PTO banking is becoming increasingly popular. Rather than offering sick-time and PTO, the days are banked into simply PTO. This negates the need for employees to "call in sick" when they really just need a day off. It also means HR doesn't need to track "doctor's notes" or proof of illness for time off. Things to consider before offering PTO banking:
Whether state laws require a certain amount of sick time.
If you employ those who require a large percentage of sick time.
Whether you'll implement "black-out days" where scheduling time-off will be restricted
If you are okay with paying remaining PTO when an employee leaves the company.
How much total time you will offer including holidays.