Bug 510640

Summary: Okular fails to detect specific date form fields in official Dutch Tax Office PDF
Product: [Applications] okular Reporter: adrian.e.holland
Component: PDF backendAssignee: Okular developers <okular-devel>
Status: REPORTED ---    
Severity: normal    
Priority: NOR    
Version First Reported In: 24.12.3   
Target Milestone: ---   
Platform: Ubuntu   
OS: Linux   
Latest Commit: Version Fixed In:
Sentry Crash Report:
Attachments: Dutch Tax Office PDF form with some date fields not recognised by Okular

Description adrian.e.holland 2025-10-15 13:42:17 UTC 
Created attachment 185805 [details]
Dutch Tax Office PDF form with some date fields not recognised by Okular

SUMMARY
Okular does not recognize the date input fields in section 2a of the attached PDF as interactive form fields, while other viewers like Ubuntu Gnome Document Viewer version 48 do.

STEPS TO REPRODUCE
1. Open the attached PDF file (model_opgaaf_gegevens_loonheffingen vanaf 2024.pdf) in Okular.
2. When prompted, click "Show Forms" or activate form viewing.
3. Scroll to page 2, section 2a.

OBSERVED RESULT
The date fields next to "Ja, toepassen vanaf" and "Nee, niet (meer) toepassen vanaf" are not identified as form fields. They are rendered as static text boxes.

EXPECTED RESULT
The date fields should be interactive and allow the user to type in the day, month, and year.

SOFTWARE/OS VERSIONS
Okular version: 24.12.3
PDF Backend Version: 0.6.5
Poppler Version: 25.03.0
Linux/KDE Plasma: Ubuntu 25.04

ADDITIONAL INFORMATION
I installed the latest version of okular from the Ubuntu apt repository.

poppler-utils pdfinfo 'model_opgaaf_gegevens_loonheffingen vanaf 2024.pdf'
Title:           Model Opgaaf gegevens voor de loonheffingen - Vanaf 2024
Subject:         LH 008 - 2Z*11FOL
Author:          Belastingdienst
Creator:         Adobe InDesign 18.5 (Macintosh)
Producer:        Adobe PDF Library 17.0
CreationDate:    Thu Dec  7 08:57:37 2023 CET
ModDate:         Thu Dec 14 15:08:10 2023 CET
Custom Metadata: no
Metadata Stream: yes
Tagged:          yes
UserProperties:  no
Suspects:        no
Form:            AcroForm
JavaScript:      yes
Pages:           3
Encrypted:       no
Page size:       595.276 x 841.89 pts (A4)
Page rot:        0
File size:       149481 bytes
Optimized:       yes
PDF version:     1.7

model_opgaaf_gegevens_loonheffingen vanaf 2024.pdf is a PDF form from the Dutch Tax Office (Belastingdienst) that individual tax payers have to fill in relating to payroll taxes.
It can be downloaded from https://www.belastingdienst.nl/wps/wcm/connect/bldcontentnl/themaoverstijgend/programmas_en_formulieren/model_opgaaf_gegevens_voor_de_loonheffingen

An English version can be downloaded from the Dutch Tax Office https://www.belastingdienst.nl/wps/wcm/connect/bldcontenten/themaoverstijgend/applications_and_forms/model-statement-data-payroll-taxes