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Taxley FAQs: filing your CT600 and company accounts
Taxley is online software that prepares a UK limited company's Corporation Tax return (CT600), tax computation and iXBRL accounts, and files them to HMRC when you choose to submit. It suits micro and small companies with straightforward tax affairs, including dormant companies. You pay one fee per return, only when you file, and it covers filing your accounts at Companies House. You remain responsible for the figures.
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What is Taxley?
Taxley is online software for directors of UK limited companies with straightforward micro-entity (FRS 105) or small-company (FRS 102 Section 1A) accounts. It produces the CT600 return, the tax computation and iXBRL accounts ready to file with HMRC, splits periods longer than 12 months into two returns and has dedicated routes for dormant companies and charities, including community amateur sports clubs.
Directors of UK trading, services and property limited companies filing micro-entity (FRS 105) or small-company (FRS 102 Section 1A) accounts. Dormant companies, charities (CT600E) and community amateur sports clubs (CASCs) have dedicated routes, and you can manage several companies from one account. Accountants and agents can also file for clients in agent mode, using their own agent Government Gateway login. Taxley is designed for straightforward cases.
A CT600 return (with CT600E supplementary pages for charities), FRS 105 or FRS 102 Section 1A accounts, and tax computations in inline XBRL (iXBRL), ready to file with HMRC. You can also file the accounts at Companies House from Taxley, at no extra cost. PDF copies of the return, accounts and computation can be downloaded, marked as drafts until the return is filed.
Yes. Companies House accounts filing has been live in Taxley since 28 September 2026, at no extra cost, for micro-entity, small, abridged and dormant accounts. Once the return is paid and the accounts are finished, press “File accounts at Companies House”, using the company's 6-character authentication code. Taxley can also file amended accounts that replace ones it filed there, figures unchanged. It doesn't file confirmation statements, uploaded accounts, other accounts Companies House already has, CIC accounts or some first accounts.
Companies House filing covers the accounts Taxley prepares. Taxley doesn't file uploaded accounts, other accounts Companies House already has, first accounts for a period that doesn't start on the incorporation date, or a community interest company's accounts, which go to Companies House with a community interest company report. The accounts must also end within 7 days of the accounting reference date Companies House holds; if they don't, Taxley can't file them there, and the filing page says what to do (file earlier accounts first, change the date where that's still allowed, or contact support).
Yes, for the tax return: Taxley prepares a CIC's accounts, tax computation and CT600 and files the return to HMRC. Companies House needs a CIC's accounts together with its community interest report (CIC34), so Taxley doesn't file them there directly. Its CIC pack add-on, bought once the return is paid, prepares the CIC34 and a ready-to-upload package, which you upload on Companies House's CIC service, paying Companies House's £15 fee there.
This is common in a company's first year. A Corporation Tax accounting period cannot exceed 12 months, so Taxley splits a long period of account into two accounting periods, time-apportions your figures and prepares two CT600 returns. You enter your figures once, and it is one filing with Taxley, so you pay one fee.
No. The Companies House lookup completes your company details from the public register, and you can upload a trial balance exported from your bookkeeping software as a CSV or Excel (.xlsx) file, which Taxley maps onto the profit and loss account and balance sheet for you to review. When the company has no earlier Taxley return, last year's balance sheet can be filled in from the accounts it filed at Companies House; for the following year, last year's figures come from your previous Taxley return. Your answers are saved as you go.
Yes. You can add several companies to one Taxley account and prepare and file a return for each, paying for each return separately. If you file for clients as an accountant or bookkeeper, use agent mode with your own agent Government Gateway login; the practice portal is built for firms with many clients.
Yes. Use “Help with this return” on your filing page. Your question reaches Taxley support linked to that return, so we know which one you mean, and we reply by email. We can explain how Taxley works, but we can't give tax advice on your circumstances.
