> ## Documentation Index
> Fetch the complete documentation index at: https://docs.simplifi.work/llms.txt
> Use this file to discover all available pages before exploring further.
# Payroll Rules Engine
The Payroll Rules Engine is Simplifi's logic that your system uses to decide how, when, and how much to pay each person. Simplifi automates this logic by applying the right rule to every timesheet, shift, and contract and allows you to define custom rules and logic for specific events.
Here's an example of a payroll rule that grants a day of annual leave to any staff member who works on a holiday:
