The IT failure on 17 June led to thousands of customers missing their wages, tax credits and disability living allowances.
While the issue was resolved on Wednesday morning, the payments will only go through by the end of the week.
The bank had announced last year that it would invest an extra £750m in strengthening its IT by the end of the current year. However, following the recent glitch, the bank said it knew where it had to invest more.
RBS chief administration officer Simon McNamara was quoted by Reuters as saying: "Technology will on occasion fail. If and when that occurs, we need to ensure we can mask the impact on customers and recover as quickly and effectively as possible. It is important that it is handled well and competently.
"We have a number of people who are working round the clock, using the skills and tools we have acquired to resolve this issue."
Meanwhile, BBC quoted British Bankers’ Association (BBA) CEO Anthony Browne as saying that the incident was unacceptable.
"The banks are already aware of this as an issue. A lot of them have creaking IT systems. They are spending £3bn a year upgrading their IT systems – it is one of the biggest IT upgrades that Britain has ever seen."
Image: RBS said the payments will go through by Saturday. Photo: courtesy of Chandres.
