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Company filing

File your company tax return and confirmation statement.

HMRC closed its free filing service on 31 March 2026. Every limited company now needs commercial software to file its Corporation Tax return. We are building it.

See how it worksAsk us a question

Nothing is sent to HMRC or Companies House until you have checked it and said yes.

How it works

Three steps. You are in control of the one that matters.

  1. 1

    Tell us about your company

    Your company number and authentication code, and the figures for the year. We pull what we can from the public register so you are not retyping it.

  2. 2

    We prepare the filing

    We put your figures into the form HMRC and Companies House expect, and check the arithmetic they will check anyway.

  3. 3

    You check it, then we file

    You see every figure and where it came from. Say yes and we send it, then keep the receipt and the evidence for you.

What we file

The filings every limited company has to make, whether it traded or not.

  • Confirmation statement

    The annual CS01 to Companies House, confirming your company details are correct.

  • Corporation Tax return

    Your CT600 and tax computation to HMRC, in the format they now require.

  • Dormant companies

    A company that did not trade still has to file. The same process, with less in it.

  • Your deadlines

    We track them and tell you in good time. Companies House gives you 14 days for a confirmation statement.

One fee per filing, known before you start

You pay when you file, not for a subscription you have to remember to cancel.

What a filing includes

  • The completed form, checked before it goes
  • Submission to HMRC or Companies House
  • The receipt and a record of exactly what was sent
  • Any filing fee the registry charges, shown separately

We are setting our prices now and will publish them here before we take on any company. Ask us and we will tell you what your filing would cost.

Ask what it would cost

Who this is for

Small and micro limited companies filing their own returns.

If you run a limited company you must file a Corporation Tax return and a confirmation statement every year, even if the company did not trade. HMRC withdrew the free tool for this in March 2026, so it now has to go through commercial software.

Bastion Gateway is files company tax returns and confirmation statements.

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