Revolut and Monzo lead fraud complaints table

A Freedom of Information request by Which? has found that Revolut and Monzo have emerged as the top banks for fraud complaints filed with the Financial Ombudsman Service (FOS). Revolut received 1,875 complaints, while Monzo had 1,063.

The data is split between authorised push payment (APP) fraud and other scam or fraud complaints.  APP fraud involves a customer being tricked into sending money to a scammer by bank transfer. In contrast, unauthorised fraud involves criminals stealing money by hacking into accounts, using stolen card details and committing identity fraud.

In the 2024 calendar year, Revolut customers referred 3,242 APP fraud complaints to the FOS, while the rest of the top three were made up by Monzo (2,344 complaints received) and Barclays (1,704). The data covering 2025 to date paints a very similar picture, although Monzo and Barclays have switched places.

Monzo has the highest uphold rate of 41% in 2025 – this is the percentage of complaints where the FOS found in favour of the customer, indicating its customers were the most likely to have been wrongly denied reimbursement.

In 2024, the FOS received 2,631 other fraud and scam complaints (not APP fraud) from Revolut customers. The rest of the top three were made up by Monzo (with 1,810 complaints) and Barclays (1,461).

The same firms are set to be the worst in 2025, according to data covering the first eight months of the year. Revolut also has the highest uphold rate of 37% for non-APP scams and fraud.

The table shows the top 10 firms for non-APP fraud and scam complaints referred to the FOS in the first eight months of the year, alongside their uphold rates.

The table shows the top 10 firms for APP fraud complaints referred to the FOS so far in 2025, along with their uphold rates.

Firm	New cases	Uphold rate
Revolut	1,875	30%
Barclays	1,161	31%
Monzo	1,063	41%
HSBC	1,037	34%
Santander	884	27%
Lloyds	883	34%
NatWest	829	35%