Is it a scam filter, a quality mark, or just red tape?
Closest to a helpful directory, honestly. HMRC keeps a public list of "recognised commercial software suppliers" for Company Tax Returns, and it says plainly that it accepts returns filed using any of the products shown. To get on the list, a supplier gives HMRC evidence that its software can produce one or more elements of a Company Tax Return in the form HMRC's systems expect.
So the list answers exactly one question: which suppliers have shown HMRC evidence that their products work? It is a directory to help you choose, not a licence to file and not an endorsement. Your company's legal duty is simply to file the return online in the required format, and HMRC publishes the list to help people find software that can do that. Everything else you care about, like price, quality and fit, HMRC stays completely out of.
What does "recognised" NOT mean?
This is where directors get caught out, so here it is bluntly. HMRC's own list says all of this in its small print:
- It is not a licence to file. The duty on your company is to file its return online in the required format. The list is there to help you find software that can do that, not to grant permission.
- It is not a recommendation. HMRC's exact words: it "is not able to recommend or endorse any one product or service over another". Brilliant and barely usable products get the same flat listing.
- It is not a price check. HMRC does not look at what a product charges.
- It is not a helpdesk promise. If the software goes wrong, HMRC will not support you; its guidance says queries should be taken up directly with the supplier.
- It is not a safety net. HMRC says it "will not be responsible for any loss, damage, cost or expense arising from the use of this software".
- It is not accounting advice. Recognised software puts your numbers into the right boxes in the right format. Deciding what the numbers should be is still your job, or your accountant's, and as a director the responsibility for the filing stays with you.
In short: recognition is about the plumbing, not the product. It tells you the supplier has shown HMRC the pipe connects, and nothing about whether the tap is any good.
Why does this suddenly matter to me?
Because the free route has gone. HMRC's free online filing service closed on 31 March 2026, and from 1 April 2026 a company that files its own Company Tax Return has to use commercial software to do it. So the recognised list is not a new hoop invented to annoy you; it is the directory HMRC publishes to help you with the shopping trip that "filing online" now involves for a self-filing company. Our guide on what the closure means for you covers the detail.
The deadline pressure has gone up at the same time: a Company Tax Return filed even one day late now costs your company £200, so "I will pick a tool later" is a more expensive habit than it used to be.
What is iXBRL, in one sentence?
iXBRL is your company accounts as a normal, readable document with invisible computer labels attached to every number, so HMRC's systems can read the figures automatically. That is the format filing software produces; HMRC's guidance notes that suppliers on its list provide software and services to produce iXBRL accounts and computations. The practical point: pick a tool that produces iXBRL for you and you never need to learn the word. If a tool expects you to tag your own accounts by hand, it is built for accountants, not for you.
Where is HMRC's list, and how do I read it?
HMRC publishes the list under the title "Find recognised commercial software suppliers for Corporation Tax returns", so search gov.uk for that title and open the result on gov.uk itself. Two things to notice when you open it:
- "One or more elements." That phrase is doing a lot of work. A full filing has several parts: the CT600 return itself, the tax calculations behind it, and the iXBRL accounts. A product can be on the list while only handling one of those pieces, so being listed does not mean it does everything you need.
- The "suitable for self-filers" marking. The list flags which products suit a company filing for itself, rather than tools built for accountants running many clients. Start there.
What should I actually check when choosing a tool?
These five checks build your shortlist, and get the wrong product off it:
- The supplier is open about how it files and what it covers. A product you can trust tells you plainly how your return reaches HMRC and which parts of the filing it handles, before you type a single figure. HMRC's directory of recognised suppliers is worth a look while you shop: it shows suppliers who have given HMRC evidence their products work, and it flags which ones suit self-filers.
- It covers everything your filing needs. For most small companies that means the CT600, the tax computations, and the iXBRL accounts, all in one flow. Remember your accounts also have to go to Companies House, which is a separate filing to a separate organisation; check whether the tool handles that too or leaves it with you.
- It is built for self-filers. Look for plain-English wording in the product itself, not screens built for accountants running many clients. If the screenshots are full of jargon, the filing will be too.
- The full price, in pounds, before you start. HMRC will not tell you this, so make the supplier tell you. Watch for subscriptions dressed up as one-off prices, and for add-ons at the checkout.
- You can check every figure before anything is sent. The return goes out in your company's name and the responsibility is yours, so never use a tool that submits without showing you exactly what it is about to send.
One honest extra: if your company's affairs are genuinely complicated, for example group structures or claims you do not fully understand, the right "tool" is an accountant. That is not a failure; for complex companies it is simply the correct answer, and good software will tell you so rather than pretend otherwise.