File your Corporation Tax
without an accountant
Answer a few questions, review your return, and submit directly to HMRC — all in under 30 minutes.
From £29 · dormant or active · no subscription required
Why directors use OneFiler
Paying an accountant £500+ for a simple dormant return
→ File it yourself for £29 — takes 10 minutes
Chasing your accountant for weeks before the deadline
→ Do it in one sitting, on your schedule
Confused by HMRC's digital filing requirements
→ A simple step-by-step wizard walks you through it
HMRC closed its online filing portal in April 2026
→ We handle the submission for you — just click Submit
How it works
Five guided steps — no tax knowledge required
- 1
Your Company
- 2
Balance Sheet
- 3
Tax Figures
- 4
Review
- 5
Submit
Everything included
One price covers the full filing, start to finish
Annual Accounts
Your balance sheet prepared automatically in the format HMRC and Companies House require.
Tax Return
Corporation Tax return filled in from your figures — no need to understand the form.
Submit to HMRC
Filed electronically in one click. No posting, no portal, no agent.
Companies House
Annual accounts filed at the same time — one fewer thing on your to-do list.
Digital Formats
All the technical formats HMRC requires are generated behind the scenes.
Secure
Your HMRC credentials are encrypted and never stored in plain text.
Is OneFiler right for your company?
OneFiler is for micro-entities — you must meet at least 2 of these 3 criteria:
Simple, transparent pricing
Pay only for what you need. No monthly fees, no surprises.
Dormant Company
File a dormant CT600 and accounts
- Dormant CT600 filing
- Dormant accounts (FRS 105)
- Direct HMRC submission
- Companies House filing
Also included in the Annual Plan
Single Filing
File one CT600 Corporation Tax return
- One complete CT600 filing
- FRS 105 accounts + iXBRL
- Direct HMRC submission
- Companies House filing
Annual Plan
Unlimited CT600 filings for 12 months
- Unlimited filings for 12 months
- Includes dormant filings
- FRS 105 accounts + iXBRL
- Direct HMRC submission
- Companies House filing
- Priority support
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