File your CT600 and company accounts yourself. Without the accountant's bill.

Your corporation tax return for HMRC and your micro-entity accounts for Companies House, prepared from one set of questions anyone who runs their own company can answer. Built for small UK limited companies with simple affairs. £49 flat once submission opens, covering both filings or either one alone. No subscription.

Prepare your returnHow it works

Takes most companies under an hour. You can stop and come back any time.

Submitting to HMRC is not open yet. HMRC recognises filing software before it can transmit returns, and we are going through that process. You can prepare your return in full and download your CT600, accounts and computations today. Nothing is charged until submission opens, and we will email you the moment it does. If your deadline is close, file by another route.

A miniature clay workshop, the first scene of the film
Watch the filmA company year in sixty seconds, from the workshop to the filed return. Scroll drives the camera.

How it works

1

Find your company

Type your company number and we read your company name, registered office and accounting dates straight from the Companies House register, the same register your accounts are filed back to.

2

Check it fits

A two-minute eligibility check. If your company has anything that needs professional judgement, we tell you up front, before you have typed a single figure.

3

Enter your figures

Turnover, expenses, equipment bought, cash and money owed. Questions you can answer from your bank statements, and the tax computation updates live as you type.

4

Review and file

See your full CT600, your micro-entity accounts and your tax computation exactly as HMRC and Companies House will receive them, then file with your own Government Gateway login.

Built for

  • ✓ Active UK private limited companies (Ltd)
  • ✓ Micro-entity accounts (FRS 105) filed to Companies House
  • ✓ A single UK trade, or a dormant company
  • ✓ Losses brought forward, AIA on equipment, marginal relief

Not for

  • ✕ Groups, R&D claims, property income or chargeable gains
  • ✕ Overdrawn director’s loans (s455 / CT600A)
  • ✕ Companies above the micro-entity size limits

If your company is one of these, you need an accountant, and we will tell you so before you start, not after.

One filing, three documents

A complete company tax return is three things filed together: the CT600 form itself, your accounts, and your tax computation, the last two in HMRC's required iXBRL format. This tool prepares all three from the same answers and files them in one submission.

CT600 return
The corporation tax form, boxes computed for you
Micro-entity accounts
FRS 105 balance sheet, iXBRL-tagged
Tax computation
From your profit to your tax, line by line

Guides

The mechanics accountants rarely explain, each on one page with a worked example.

Loss carry-back: the £10,000 loss that turns into a £950 refund

Made a loss this year but paid corporation tax last year? The claim many small companies never hear about.

Buy a £3,000 espresso machine, deduct £3,000 this year

Depreciation is not tax deductible. The Annual Investment Allowance is what replaces it, and it is usually better.

The corporation tax band nobody puts on a poster: 26.5%

Between £50,000 and £250,000 of profit, every extra pound costs more than either headline rate. How marginal relief works.

Your year end starts three different clocks, not one

Accounts at 9 months, tax money at 9 months and a day, the return at 12. And why Companies House filing does not count for HMRC.

Your first accounts cover more than a year, and that is normal

Where the extra weeks come from, the 18-month ceiling, and why most first-year companies still file only one CT600 rather than two.

Check if your company qualifies

The eligibility check is free and takes two minutes.

Prepare your return