The first deduction holiday for 2017 is already here. Because deductions for health & welfare occur 4 times per month, months with 5 pay periods produce a "deduction holiday". December 2016 had 5 Saturdays, so the first deduction holiday of 2017 will be Jan 10th. Because of open enrollment changes a higher number than usual are in "catch-up" status. See link below to FAQ - health & welfare deductions - for more details.
If you transfer from a full-time to a part-time position, you will have to pay more out-of-pocket to continue your medical coverage. Medical, vision and dental coverage are not mandatory for part-time employees. You have the option to discontinue your coverage if you become a part-time employee. You will return to the Plan as soon as The Health and Welfare office is notified of your return to full-time status.
Part-time employees can choose to pay monthly for coverage through the Health & Welfare Plan. All part-time employees (except for New Service Agreement employees and re-hired retired employees) receive long-term disability and life insurance coverage. For more information, visit the Enrollment page.