The following script enables catch up contributions to HSA over 55 years old. The HSA plan must be set up on the FSA engine for this to work.
 
In the OnLoad script:
 

if (Event.Applications["Health"] != null && Event.Applications["Health"].CoverageTypeID == 4) // employee only

{

Event.Engine.Config.SetAnnualMaximum(0, 0, 2530); // whatever the usual maximum contribution for employee only is

if (Event.Employee.EmployeePerson.Age(Event.Engine.EffectiveDate) >= 55)

Event.Engine.Config.SetAnnualMaximum(0, 0, 3530); // contribution plus the "catch up" amount

}

else // more than one

{

Event.Engine.Config.SetAnnualMaximum(0, 0, 5380);

if (Event.Employee.EmployeePerson.Age(Event.Engine.EffectiveDate) >= 55)

Event.Engine.Config.SetAnnualMaximum(0, 0, 6380);

}