Yes — but check what "dormant" means first. For Corporation Tax it means no significant transactions in the period; HMRC may already treat your company as dormant, so a return may not be needed at all (check your correspondence). A company with no income or expenses isn't dormant: it needs a normal return with zero figures — pick your usual business type and enter zeros. Dormant status in Taxley skips the profit and loss step — use only if you genuinely didn't trade. See gov.uk/dormant-company.
What am I responsible for when I file with Taxley?
You remain responsible for the accuracy and completeness of your return, for making the declaration that it is correct, and for paying HMRC on time, normally 9 months and 1 day after the end of your accounting period. Taxley is a software provider that prepares the return from your figures; it is not your accountant or tax agent.
You are. Taxley prepares the return and accounts from the figures you enter, but their accuracy and completeness remain your responsibility as the person filing. You, not Taxley, make the declaration that the return is correct and complete.
You don't need an accountant to file what Taxley supports, but Taxley is software, not advice: check your figures, and ask an adviser about anything you're unsure of. Taxley carries losses forward and sets them against profits for you, and calculates most capital allowances claims for you. It also works out most chargeable gains on UK property and shares bought in one go. It works out section 455 tax on a director's loan that's still outstanding. Group relief between UK companies in a 75% group is supported too. Overseas interest, dividends and rent are supported, with relief for foreign tax. A trading loss can be carried back to the previous 12 months. Terminal loss claims or R&D claims aren't supported yet — Taxley can't file those parts of a return. Taxley is a software provider, not your accountant or tax agent.
No. Taxley is a software provider and only transmits a return when you choose to submit it. If you are an accountant or tax agent, you can use agent mode to file for your clients with your own agent Government Gateway credentials.
No. You remain responsible for paying HMRC by the deadline, normally 9 months and 1 day after the end of your accounting period, and for filing your return on time.
How does filing with HMRC work?
To file, you need your company's Unique Taxpayer Reference (UTR), Government Gateway credentials enrolled for Corporation Tax and your company registration number. Taxley applies the main rate, the small profits rate and marginal relief, carries losses forward, and shows HMRC's response in your account; if a submission is rejected, you can correct it and resubmit.
Taxley files your Company Tax Return (CT600) to HMRC online, using the company's own Government Gateway login, so there is no form to print or post. It also files your annual accounts at Companies House online, live since 28 September 2026, once the return is paid and the accounts are finished. HMRC's response appears on your filing page.
Your company's Unique Taxpayer Reference (UTR), Government Gateway credentials enrolled for Corporation Tax, and your company registration number (CRN). Taxley uses your Government Gateway user ID and password only to send your return and never keeps your password; the user ID is kept, encrypted, in the submission record.
Yes. Taxley applies the main rate, the small profits rate and marginal relief, including adjustments for associated companies and short accounting periods, apportioned across financial years. These calculations are flagged for review and should be checked.
Yes. Taxley carries trading losses, UK property business losses and non-trading loan relationship deficits forward from one Taxley return to the next (or you enter the brought-forward figure) and sets them against profits. You can also claim to set this period's trading loss against the company's other profits of the same period. When a company that isn't in a group uses losses brought forward, Taxley adds the deductions allowance statement (CTA 2010 s.269ZZ) to the computation for you. You can also carry a trading loss back against the profits of the previous 12 months (CTA 2010 s.37); HMRC then repays or sets off the earlier year's tax. Terminal-loss claims are not supported.
Yes, for most claims: the annual investment allowance, the main and special rate pools, full expensing, the zero-emission car first-year allowance and the structures and buildings allowance, worked out from what you bought and sold. Leasing, freeports, the VAT capital goods scheme, partial first-year-allowance elections and non-standard assets still need your own figure.
Yes. If a director or other shareholder owed the company money at the end of the period, you enter the loan account's movements and Taxley works out the section 455 tax, prepares the CT600A pages with the return and claims relief for amounts repaid within 9 months. It checks the loan details before filing and tells you if any part of your case is one it can't file.
