Common mistakes included forgetting to cancel subscriptions and accidentally buying apps.
More than one in three people say they made 'silly and avoidable' mistakes with money last year.
A study has found 36% made errors in judgement when it came to spending and saving habits.
The poll of 2,000 people by Comparethemarket.com, found common mistakes included forgetting to cancel subscriptions, accidentally buying apps or booking tickets for the wrong date, according to The Daily Star.