Workers fork out more than £2,500 a year typically for small purchases such as coffees, breakfast, lunch and snacks, according to a report.
The research for Visa Contactless found that on average, the amount that people who travel to work spend on these small and regular purchases adds up to £10.59 a day.
Over the course of a year, taking weekends and holidays out of the equation, the total bill comes to £2,541, the Working Day Spend Report found.
Despite the significant annual sum, around a third of people said they do not factor this spending into their everyday budgets.
The survey of more than 2,100 commuters from across the UK found they will typically spend £3.69 on a lunch, £2.09 on hot drinks and £7.09 when popping out to the shops during a break to stock up on food and drink for later in the evening.
As people did not necessarily buy all these items during each working day, for example some people may have bought food but no hot drinks, the average amount they spend on a daily basis of £10.59 is a combined average of the total amount people said they spent in each category.
There were also variations across the UK as to whether people turned to cash or cards to make small payments. Just over half (55%) of London workers said they use cash to buy lunch, compared with 81% of those working in Glasgow.
The rise in contactless technology, which allows people to make small payments by swiping a reader with their card, means more than 300,000 terminals across the UK now accept such payments.
People can make payments of up to £20 with this "tap and go" technology without having to enter their PIN.