Yes. Every return is checked against HMRC's CT600 schema and a set of HMRC's business rules before it is sent, and figures those rules would reject are flagged for you to fix before you pay. You can also run a test with HMRC's test service, which checks the format and figures and files nothing. HMRC checks your UTR and Government Gateway sign-in when you file, not in a test.
You will see HMRC's response in your account. Your prepared files remain available, so you can correct the issue and resubmit, at no extra charge: you don't pay again to send the same return. HMRC's processing, acceptance decisions and service availability are outside our control.
Yes, for a return first filed with Taxley, once HMRC has accepted it. Press “Amend this return” on the filing page, correct the figures and file the amended return, normally within 12 months of the filing deadline. Taxley doesn't amend a return first filed another way. There's no charge for an amendment: amending a return you filed with Taxley is included. It goes to HMRC. If that period's accounts aren't at Companies House yet, you can file them there too. Taxley can also file amended accounts at Companies House, at no extra charge, to replace micro-entity, small, abridged or dormant accounts it filed there that didn't comply; the figures stay as filed, so to correct figures, contact support.
Yes, back to accounting periods that started on 1 April 2020. Profits before 1 April 2023 are taxed at the single 19% rate, and a period that straddles that date is split, with marginal relief on the later part. For those older periods you enter the capital allowances yourself, and the super-deduction isn't claimed.
Yes. You can upload your own iXBRL accounts file instead of Taxley's, and Taxley checks the company number, dates and key figures against your return before filing it to HMRC. Taxley doesn't file uploaded accounts at Companies House, so you file those there yourself.
How does Taxley handle my data and payment?
Personal and identity fields and your generated filings are encrypted at rest, all traffic uses TLS, and you can export or delete your data from the My data page. Tax records are generally kept for six years, in line with HMRC requirements. You pay a one-off fee per return through Stripe, only when you choose to file, and it includes filing your accounts at Companies House.
Taxley is run by Taxley UK LLP, a limited liability partnership registered in England and Wales (LLP number OC461735). Card payments are handled by Stripe: you type your card details into Stripe's own payment form and they go straight to Stripe, not to Taxley. Personal fields and your filings are encrypted at rest, and a return reaches HMRC only when you submit it, using your company's own Government Gateway login.
Personal and identity fields and your generated filings are encrypted at rest, all traffic uses TLS, and an audit trail records account activity with a hashed (never raw) IP address. You can switch on two-step sign-in with an authenticator app and tick “Trust this device for 30 days” on your own browser. You can export or delete your data from the My data page. See our Privacy policy and Security page for details.
A one-off fee per return: £9.50 for a dormant nil return, £39.95 with micro-entity (FRS 105) accounts, or £129 with small-company (FRS 102 Section 1A) accounts. The fee is shown before you pay and charged through Stripe only when you choose to file. The fee also covers filing your company's annual accounts at Companies House — Companies House doesn't charge for this. There is no subscription, and preparing and previewing your return is free.
No. No VAT is charged on Taxley's fees, so the price shown before you pay is the whole price: nothing is added at checkout. The same fee covers filing the return to HMRC and the accounts at Companies House.
Once a return has been sent to HMRC, its fee isn't refundable: the filing has been made, whatever HMRC then decides. If a submission fails because of a fault in Taxley, rather than your figures, your sign-in details or HMRC's systems, you can resubmit at no charge or ask for a refund. Our terms set out the full refund rules.
Tax records are kept in line with HMRC requirements, generally six years from the end of the accounting period. Other data is deleted on request, subject to that statutory retention.
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Which guides explain these answers in more detail?
These pages go further than the answers above: the 30-second check of whether Taxley suits your company, a step-by-step guide to filing a CT600 yourself, Corporation Tax rates and marginal relief, what a loss-making company's CT600 still needs, and whether company equipment is an expense or a capital allowance.
Still have a question?
Our team replies by email, within 1 business day. We can explain how Taxley works, but we cannot give tax advice on your specific circumstances.