Comparison · Employment · 2026
Zero-Hours vs Part-Time Employment 2026: Rights, Pay and the New Guaranteed Hours Right
Zero-hours contracts and part-time employment sit at opposite ends of the flexibility spectrum. Zero-hours gives workers variable hours each week and no income guarantee; part-time employment provides fixed contracted hours with all the rights and certainty of permanent employment. The Employment Rights Act 2025 — coming into force in phases from 2026 — introduces a new right for zero-hours workers to request guaranteed hours, materially shifting this comparison. Here is what workers and employers need to know in 2026.
TL;DR - 30-Second Summary
- - Zero-hours: flexible, no guaranteed hours, no minimum weekly income, holiday accrual by hours worked, may affect mortgage eligibility
- - Part-time: fixed contracted hours, statutory rights from day 1 (2026 reform), easier financial planning, holiday entitlement certainty
- - 2026 change: new guaranteed hours right means zero-hours workers can request a part-time contract after 12 weeks of regular work
Side by Side: Zero-Hours vs Part-Time
| Feature | Zero-Hours Contract | Part-Time Employment |
|---|---|---|
| Guaranteed weekly hours | None (until guaranteed hours right kicks in) | Yes — fixed contracted hours |
| Holiday entitlement | 5.6 weeks, averaged over 52-week reference period | 5.6 weeks, pro-rated on contracted hours |
| Sick pay (SSP) | Yes, if earnings exceed LEL in qualifying week | Yes, from day 1 if earnings exceed LEL |
| Maternity/paternity pay | Yes, after qualifying period (26 weeks) | Yes, after qualifying period (26 weeks) |
| Right to request guaranteed hours | Yes — after 12-week reference period (from April 2026) | N/A (already guaranteed) |
| Mortgage lender treatment | Cautious — averaged over 2-3 years | Same as full-time — annualised contracted income |
| Notice period | Statutory minimum (1 week after 1 month service) | Statutory minimum + contractual notice |
| Employment rights | Worker rights (fewer protections) | Full employee rights from day 1 |
What Is a Zero-Hours Contract?
A zero-hours contract (ZHC) is an employment or worker agreement with no guaranteed minimum weekly hours. The employer calls the worker in as needed, and the worker can accept or decline shifts (though in practice declining shifts can lead to fewer future offers). Around 1 million workers in the UK are on ZHCs in 2026.
Workers on ZHCs accrue holiday at 12.07% of hours worked (since a 2023 Supreme Court ruling — though note the 12.07% method is legally challenged; the correct method is to average over a 52-week reference period for anyone with irregular hours). They are entitled to Statutory Sick Pay, Statutory Maternity Pay, and National Minimum Wage — the same rates as other employees — but only for weeks in which they work enough hours to qualify.
What Is Part-Time Employment?
Part-time employment means a contract with fixed contracted hours below full-time (typically below 35 hours/week). Part-time employees have all the same employment rights as full-time employees under the Part-Time Workers (Prevention of Less Favourable Treatment) Regulations 2000.
They receive: a fixed contracted salary or hourly rate, 5.6 weeks holiday entitlement per year (pro-rated for hours), SSP from day 1, eligibility for SMP/SPP after the qualifying period, and notice rights. Holiday is calculated on contracted hours — no ambiguity.
The 2026 Guaranteed Hours Right
The Employment Rights Act 2025 introduces a significant new right: zero-hours workers who have worked regular hours over a 12-week reference period are entitled to be offered a guaranteed hours contract reflecting those hours. Employers cannot refuse without objective justification. Workers can decline the offer and remain on zero-hours if they prefer flexibility.
This right applies from April 2026 (subject to government commencement order). It closes a major gap where workers were effectively working regular patterns but denied the income certainty of a part-time contract. Employers must also give "reasonable notice" of shifts (expected to be 48 hours minimum) under the same legislation.
Tax and Pay Implications
Both zero-hours and part-time workers pay income tax and NI in the same way — based on actual pay received. Zero-hours workers with multiple jobs may find their tax code is not correctly allocated between employers; they should check their tax code applies the personal allowance to their main job only.
National Minimum Wage applies equally: £12.21/hr for workers aged 21+ in 2026/27. Zero-hours workers may earn the NMW equivalent but with fluctuating weekly income, meaning annual earnings can be significantly lower than budgeted.
Mortgage Eligibility and Financial Planning
Most high-street mortgage lenders require evidence of consistent income over 2–3 years. Zero-hours contract income is treated more cautiously: lenders typically average the last 2 years of P60 figures (or 3 months payslips showing a consistent trend). Some specialist lenders will consider full average zero-hours income, but the range accepted varies widely.
Part-time permanent employees are treated the same as full-time employees for mortgage affordability — their annualised income is used straightforwardly. This is a significant practical advantage for part-time workers planning to purchase property or remortgage.
Who Should Choose What?
- - You genuinely value maximum flexibility (student, semi-retired, carer)
- - You have alternative income and want occasional work
- - You are an employer needing fluctuating staffing levels
- - You need income certainty
- - You are the primary income earner in a household
- - You are planning a mortgage application
- - You need reliable holiday entitlement
With the 2026 guaranteed hours right, many workers who were on ZHCs involuntarily will have the option to formalise their typical hours into a permanent part-time contract.