The total amount of pay periods within a year is determined by the payroll scheduling you have. Weekly pay schedule means you have 52 pay periods in a year. Biweekly (every two weeks) would give you 26 pay periods, but occasionally you can have 27 pay periods. Semimonthly pay (twice a month, e. g. 15th and 30th) leads to 24 pay periods per year. A monthly schedule has 12 pay periods per year. Every one of these options influences budgeting, payroll processing, and benefit deductions, to such an extent that employers base their choice on administrative convenience as well as employee preference.