Only disability insurance is in arrears. See UCnet Employee Health and Welfare Benefits.
On page 24 of the Group Insurance Regulations it states:
- Premiums for Medical Plans, Dental Plan, Vision Plan, Legal Insurance, Life Insurance, AD&D Insurance, and Supplemental Health Plans are paid in advance. Premiums for Disability insurance are paid in arrears. Premiums are paid for a full month, even if coverage stops before the end of the period. Eligible Employee contributions are made through payroll deduction or direct pay.
Benefits Summary can be found at: Benefits > Review Employee Benefits > Benefits Summary
Review the benefits deduction schedule to see when these deductions occur.