Banks will not be allowed to reclassify instruments between trading book and banking book for regulatory arbitrage with the intention of achieving lower capital requirements, according to the RBI's directions on minimum capital requirements for market risk.

The directions, issued on Monday, aim to align the market risk guidelines with the revised Basel III framework, while ensuring simplicity of regulations, and providing flexibility, and ease of adoption.

The directions are applicable to all commercial banks, except small finance banks, payments banks and local area banks.

RBI said the directions will take effect from April 1, 2027, ensuring sufficient lead time for banks.

"A bank shall not reclassify instruments between the trading book and the banking book for regulatory arbitrage, i.e., with the intention of achieving lower capital requirements," the central bank said.

It further said that banks will have to use the simplified standardised approach (SSA) for computing risk-weighted assets for market risk.

The risk-weighted assets will be determined by multiplying the capital requirements calculated under the framework by a factor of 12.5.

RBI also said the specific risk tables for interest rate risk have been revised to align with the Basel Committee on Banking Supervision (BCBS) guidelines, which also provide a more concise and clean treatment.

On debt mutual funds/exchange traded funds (ETF) held in the trading book, it said the capital treatment has been revised to ensure capital computation is based on the underlying risk drivers while ensuring sufficient guardrails.