File your CT600 and company accounts with HMRC
HMRC's free online service for company accounts and tax returns closed on 31 March 2026. Limited companies now need commercial software to file their accounts and Company Tax Return. Ayiza prepares the CT600, the Corporation Tax computation and your accounts in iXBRL, and files them for you.
Ayiza is on HMRC's list of Corporation Tax software suppliers.
Everything HMRC needs, from your bookkeeping
Ayiza turns your bookkeeping into accounts in the format HMRC requires, tagged in iXBRL.
It calculates your Corporation Tax and prepares the computation and the CT600.
Preview the CT600, the accounts and the computation before you submit, and download them as PDF.
Keep your books elsewhere? In bridging mode you use Ayiza just to file the computation and CT600.
Every return you have submitted stays available in Ayiza.
One credit for HMRC and Companies House
A Corporation Tax filing covers the CT600 and accounts to HMRC and your accounts to Companies House.
Compliance plan, no monthly fee: 1 filing £39 + VAT, 5 filings £175 + VAT, 10 filings £325 + VAT, 25 filings £725 + VAT. Credits never expire.
Accounting plan: Corporation Tax filing is included in £39 + VAT per company per month, with a 30-day free trial and no card required.
Frequently asked questions
With commercial software. HMRC closed its free ‘File your accounts and Company Tax Return’ service on 31 March 2026. Since 1 April 2026 companies file their accounts and Company Tax Return with HMRC through software; paper returns are only accepted with a reasonable excuse or in Welsh. See HMRC's guidance.
Yes. HMRC's list of Corporation Tax software suppliers shows that Ayiza produces and submits the CT600, submits iXBRL documents and is suitable for companies that file their own return.
Yes. Ayiza prepares your accounts in iXBRL, calculates your Corporation Tax and files the CT600, the computation and the accounts with HMRC. You can preview all of them before you submit.
Yes. In bridging mode you use Ayiza just to file your Corporation Tax computation and CT600.
Yes. Filing with HMRC does not file your accounts at Companies House. With Ayiza, one filing credit covers the CT600 and accounts to HMRC and the accounts to Companies House.
Yes. A practice can run all its clients as companies in one account and buy filing credits in bulk, down to £29 + VAT a filing.