Royal Bank of Scotland announced on Thursday that it plans to put aside a further $3.8 bn (£3.1bn) to cover the costs of investigations and litigation relating to the issuance and underwriting of toxic US residential mortgage-backed securities during the 2008 financial crisis.
This takes the total amount that the bank has so far set aside to cover litigation by the US Department of Justice (DoJ) to £6.7bn
In Thursday’s statement, RBS said that it continues to cooperate with US authorities in its civil and criminal investigations of RMBS matters.
“The duration and outcome of these investigations and other RMBS litigation matters remain uncertain, including in respect of whether settlements for all or any of such matters may be reached,” RBS said.
"Putting our legacy litigation issues behind us, including those relating to RMBS, remains a key part of our strategy,” said Ross McEwan, RBS's chief executive officer.
“It is our priority to seek the best outcome for our shareholders, customers and employees."
Credit Suisse and Deutsche Bank agreed to pay $5.3bn and $7.2bn to settle their respective mis-selling cases in January.
Taxpayers still hold a more than 70 per cent stake in RBS, following a multibillion bailout in 2008.
The latest move could plunge the bank further into the red.
RBS was the biggest failer in the Bank of England’s annual health check of the UK banking system in November and has embarked on a new plan to bolster its financial strength by £2bn.
The bank is due to announce full-year 2016 results on 24 February.
RBS shares gained 1.9 per cent in early trading in London on Thursday. The stock declined 26 per cent last year.
Barclays' analysts said the announcement is a "step forward" on a long running significant issue, although the final outcome remains uncertain.
"In our view it sets a lower bound for expectations on the ultimate settlement and provides some confidence that the issue will be resolved this year," analysts said.
