An on-call list is your last line of defense against being short-staffed. Most managers have one. Very few have one that works.
The typical version: a mental list of three people you "know" will pick up. You call the first one. They don't answer. You call the second. They're busy. You end up working the shift yourself or opening short.
A real on-call system is more deliberate than that.
Separate on-call from open shifts
These are two different things. An open shift is a gap you're trying to fill in advance, ideally 24+ hours out. An on-call list is for same-day emergencies — a callout two hours before the shift starts.
Conflating them leads to burnout. Employees who are perpetually available for last-minute calls without structure will eventually stop answering.
Pay for on-call time (or offer something)
If you're asking employees to hold themselves available on their day off, that's labor. Some states legally require on-call pay. Even where they don't, it's worth offering something — a flat guarantee, priority for desirable shifts, or first access to open shifts that week.
Unpaid, unacknowledged on-call status is a fast road to resentment. People who feel taken advantage of stop picking up.
Rotate the on-call list
Don't rely on the same two people every weekend. Build a rotation so the burden is distributed. If you have eight employees, each person is on-call about once every two months — manageable for everyone.
Publish the rotation the same way you publish the schedule. When employees know in advance when they're on-call, they can plan around it instead of being surprised by a 7 AM text.
Define what "on-call" means clearly
Ambiguity is the enemy. Your on-call employees should know:
- How much notice you'll give before calling them in
- How long they have to confirm or decline
- What happens if they can't make it
- What the compensation looks like
Write it down. A one-paragraph on-call policy posted somewhere visible is worth more than a verbal understanding.
Keep the list current
An on-call list full of people who've moved to part-time, left for school, or mentally checked out is worse than no list — it gives you false confidence. Review and update it monthly.
Also track response rates. If someone consistently doesn't answer when called, they're not actually on-call in any useful sense. Replace them with someone who is.
Have a second tier
Your primary on-call person can't always come in. Have a second tier — a shorter list of people you'd call if the first list fails. This tier might include employees who've historically been flexible, former employees you're still on good terms with, or managers who can cover in a true emergency.
Two tiers means you've thought past the optimistic scenario.
ShiftsLine lets you designate on-call employees, track their availability, and send shift alerts directly from the app. Join the waitlist.