Each Fall, registered Scouts & Leaders need to pay the Membership Renewal Fee -- which was $45 in 2018. A Boys Life Magazine Subscription is optional -- the fee was still $12 per year in 2018. These Fees are collected as part of the Recharter process, then the Troop pays the money to the Council (CPC). (Then Council sends the money on to National.)
When a 'new' Scout or Leader registers mid-year, those rates are pro-rated for the number of months remaining in the current year.