Cash will be consigned to the scrapheap within 20 years as technology drives new methods of payment, over half of all Britons believe.
Some 52% of people think notes and coins will be out of circulation by 2030, a survey by MyVoucerCodes.co.uk shows.
Iris recognition technology will become a typical method of payment, alongside traditional means such as credit and debit cards, according to 11% of respondents.
Cash already appears to have fallen out of favour, with nearly three-quarters of people preferring to use cards for payments and only 14% saying they would opt for notes and coins.
Of the one in three people who say they rarely carry cash, 47% say it is for security reasons and 82% said it is easier to pay by plastic.
But cash is not as unpopular as cheques - 83% said they had not used one in the last five years.
Farhad Farhadi, personal finance expert at MyVoucherCodes.co.uk, said: "I think it is quite possible that notes and coins could be obsolete within the next twenty years.
"Debit cards were only introduced in the mid-70s and since then paying by plastic has drastically increased in popularity."
MyVoucherCodes questioned 1,938 people during June and July.