The State Bank of Pakistan (SBP) is the central bank of Pakistan. While its constitution, as originally laid down in the State Bank of Pakistan Order 1948, remained basically unchanged until January 1, 1974, when the bank was nationalized, the scope of its functions was considerably enlarged. The State Bank of Pakistan Act 1956, with subsequent amendments, forms the basis of its operations today. The headquarters are located in the financial capital of Pakistan, Karachi whereas the bank has a fully owned subsidiary with the name SBP Banking Services Corporation (SBP-BSC) which is the operational arm of the central bank and has branch offices in 15 cities across Pakistan, including the capital city, Islamabad and the four provincial capitals and has head office in Karachi. State bank has other fully owned subsidiaries as well namely, I) National Institute of Banking and Finance (NIBAF) which is the training arm of the bank and also provides training to commercial banks, 2) Deposit Protection Corporation (DPC) and recently SBP was given ownership of 3) Pakistan Security Printing Corporation (PSPC) as well.