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HM Revenue & Customs

Company Accounts and Tax Online (CATO)


The Company Accounts and Tax Online (CATO) project set out to digitise and simplify Corporation Tax filing for small businesses known as 'micro-entities' who met a defined set of eligibility criteria. These criteria included factors such as turnover and number of employees.

The project was a joint project with Companies House – allowing users to file their accounts and Corporation Tax Return to both HMRC and Companies House in a single filing.


Upon arrival at the client site, the project was nearing its assessment to allow the service to enter private beta.

Our main objectives were to:

  • · Review all content across the service against the GDS style guide and design principles
  • · Iteratively improve service content through user testing
  • · Incrementally introduce help text to support fields that identified as difficult with users
  • · Review, edit and test micro-content including field labels, error messages and validation prompts
  • · Work with UX designer on content for prototype journeys for forthcoming user journeys

During the contract, we carried out the following work:

  • · Worked across 14 fortnightly sprints to incrementally improve service content
  • · Helped the product successfully pass its assessment into private beta
  • · Introduced new content workflow, allowing content to be pushed to github by content designer
  • · Introduced content design into wider team processes – bringing content and UX onto the scrum board
  • · Supported business analyst in extra workload in writing user stories
  • · Built up relationship between contract designers across London and Newcastle sites

Examples of our work

Expertise required

  • Content design
  • Micro-copy design
  • Copywriting
  • Github
  • JIRA
  • Confluence
  • UX/UI design
  • Rapid prototyping
  • User research
  • Journey mapping
  • Defining of user needs
  • Persona development
  • Writing user stories
  • Gherkin
  • HTML
  • CSS
  • Node.js
  • Javascript