The average worker spends a sixth of their annual salary on work-related expenses, a study has found.
The research, by Santander, suggests that the cost of going to work is steadily increasing for employees.
In total British employees spend around £91bn of their wages on going to work each year.
The study includes expenses such as childcare, travelling to work and food and drink, but also less obvious expenses such as personal grooming, work clothes, and money spent on colleagues.
Employees said that on average they spent £3,405, or 16pc of an average annual salary, on work-related costs.
The biggest outlay was on commuting, which cost the average employee £1,087, a slight drop from 2014.
Childcare cost the average person £960, an increase from 2014, when it cost £943.
However, one in four people now pay four times this average, with some spending almost £4,000 a year on childcare alone.
Work-related phone bills were surprisingly expensive, costing the average person £240, a very large increase from 2014, when they averaged £187.
While workers have increased spending on colleagues and clients, spending on clothes for work has remained a modest expense, at around £100 a year.
A year's work was £200 more expensive in 2015 than it was in 2014, but the bank's research shows that the biggest leap took place between 2013 and 2014, when employees' costs leapt from £2,681 to £3,218.
On average working was 20pc more expensive last year than it was in 2013.
Barry Naisbitt, chief economist at Santander, said: “With over 31 million people currently working in the UK, employees are of huge value to the economy.
"Not only is this from the output of the work they produce, but also due to the substantial additional contribution they make through work-related products and services, to the tune of £91 billion per year.
"From the money they spend on work clothes to the cost of childcare, employees re-invest a significant amount of the money they earn from work every month.”
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