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As I understand, the current amount must be showing as Credit balalnce in the "Deferred Income" Account.
When the next year comes, you will pass the following adjusting entry to bring it out of that.
Deferred Income A/c DR
TO Revenue or Income A/c
The following will help or serve as a good guidance for you http://ccba.jsu.edu/accounting/ADJENTRIES.HTML
I am sure this would help. Don't hesitate to rever for further clarification or help.