Spending and Savings Account Conversions Mid Year on a Non-HCM Payroll client

Summary

How have you handled an acquisition where you’ve had to convert mid-year spending and savings accounts?

Content

We will need to convert their flex spending and health savings accounts sometime in March.  They are using an ADP interface not HCM Payroll.  What is the best practice in covert these balances and then continue calculation for remainder of the year?