Global banks will be required to hold Tier 1 capital of nine percent including a 3 percent so-called "conservation buffer", German weekly Die Zeit reported, quoting a draft proposal from the Basel Committee, the body tasked with drawing up global banking rules. Die Zeit's online edition also said regulators can demand banks accumulate a so-called "anti-cyclical buffer" of 3 percent so that Tier 1 capital requirements can rise to 12 percent in boom times. Previously regulators required a Tier 1 ratio of no less than 4 percent.