An employee starts on the 15th. Another takes a week of unpaid leave. A third resigns mid-month. Each one needs a prorated paycheck — and getting the math wrong means overpaying, underpaying, or a compliance headache.
Prorated salary is the proportional pay an employee receives for a partial pay period. It applies only to salaried (monthly-paid) employees. Hourly workers are simply paid for hours worked.
There are three formulas for calculating proration, and no single one is required by law — you choose what fits your organization. If you’re also navigating leave laws in California or other states, consistency in your proration method matters for compliance.
Proration by Calendar Days
Salary is prorated by the number of days in the month, e.g. 30 or 31 days. Weekends and public holidays are included.
Proration by Working Days
Salary is prorated according to the number of working days in the month. Weekends are excluded (but not public holidays).
Example Calculations Harry joined Acme LLC on 8 February 2023. His monthly salary is $5,000. He works normal hours, five days a week.
Calculation by calendar days:
Calculation by working days:
Prorate Salary Easily with Leave Balance
It’s easy to prorate salary for one employee, but what if you have two, three, or more employees coming in (or leaving) at once? And at different pay grades?
Leave Balance’s payroll module handles proration automatically — for new hires, departures, and unpaid leave. All you have to do is check and approve, which frees your HR team to focus on higher-impact work.
Frequently Asked Questions
What is a prorated salary?
A prorated salary is the proportional amount of pay an employee earns for working only part of a pay period. It’s calculated by dividing the full salary by the total days (or working days) in the period, then multiplying by the days actually worked.
When do you need to prorate salary?
Common scenarios include: an employee starting or leaving mid-month, unpaid leave during a pay period, a mid-cycle promotion or pay change, and transitioning between full-time and part-time status.
Which proration formula should I use?
There are three options: calendar days (divides by total days in the month), working days (divides by business days only, excluding weekends), and hourly rate (converts salary to an hourly equivalent). Calendar days is simplest; working days is fairer for employees with mid-week start dates. Choose one method and apply it consistently.
Do I need to prorate benefits too?
It depends on your benefits structure and local laws. Health insurance premiums are typically charged for the full month regardless of start date. Paid time off accrual, however, is often prorated based on the employee’s start date within the accrual period.
Does prorated salary apply to hourly employees?
No. Hourly employees are paid for the exact hours they work, so there’s nothing to prorate. Proration only applies to salaried employees who receive a fixed monthly or annual amount.