Automatic theme switch, reverse charge and tax exempt invoices, Peppol support

Changelog
04 Jan 2026

Highlights

  • Expand Monthly report table: “only customer results” or “results including projects”
  • Configurable rate rounding: decimal, classic (default) see documentation
  • Dark mode is now gray instead of dark blue with better contrast
  • New Automatic option to switch between Bright and Dark theme

Videos

We are producing a video series to explain Kimai features:

Please follow us @YouTube for more updates in the future.

Absence

  • New configuration to deactivate half-day vacation bookings
  • Remove all fields except comment when editing an existing absence
  • Editing a vacation comment failed, if all holidays were taken

Invoice

  • Support for Reverse Charge and Tax exempt invoices
  • Added Customer fields:
    • Tax status (Standard, Reverse charge, Exempt)
    • Tax exemption reason (free text, required in case of Tax exempt)
  • Added Peppol profile (beta)
    • Currently supporting Vat-IDs in cbc:EndpointID
    • Limited to certain countries, please read the documentation

API

  • New API endpoint to lock months
  • Retrieve and set break time via timesheet endpoints
  • Added fields to Collection calls, to reduce the need of calling the entity endpoint
  • Query modified_after in UTC
  • Do not expose internal user preferences via API
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