Is it a serious issue?
For tax declarations, it's usually not a problem. If your employer doesn't provide a year-end summary, tax authorities will request a letter confirming your declared income. However, missing payslips can complicate retirement benefit calculations.
What should you do?
Contact your company's HR department. Payslips are typically archived, so they can provide duplicates or a certificate detailing your annual salaries. If you've worked for multiple employers, submit requests to each one.
What if the company no longer exists?
Recovery may not be possible directly. Reach out to your pension fund—CARSAT in regions outside Île-de-France or CNAV in Île-de-France for general scheme employees. Provide the ex-employer's name, address, and ideally an employment certificate. After 3-4 weeks of archival research, you'll receive a career statement listing your gross salaries and pension contributions.