On-call time
On-call time is a period when a worker must remain available to respond to work outside their ordinary duties or hours.
Availability is not one legal bucket
On-call time is time when a worker must be available to respond outside their usual activity or hours. Whether the whole period counts as working time depends on what the worker must do, where they must stay and how much freedom they retain.
Time on call at the workplace normally counts towards working-time limits. Time at home may not count in full when the person can use it freely, although time actually spent responding does. Heavy restrictions on location, response time or activity can change the assessment. The Acas on-call guidance gives practical examples.
Working time, pay and minimum wage ask different questions
An employment contract should say how standby and call-outs are paid. There is no single rule that every on-call hour receives the ordinary hourly rate, but contractual pay cannot override minimum-wage entitlement for hours that count under minimum-wage law.
The GOV.UK working-time calculation and the minimum-wage hours guidance apply different tests. Check both instead of using one total for every purpose.
Record restrictions and call-outs separately
Set the on-call window, required location, response time, escalation route, pay and recovery arrangements in writing. Record each call-out with its start, finish and work done. This supports working-time, minimum-wage and payroll decisions without pretending the whole standby period is always identical.
Review the arrangement when calls become frequent or response expectations tighten. For Northern Ireland, use the separate working-time guidance.
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