preceding year basis[PYB]

preceding year basis[PYB]　以上年度为基础，上年度评税基期　

In budgeting and other estimates，the practice of using the previous year’s numbers as guidance.For example，if a company’s expenses from salaries were$2million in 2009，it may estimate that they will be in the range of$2million in 2010.However，one may make adjustments to account for changes from the previous year.