Manitoba Finance is investigating after the province revealed it might have accidentally sent six sets of business tax documents to the wrong address.

A handful of tax returns may have been included in envelopes intended for and sent to other businesses, the province said in a statement Tuesday. The documents displayed the business name, address, account number and total payroll for the company.

"Once this error was discovered, immediate action was taken to find the cause and correct it," the province said. "Manitoba Finance is directly notifying all businesses that may be affected."

The returns were for health and post-secondary education tax levy accounts. The levy applies to companies paying out more than $1.25 million to employees per year.

The province alerted the Manitoba Ombudsman of the situation, and is advising business owners who haven't received a return, or received one belonging to somebody else, to contact Manitoba Finance.

"Manitoba Finance takes the confidentiality of tax information very seriously," the province said. "The department apologizes for this error, continues to investigate and will take corrective action as recommended."

Privacy breach reporting is not mandatory in Manitoba.

Manitoba ombudsman Charlene Paquin said her office is reviewing the matter

"If any privacy concerns are brought forward to the office we will review them individually to determine if any personal information is affected," Paquin wrote in an email. "We will also continue to review the matter and follow-up with the Department."