File your company accounts
and Corporation Tax return

Not necessarily. If your company is a micro-entity with straightforward figures, you can prepare and file everything yourself with OneFiler — the tax return, the accounts and the tax computation. You remain responsible for the accuracy of the figures, so if your situation is more complex, we recommend speaking to an accountant.

Yes. OneFiler is HMRC-recognised software for Company Tax Return filing, and files directly through HMRC’s gateway. Recognition means HMRC has confirmed the software can file returns in the required format — it is not an endorsement of any provider over another.

Your company is a micro-entity if it meets at least two of these three conditions: turnover of £1 million or less, total assets of £500,000 or less, and 10 or fewer employees on average. (These are the limits for financial years starting on or after 6 April 2025.) The company must also be a UK company — certain types, such as financial firms and charities, cannot use the micro-entity rules.

Yes — dormant companies are fully supported, with a reduced price for dormant filings. You can prepare and submit a dormant Company Tax Return to HMRC and dormant accounts to Companies House in a few minutes.

Yes, both. OneFiler prepares your accounts for Companies House and your Company Tax Return and tax computation for HMRC, and submits both as part of the same process.

Your company details and registration number, your Corporation Tax reference (UTR), your Government Gateway login for the company, and your year-end figures. If your bookkeeping is in QuickBooks or Xero, you can import the figures rather than entering them manually.

No — that part is handled for you. iXBRL is the digital format HMRC and Companies House require for accounts and tax computations. OneFiler generates it automatically from your figures, so you never work with it directly.

You can see the status of every submission, including any HMRC response, in your dashboard. If a return is rejected, you can correct it and resubmit. Monitoring your submissions and meeting your deadlines remain your responsibility.

Yes. Our application servers are hosted in a UK datacenter (London), and your filing data is stored encrypted in the EU. Your Government Gateway credentials are never stored in plain text, and your HMRC password is deleted as soon as your submission completes. If you connect QuickBooks or Xero, access is granted securely and revoked as soon as your import finishes.

FRS 105 — the accounting standard for micro-entity accounts. OneFiler is built specifically for FRS 105 micro-entity filings.

Those cases are not supported. OneFiler covers straightforward FRS 105 micro-entity returns only — it does not handle Research and Development claims, creative-industry credits, directors’ loans that need the supplementary CT600A pages, or non-resident companies. For any of those, you will need other software or an accountant.

Your Company Tax Return is normally due 12 months after the end of your accounting period. The Corporation Tax itself is usually due earlier — 9 months and one day after the period ends — and your accounts are due at Companies House 9 months after the period ends. Late filing can lead to penalties, so we recommend filing well before the deadline.

No. Every plan is a one-off payment. Pay per filing, or buy the £99 Portfolio if you run up to three companies — there is nothing to cancel and nothing renews.