The Royal Bank of Scotland Group (RBS) has posted a net loss of £528 million for the first quarter of 2011.
This compares with a loss of £248 million in the first three months of last year.
RBS, which is 84%-owned by the government, reported a first quarter operating profit of £1.053 billion, compared with a profit of £55 million in the fourth quarter of 2010.
This included an Asset Protection Scheme cost of £469 million.