Sauber have confirmed to Sky Sports that the team haven't paid their staff in full for the month of February.
The cash-strapped squad are regularly the subject of speculation surrounding their financial health and along with Force India have complained to the European Union about F1's prize money distribution.
Swiss newspaper Blick quoted team principal Monisha Kalternborn as saying: "Part of the February salaries is pending. I regret that immensely
"We are currently at the most expensive time of the year. And with the transfer of a large amount sponsorship from abroad, there has been remittance technical problems."
Sauber are due to field Swede Marcus Ericsson and Brazilian Felipe Nasr in 2016, both of whom are reported to bring millions in sponsorship to the team.
The first race of the 2016 F1 season, the Australian GP, is exclusively live on Sky Sports F1. The race in Melbourne starts at 5am on Sunday March 20.