01Search + pre-fill
Start with the company
Find the company, confirm the accounting period and begin with Companies House details already brought into the workflow.
Coming soon
Keep small company tax on track.
Simple and affordable corporation tax software for UK small companies—prepare CT600 returns and micro-entity accounts without the usual cost or complexity.
Product updates and early-access invitations. No noise.
Product preview
Concept screen- Company
- 2Figures
- 3Review
Northstar Studio Ltd12345678 · Year ended 31 March 2026
Year-end figures
Profit & Loss
Year to
31 Mar 2026Period to
31 Mar 2025
31 Mar 2026Period to
31 Mar 2025
145Turnover
170Interest income
Total income
Cost of raw materials
Staff costs
Depreciation
Other charges
Total expenses
Profit before tax
Accounts & CT600 filing
Easy, intuitive software
From £49 per year
Easy, intuitive process
A focused route from figures to CT600 filing.
Taxrails guides you through the year-end return with clear questions, familiar figures and checks at every step—so preparing company accounts and the CT600 tax return feels straightforward.
02Manual + trial balance
Enter or import figures
Add the profit and loss and balance-sheet figures directly, or bring in a completed trial balance for guided mapping.
03Accounts + CT600
Review both filings
Check the iXBRL accounts and corporation tax calculation together, then follow the Companies House and HMRC steps separately.
Planned feature set
Built for UK small company tax and accounts.
The intended first-release experience is designed around common micro-company year ends, with corporation tax calculations, iXBRL accounts and filing checks kept together. Direct submission remains in development.
Companies House pre-fill
Start from the registered company record and confirm the period before entering the year-end figures.
Two ways to add figures
Enter profit and loss and balance-sheet values manually, or import a trial balance for guided mapping.
Visible tax calculation
Review how the corporation tax result is built, including the treatment of longer accounting periods.
iXBRL micro-entity accounts
Prepare the statutory accounts alongside the CT600, with both documents available to review before filing.
Two filing destinations
Keep Companies House and HMRC status distinct, whether the submissions are completed together or separately.
Checks before submission
Surface missing figures and inconsistencies early, so the return can be reviewed with fewer surprises.
Taxrails explained
CT600 filing software for small companies.
The essentials about preparing a Company Tax Return and micro-entity accounts with Taxrails.
What does CT600 filing software do?
CT600 filing software helps a UK company prepare its Company Tax Return, calculate corporation tax and produce the supporting accounts and iXBRL documents needed for filing.
Will Taxrails help me file a CT600 online?
Taxrails is being developed to take small companies from year-end figures through accounts and CT600 review in one clear process. Direct submission to HMRC and Companies House remains in development.
Does Taxrails prepare micro-entity accounts?
The planned first release is focused on straightforward UK micro-company year ends, including the preparation and review of micro-entity accounts alongside the corporation tax return.
How much will Taxrails cost?
Taxrails is planned to start from £49 per year, giving small companies an affordable alternative for preparing annual accounts and a CT600 tax return.
Early access
Simple tax filing, without the premium price.
Designed for company directors, contractors and accountants handling straightforward UK micro-company year ends.
Taxrails is in development. Joining the waitlist does not create an account.