Instalment invoices

A quotation is not always invoiced in one go; this often happens in instalment invoices. These can be invoices drawn up from the financial planning (in instalments / stages), or from a progress claim.

• If you do not want to show an overview of the previous instalment invoices on the invoice, you work with the simple invoice strategy. This is the most common way of working.
• In some cases it is desirable to show an overview of the previous instalment invoices on the invoice when you draw up the next instalment invoice (or the final invoice). This is done with a cumulative invoice strategy.

How instalment invoices work

Depending on the way of working, the invoice strategy works slightly differently. That is why we explain instalment invoices according to the 3 possible ways of working.

1. Invoicing in instalments / stages: you invoice from the financial planning of a quotation / project (e.g. an advance invoice)
2. Progress claims: you invoice on the basis of a progress claim
3. Combination: you combine an advance invoice with progress claims

What does the overview of instalment invoices look like?

In Robaws on the invoice

In Robaws you see a window with the previous instalment invoices appear on the invoice.
The details of this are explained per way of working.

In Robaws on the progress claim

In Robaws you see a window with the previous advance invoices appear on the progress claim.
The details of this are explained per way of working.

On the invoice (PDF)

On the invoice PDF for the customer, what can be invoiced to date is shown cumulatively, and the instalment invoices (advance invoices or progress claim invoices) are deducted from that.

Updated on: 08/09/2026