsApp.
- The supervisor collects the sheets, often only at the end of the week or month.
- The office retypes them into Excel or the payroll and invoicing system.
- The timesheets go to the client, usually by email as a spreadsheet or scan.
- The client checks them, questions some hours, and an email exchange begins.
- The office corrects the data and only then issues the invoice.
Each step is short on its own. The problem is the waiting in between. And when a discrepancy appears, the whole loop starts again.
What a late invoice costs
Cash arrives later. If you invoice €120,000 a month and the invoice goes out ten days later than it could, you permanently have around €40,000 sitting with your clients instead of in your account. You finance that yourself.
The office retypes data. The hours spent retyping and checking timesheets repeat every month.
Some hours never get billed. A lost paper sheet, a disputed hour you'd rather drop, extra work nobody recorded. You paid the wages anyway.
A simple calculation for your company: take your average monthly invoicing, divide by 30 and multiply by the number of days your invoice goes out later than it could. The result is what you permanently lend to your clients.
The principle: a single source of truth
Fast invoicing doesn't mean the office works faster. It means an hour is recorded once and is then only approved, never retyped. Three rules apply:
- The person who worked the hours records them, on the day they worked them.
- The client approves the entries themselves, not a copy in a spreadsheet or PDF.
- The invoice is created from approved entries, not from manually assembled paperwork.
Step by step
1. Recording on the day of work
The worker logs hours on the phone, either manually or by clocking in and out with one tap. If location is captured, there is no later debate about whether someone was really on site. Recording must take seconds, not minutes.
2. Continuous checks instead of a month-end check
The supervisor sees the crew's hours continuously and fixes mistakes immediately. Every correction is logged.
3. Client approval inside the system
Instead of emailing spreadsheets, the client gets access to their own portal. They see the hours for their job and can approve each entry or dispute it with a comment. Disputed hours are resolved individually and don't hold up the rest.
4. Period locking
After approval, the period is locked. The invoice and payroll are then based on the same agreed numbers.
5. Invoice from approved hours
The invoice is created directly from approved entries. If the client approves the hours on Tuesday afternoon, the invoice can go out on Tuesday.
Common objections
"Our people won't enter anything on a phone." Resistance rarely comes from technology, it comes from complexity. If logging time is one tap in their own language, even people who only use WhatsApp will adopt it. Start with one crew.
"The client won't want another system." The client checks the hours today too, just more slowly. A portal with nothing to install saves them time, because they see only their own job.
"We have accounting software." It stays. Fast invoicing covers everything before the invoice. Finished invoices go to your accountant as before; direct connectors to SevDesk and POHODA are in preparation.
How to know it's working
Measure one number: days from the last day of the month to the last invoice sent for that month. Track disputed hours and office time spent preparing invoices alongside it.
How MyAgent helps
MyAgent is built on exactly this principle. Workers log hours on their phone manually or by clocking in and out, including location. The client approves or disputes them with a comment in their portal. After month end the administrator locks the period and the invoice is created from approved hours. Every change is recorded in the audit trail.
And if you'd rather not click, just tell the voice assistant: "Prepare the invoice for Cologne from the approved hours." It will ask before sending.
Summary
- The time before invoicing is eaten by waiting between steps, not by the work itself.
- Late invoices mean cash at your clients, retyping and unbilled hours.
- The fix is a single source of truth: record on the day, approve per entry, invoice from approved data.
- Measure the days from month end to the last invoice.
Want to see it with your own data?
We'll show you MyAgent at your office, at ours or on a video call.