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Engineering· 27 May 2026
Invoicing, discounts and warranties for engineers
How to map progress invoices, agreed discounts and warranty work cleanly in project business.
By Urs Berli

In engineering, work accrues over months — with progress invoices, agreed discounts and warranty work after project completion. This is exactly where it shows whether your system thinks along with you.
Map progress invoices cleanly
Instead of issuing one large invoice at the end, you bill by progress. Vertec keeps delivered, invoiced and outstanding amounts separate per phase.
Steer discounts transparently
- Project- or line-level discounts
- Automatically reflected in reporting
- Traceable for client and controlling
Warranty work without extra effort
You record warranty work as its own, non-billable service type — the margin stays correct and the effort stays visible.