PTO vs Vacation vs Sick Leave
The words get used loosely. The policies cannot afford to. What each term covers, what comes off the allowance, and why sickness gets its own column.
Last reviewed 17 Aug 2026
The words, and what people mean by them
Paid time off, or PTO, is the American umbrella term for paid leave of any kind. Vacation is time off taken by choice and planned in advance. Sick leave is time off because somebody is unwell, which nobody plans. Outside the United States the vocabulary shifts: annual leave or holiday in place of vacation, with sick leave keeping its name.
The confusion is not really about the words. It is that PTO describes two different structures. In some companies PTO is one pooled bank covering everything. In others it is the name of the vacation bank while sickness sits beside it. Ask which one somebody means before answering a question about a balance.
One bank or several
The consolidated bank
One number covers vacation, sickness and personal days. The employee decides what to spend it on and nobody has to give a reason. It is simple to administer, it treats adults as adults, and it removes any incentive to describe a holiday as a sick day.
The cost is that sickness competes with holiday. Somebody with a bad winter loses the trip they were saving for, and somebody ill with three days left comes to work anyway. It also complicates compliance where paid sick time is mandated separately, because a pooled bank has to be shown to meet that minimum on its own.
Separate buckets
Vacation, sickness and anything else each hold their own count. It costs slightly more setup and it makes the sickness pattern visible, which is the point. A person's holiday stops depending on their health.
What actually comes off the allowance
The useful question about any leave type is not what it is called. It is whether it reduces the vacation allowance. That single switch decides how everything else behaves.
| Leave type | Comes off the vacation allowance | Notice expected | Usually tracked on its own |
|---|---|---|---|
| Vacation or annual leave | Yes | Yes | No |
| Sick leave | Usually not | None possible | Yes |
| Public holiday | No | Not applicable | Yes |
| Bereavement | Usually not | None possible | Yes |
| Jury service | No | When the summons arrives | Yes |
| Parental leave | No | Yes | Yes |
| Unpaid leave | No | Yes | Yes |
Every row still needs recording. A leave type that does not deduct is not a type you can ignore: somebody is still not at work, it still counts toward whether the team has cover that day, and it still belongs in the record you may need later.
Why sickness is usually tracked separately
Three reasons, and none of them is suspicion.
- Balances stay honest. Sickness is not a choice, so charging it against a holiday allowance means somebody's ability to take a break depends on how healthy their year was.
- Patterns become visible. Six single days spread across a year read as nothing in a month by month view and read as a conversation worth having when the whole year sits on one line. That conversation might be about a chronic condition, a caring responsibility or a workload, and none of those improve for being invisible.
- Compliance is easier. Where paid sick time is mandated, being able to show sick days on their own is the difference between a five minute answer and an afternoon of reconstruction.
Sensitivity cuts the other way too. Sickness records are among the more personal things an employer holds. Keep the detail out of any shared calendar, keep the diagnosis out of the record entirely, and limit who can see the pattern. Everything in this site's tracker stays in the browser it was entered in, which is one way to keep that circle small. The sick leave tracker is the same tool with sickness already set up as a non deducting type.
The other categories worth having
Most companies end up with more than three. Bereavement, jury service, parental leave, unpaid leave, study or exam days, and a compassionate category for the situations nothing else fits. Each one needs three decisions and no more: a name, whether it deducts, and who approves it.
Resist the urge to invent a type for every situation. A dozen categories nobody can remember produces worse data than five people use correctly. Add a type when the existing ones force somebody to record something dishonestly, and not before.
Setting it up so the numbers stay right
Whatever tool you use, the setup is the same. Create one leave type per category. Turn the deduction switch on for vacation and off for everything else, unless your policy genuinely charges sickness to the allowance. Give each type its own colour so a year reads at a glance. Then keep public holidays out of the day counts entirely, because a week off across a public holiday costs four days, not five.
If you run a single pooled bank instead, one type deducts and the rest are labels on it. That works too, and the guides on accrual methods and carryover apply to a pooled bank exactly as they do to a vacation only one.