A staggering new analysis from the Trade Union Congress (TUC) has exposed the scale of exploitation silently plaguing the UK’s workplaces: last year, workers were effectively forced to hand over £28.5 billion of their own wages back to their employers.
While corporations enjoyed the fruits of this free labour, one in eight UK employees—a staggering 3.5 million people—were pressured into working extra hours for absolutely nothing in return. According to the TUC’s findings, the average worker sacrificed £8,100 of their hard-earned pay in 2025 by clocking up an average of nearly seven unpaid hours every single week. In total, the workforce contributed a mind-boggling 1.2 billion hours of labour for which they were not compensated.
“Most workers don’t mind putting in extra hours from time to time to help their team, but that goodwill is being systematically abused. This isn’t a favour; it’s work, and it should be paid for,” said TUC General Secretary Paul Nowak. “Yet last year, millions were denied the money they were rightfully owed.”
While the TUC notes a slight decrease from the £31bn stolen in 2024, the figure remains a damning indictment of an economy built on the backs of overworked and underpaid staff. Nowak warned that this culture of unpaid labour is a ticking time bomb for both workers and the businesses that exploit them.
“Forcing staff into unpaid overtime doesn’t just line the pockets of shareholders at the expense of workers; it destroys people’s health,” Nowak added. “The inevitable result is soaring stress, physical illness, and burnout—which ultimately tanks the productivity and performance these very employers claim to care about.”
A New Era of Enforcement is Coming
Currently, the law allows employers to dodge paying for extra hours, as long as the average pay doesn’t dip below the minimum wage. This loophole has allowed companies to build business models reliant on stolen time.
However, the tide is finally turning. The new Fair Work Agency, established under the hard-won Employment Rights Act, is set to launch next month with a clear mission: to enforce statutory pay and hold greedy employers accountable.
Furthermore, the increased trade union powers introduced under the same Act are a game-changer. They will make it easier for workers to band together, form a union, and collectively challenge unfair treatment, including the rampant issue of unpaid overtime. Solidarity, not individual suffering, is the key to ending this exploitation.
The Hidden Cost of 'Discretionary' Effort
Melissa Carr, a lecturer in international human resource management at Henley Business School, warns that this culture is a false economy that hurts everyone except the executives cashing in.
“For HR leaders, ignoring this isn’t just an ethical failing; it’s a legal and performance risk,” Carr explained. Persistent long hours don't just drain a worker's bank account; they drain their will to live.
“What bosses cynically frame as ‘discretionary effort’ is actually a direct path to high staff turnover and skyrocketing absence costs,” Carr said. She also highlighted that rewarding "presenteeism"—the act of just being at your desk—actively discriminates against carers, parents, and those with responsibilities outside the office.
Carr’s advice to workers is clear: demand transparency. She recommends that HR functions be forced to audit workloads and contractual hours to expose exactly how much free labour is being extracted from their workforce. The days of unpaid overtime being seen as a perk for the employer must end. It is wage theft, plain and simple, and it is time workers got their £28.5 billion back.
Source: CIPD