One of the first questions staff ask when a four-day week is mentioned is also one of the most consequential: will my pay fall?
In the model behind nearly every serious trial to date, the answer is no. The framework is 100-80-100: 100% of pay, 80% of previous time, and a commitment to 100% of previous output. The pay element is not an incidental detail or a generous extra. It is what makes the model a working-time reform rather than a part-time offer with better marketing.
Two different products
A pro-rata pay cut — work 32 hours, receive 80% of salary — already exists. It is called part-time work, and staff who want it can usually request it. Rebadging it as a “four-day week” creates three problems.
First, affordability. The staff who can least afford a 20% income cut opt out, which means your “wellbeing programme” selects for the already comfortable. Hourly-paid and lower-paid staff, who often have the strongest case for more recovery time, are exactly the people excluded.
Second, incentives. A pay cut removes the redesign bargain. When pay is held, leadership has a reason to find waste worth 20% of time: the meetings, reports, approvals and handoffs that consume a day without producing output. When pay falls with hours, nobody has to find anything. The organisation has simply bought less labour, and the difficult questions about how work is organised quietly disappear.
Third, evidence. The wellbeing, retention and recruitment findings leaders like to quote — from the UK 2022 pilot onwards — come from trials that did not cut pay. You cannot import their results into a different model and expect them to follow.
What the pilot record actually shows
In the UK 2022 pilot (61 organisations, around 2,900 staff, reported in February 2023), participating firms kept pay while reducing time, and the reported pattern was wellbeing up, leaving down, and revenue broadly stable during the trial window. The US and Ireland pilots the same year (33 companies) followed the same pay principle. One year after the UK pilot, Autonomy’s follow-up (February 2024) found 54 of the 61 firms still operating a reduced week and 31 on a permanent basis. Keeping pay is part of the treatment those results describe.
A related trap sits with part-time staff. If full-time colleagues move from 40 to 32 hours on the same salary, their effective hourly rate rises by about a quarter. A part-time colleague already working 24 hours on the old hourly rate is now paid notably less per hour for the same work. If you do not address that — usually with a pro-rata uplift to part-timers’ hourly rates — you build a two-tier workforce and a retention problem in the group you can least afford to alienate. Several non-profit cases in the published record raised part-timer hourly rates for exactly this reason.
Deciding pay properly: a short checklist
Write these answers down before the pilot starts, not after the first payroll query:
- Salary is unchanged for the reduced pattern; state this explicitly in the trial terms.
- Leave is expressed in hours, not days, so a holiday week does not quietly gift or steal the day off.
- Overtime, bonus and pension bases are named: on salary, on hours, or otherwise — but named.
- Part-time hourly rates are reviewed against the new full-time hourly rate, with an uplift where the gap would be unfair.
- Promotion and performance processes are monitored for day-off bias; visibility is not a proxy for contribution.
- Clients and staff hear the same sentence: pay is held, time falls, output is committed.
When a pay variation is legitimate
None of this means every shorter-hours arrangement must hold pay. An individual may freely choose part-time work for a pro-rata salary; a firm in genuine distress may negotiate hours and pay together, transparently. What we argue against is presenting pro-rata pay as the four-day week of the trial literature, and budgeting a pilot on the assumption that a pay cut will fund it.
The sentence to retire is “of course pay adjusts.” In the researched model, it does not. Pay held is what forces the honest work: finding the 20% of activity that was never output in the first place. Remove the pay protection, and you have not found that day. You have sold it back.
Sources
- UK four-day week pilot results — Autonomy, University of Cambridge, Boston College and 4 Day Week Global, February 2023.
- UK pilot one-year follow-up — Autonomy, February 2024.
- US and Ireland pilot results — 4 Day Week Global and Boston College researchers, December 2022.
Day5Group is a consultancy that assists in the transition to a 4 day work week. More about Day5Group · All blog articles