How will payroll services handle Age 50 Catch-up contributions?

[John A]

Does anyone have any idea how payroll companies will be handling the age 50 catch-up contributions? Will payroll companies be collecting participants' dates of birth? Will payroll companies that currently stop deferrals at the 402(g) limit now stop deferrals for plans that use catch-up at the 402(g) plus age 50 catch-up limit? How will payroll companies identify age 50 catch-up contributions that become age 50 catch-up due to the ADP limit?