Zero-hours contract

Unlike casual work, a zero-hours contract maintains a continuous employment relationship even during periods with no work. The worker is an employee from day one, entitled to statutory rights including holiday pay and protection from discrimination. It’s common in hospitality, retail, and healthcare, where staffing needs shift week to week.

Key takeaways

• What it is: an employment arrangement where the employer guarantees no minimum hours and calls on workers only when demand exists.
• Core pattern: the contract sets no floor on hours — each shift is offered individually and the worker can accept or decline.
• Main trade-off: labor cost tracks actual demand closely, but worker income is unpredictable and retention is harder.
• Common pitfall: posting shifts too late for zero-hours workers to plan, leading to unfilled coverage and worker disengagement.

How zero-hours contracts work in practice

An employer keeps a pool of workers on zero-hours contracts and offers shifts as work becomes available. Workers can accept or decline. Some contracts include exclusivity clauses that prevent workers from taking other employment. These have been restricted or banned in several countries, including the UK.

A typical example is a restaurant where core staff cover predictable shifts and zero-hours employees fill in during busy evenings or weekend rushes. Those employees stay on the books between shifts, which is what separates them from one-off casual hires.

Zero-hours contracts vs. casual work

The key difference is continuity. A zero-hours contract keeps the employment relationship active between assignments. Casual work involves separate, standalone engagements with no implied ongoing relationship.

A retail worker who stays on the company’s books but works variable hours is on a zero-hours contract. A photographer hired for individual events has a series of separate casual engagements. The distinction affects tax treatment, employment rights, and how entitlements like sick pay or holiday accrue.

Common challenges with zero-hours contracts

For workers, income unpredictability is the main drawback. Irregular hours make budgeting and personal planning harder. For managers, the challenge is coordination: keeping track of a shifting pool of available people and distributing shifts fairly without a fixed roster to rely on.

Common questions

What is a zero-hours contract?

A zero-hours contract is an employment arrangement where the employer guarantees no minimum working hours and calls on workers only when there is actual demand.

How do zero-hours contracts affect workforce planning?

Planners depend on real-time shift posting and worker signup rather than advance rosters. Everyone sees availability instantly, which keeps coordination straightforward when active worker count changes week to week.

How Zelos helps

Zelos is a task and shift signup app with built-in messaging. Managers post open shifts and team members sign up for what suits them, with real-time availability visible to everyone without back-and-forth scheduling.