How do you handle reversing monthly accruals at YE?

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I'm hoping someone here has the answer for this. We have a salary accrual that posts on the last day of the month and then reverses out the next month. When we start the next year, the expense account is $0 and the liability account holds the credit balance from the prior month/year. We can't reverse it without causing a credit balance in the expense account. How do you handle something like this?

In prior systems we had a 'month 13' that allowed us to make these reversals while keeping the balances accurate in the 'old' year and allowing the 'new' year to be correct. 

Thanks for the assist.