RTI for Fewer than 9 Employees – Basic PAYE Tools

Basic PAYE Tools is a free computer software package provided by HM Revenue & Customs (HMRC) to help you run your payroll throughout the year.

The tools are designed for employers with nine or fewer employees and will work out the tax and National Insurance contributions (NICs) for your employees in each pay period and report your payroll information to HMRC.
This guide explains how to make sure you download the latest version of the tools and any updates, what you need to be able to use them and what to do to solve any problems you encounter.

http://www.hmrc.gov.uk/payerti/payroll/bpt/paye-tools.htm