The deadline is six months after the European Union's June 2021 date for implementing its versions of the rules, showing how Britain is decoupling from EU financial regulations as post-Brexit transition arrangements finish at the end of 2020.

The rules comprise Britain's Investment Firms Prudential Regime, which covers capital requirements for investment firms, and some changes to capital requirements agreed globally by the Basel Committee after the financial crisis a decade ago.

"We have decided to target an implementation date of 1 January 2022 for these two regimes," the Bank of England, Financial Conduct Authority and Britain's finance ministry said in a joint statement.

Britain previously indicated it would introduce the bank capital rules at the same time as the EU, but had not said when it would introduce the investment firm capital rules.

The authorities said the decision to delay was a response to feedback from the industry, which had raised "concerns about the general volume of regulatory reform in 2021."

The delay will be welcomed by investment firms but it pushes back the shift to a simpler capital regime for British companies that EU rivals will benefit from six months earlier, said Ash Saluja, a financial services lawyer at CMS.

"This is a significant example of post-Brexit divergence between the UK and EU regulatory regimes," Saluja said.

The Basel Committee, a global body of banking supervisors that includes the Bank of England, said in March implementing the final leg of its capital rules could be delayed to January 2023. UK regulators have said they will apply this new deadline.

(Reporting by Andy Bruce and Huw Jones; Editing by William Schomberg and Edmund Blair)

By Huw Jones