corporation.tax

Coming soon UK companies

Simple and affordable filing for Micro and Dormant companies. UK Corporation tax. CT600 Annual accounts. AA Confirmation statement. CS01

We are currently developing Corporation.tax for UK companies and accountants. Corporation.tax is provided by Deepcircle Ltd, and not affiliated with HMRC or Companies House.

Join the waiting list for early access and special launch pricing.

HMRC's free filing service closed on 31 March 2026. A CT600 now needs software.

Built around what company directors ask for

Corporation.tax is being designed around a focused principle: software for completing tax and company filing obligations should be straightforward to understand and straightforward to use.

  • No accounting knowledge needed

    Plain questions about your company, not accounting terms.

  • Done in one sitting

    Enter your figures once and use them for both the accounts and the tax return.

  • Guided at every step

    Each screen says what is needed and why.

  • Only what your filing needs

    No bookkeeping system to learn first.

  • Priced for a small company

    A focused tool, not an accounting package.

Corporation tax and company filing, made simpler.

Modern software for UK limited companies and accountants to prepare annual accounts, calculate Corporation Tax and complete company year-end filings without the complexity of a traditional accounting platform.

One place for company year-end compliance

Corporation.tax is being built to make the annual filing process clearer, faster and easier to manage.

Planned functionality includes:

  • Annual accounts

    Prepare statutory accounts for eligible UK limited companies and micro-entities.

  • Corporation Tax calculations

    Calculate company Corporation Tax based on the information provided.

  • CT600 Company Tax Returns

    Prepare and electronically submit Corporation Tax returns and applicable supplementary information.

  • iXBRL accounts and computations

    Generate the structured accounts and tax computations required for electronic filing.

  • Companies House filings

    Support relevant company filing obligations alongside the year-end process.

  • For businesses and accountants

    Designed for owner-managed companies as well as accountants and tax agents managing company clients.

Built for UK companies

Corporation.tax is intended primarily for:

  • owner-managed limited companies
  • micro-entities and small companies
  • company directors managing their own compliance
  • accountants and tax advisers
  • agents filing on behalf of authorised company clients

Our initial focus is company year-end compliance, including annual accounts and Corporation Tax.