Specialty chemicals group Clariant has launched an investigation into accounting issues and has therefore postponed its annual financial statements.

The review is about the booking of provisions and accruals in the budget years 2020 and 2021, as the Swiss company announced on Monday.

Clariant is examining whether employees have posted the provisions and accruals incorrectly in order to steer the company's results in such a way that financial targets are met.

The trigger for the now well-advanced review by Deloitte and Gibson, Dunn & Crutcher was information from internal whistleblowers.

As a result of the investigation, Clariant may be forced to adjust previously released financial reports, it said.

The publication of the annual financial statements will be postponed.

According to preliminary figures, sales from continuing operations in 2021 increased by 15 percent in local currencies to CHF 4.372 billion.

The operating margin (Ebitda) should be between 16 and 17 percent.