There was no rush to include a liability levy on banks in this year's budget, John Fraser, secretary to the Treasury has all but told the industry association, refuting much speculation over the origins of a disruptive bank tax measure in this year's federal budget."The levy's inclusion in the Budget followed development as part of normal budget processes," Fraser said in a letter to the Australian Bankers Association yesterday. "Through those processes, careful consideration was given to the design of the levy, the costings and to its effect on the economy as well as the financial sector," Fraser wrote. "This consideration drew on Australia's experience with, and development of, financial sector levies over a number of years and international experience," he said.Fraser noted the ABA's and banks' appeals to obtain modelling information on the levy, but demurred. "As is usual practice we will be providing further relevant information including a regulatory impact statement canvassing the broader economic impacts, compliance issues and revenue estimates as part of the explanatory material accompanying the draft legislation when it is introduced into Parliament."Treasury may have a draft bill ready by late today for further comment.