What is payroll?

Every business that employs people has a payroll — the system through which employees are paid and tax and National Insurance obligations are calculated and reported. Many founders set up payroll for the first time when they take on their first employee, often without fully understanding what the process involves or what errors can cost. Getting it right from the start is considerably easier than correcting historical mistakes.

Payroll is the process of calculating employee pay, deducting Income Tax and National Insurance through the PAYE system, reporting those deductions to HMRC via Real Time Information submissions, and paying employees on a regular schedule. The employer is responsible for calculating the correct amounts, making the submissions on time, and paying over the deductions to HMRC. Payroll also covers employer obligations such as employer National Insurance contributions, pension auto-enrolment, and any statutory payments that may be due.

Payroll errors — underpaying employees, missing RTI submissions, or miscalculating deductions — can result in penalties from HMRC and create significant administrative difficulty to correct retrospectively. Most small businesses use payroll software or outsource payroll to an accountant or payroll bureau to manage this complexity. Our guide to payroll for UK founders covers how the system works and what employers need to do to stay compliant.