# Taxley

> Taxley is UK Corporation Tax filing software from Taxley UK LLP (LLP number OC461735, England and Wales) that lets directors of small limited companies prepare their own CT600 and iXBRL accounts, file the return to HMRC and file the accounts at Companies House.

Taxley at taxley.co.uk is a UK business and is not connected with taxley.com (a US tax-resolution business), Taxly or any other similarly named business.

## What Taxley does

- Prepares the CT600 Company Tax Return (with CT600A for loans to participators, CT600C for group relief, and the full CT600E supplementary pages for charities and community amateur sports clubs), micro-entity (FRS 105) or small-company (FRS 102 Section 1A) accounts and the tax computation in iXBRL. It prepares the accounts and the CT600 from one set of figures, and works out the Corporation Tax from the accounts.
- Files the return live to HMRC using the company's own Government Gateway login. Each return is checked against HMRC's CT600 schema and a set of HMRC's business rules before it is sent, and you can first run a test with HMRC's test service, which files nothing. Taxley never saves your Government Gateway password to your account or filing: you type it each time you file, it is held encrypted while the return is being sent (deleted within three days if sending fails), and the user ID is kept, encrypted, in the submission record.
- Files your annual accounts at Companies House: live since 28 September 2026, for micro-entity, small, abridged and dormant accounts prepared in Taxley, at no extra cost. Once the return is paid and the accounts are finished, you press "File accounts at Companies House" on the filing page; you need the company's 6-character Companies House authentication code. Taxley also files amended accounts at Companies House, at no extra charge, to replace accounts it filed there that didn't comply (revision by replacement): micro-entity, small, abridged and dormant accounts, with the figures as filed. To correct figures, contact support.
- Prepares a community interest company's CIC34 report and a ready-to-upload Companies House package (the Companies House copy of the accounts and the CIC34, as iXBRL in one ZIP) with the CIC pack: £39 for each set of accounts, bought once the return is paid. Companies House doesn't take a CIC's accounts and CIC34 from filing software, so a person files them: by uploading a package like this on Companies House's CIC service, by typing small full accounts into that service, or on paper until 1 April 2028. With the pack, you upload it yourself and pay Companies House's £15 fee for a CIC's accounts and CIC34. The pack prepares the simplified CIC34 only (not the detailed one), and amended CIC accounts go to Companies House by post.
- Applies the main rate, the small profits rate and marginal relief, including associated companies and short accounting periods. It also files returns for older years, back to accounting periods that started on 1 April 2020. Profits before 1 April 2023 are taxed at the single 19% rate (FY2020 to FY2022), and a period straddling 1 April 2023 is split, with marginal relief on the later part. For those older periods the capital allowances are entered, not calculated, and the super-deduction isn't claimed.
- Splits a first period of account longer than 12 months into two accounting periods and prepares two CT600 returns.
- Carries trading losses, UK property business losses and non-trading loan relationship deficits forward and sets them against profits, and carries a trading loss back against the profits of the previous 12 months (CTA 2010 s.37), claimed in the loss-making period's return. When a company that isn't in a group uses losses brought forward, the computation states the company's deductions allowance (CTA 2010 s.269ZZ): £5 million for a 12-month period, less for a shorter one.
- Calculates capital allowances for most claims (the annual investment allowance, main and special rate pools, full expensing, the zero-emission car first-year allowance, and structures and buildings allowance) and chargeable gains for most sales of UK property and shares bought in one go, including indexation and the substantial shareholding exemption.
- Works out section 455 tax on a director's or other participator's loan that's still outstanding, and the relief due when it's repaid. It supports group relief (claims and surrenders) between UK companies in a 75% group, and overseas interest, dividends and property income with double taxation relief for foreign tax already paid.
- Offers a one-page Simple mode for straightforward micro-entity returns, alongside the Advanced step-by-step editor and the box-by-box Full CT600 view, dedicated routes for dormant companies and charities (CT600E), and an agent mode for accountants filing for clients.
- Imports a trial balance exported from bookkeeping software as a CSV or Excel (.xlsx) file (or pasted rows), shows where each account will go, and applies it to the profit and loss account and balance sheet once you have checked it; you can also type the figures in yourself. When a 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.
- Amends a return filed with Taxley once HMRC has accepted it, normally within 12 months of the filing deadline, at no extra charge: amendments of returns filed with Taxley are included. An amended return goes to HMRC. If that period's accounts aren't at Companies House yet, you can file the amended accounts there from the same page. If Taxley already filed them there, it can file amended accounts that replace them, at no extra charge, with the figures as filed; to correct figures, contact support.
- Accepts your own iXBRL accounts file in place of Taxley's, checked against the return before filing to HMRC. Taxley doesn't file uploaded accounts at Companies House; you file those there yourself. You can download PDF copies of the CT600, the accounts and the tax computation, marked as drafts until the return is filed.
- Charges one fee per return, shown before you pay and charged only when you choose to file. The fee also covers filing the company's annual accounts at Companies House, which charges no fee for annual accounts. If HMRC rejects a return, correcting it and sending it again costs nothing extra. Preparing and previewing is free; there is no subscription, and you don't need an accountant to file, though Taxley isn't tax advice and you should review your figures before you file, ideally with a qualified adviser. No VAT is charged on Taxley's fees. A practice account can pay for its clients' returns with prepaid credit packs: micro-entity and dormant returns (with or without accounts) use 1 credit, and an FRS 102 small-company return uses 2 credits.
- Prices per return: £9.50 for a dormant company's nil return, £39.95 for a CT600 with micro-entity (FRS 105) accounts and £129 for a CT600 with small-company (FRS 102 Section 1A) accounts. No VAT is charged, filing the accounts at Companies House is included, and amendments of returns filed with Taxley are free.

## What Taxley doesn't do

- Confirmation statements (CS01): Taxley doesn't file the confirmation statement, so you file it yourself on Companies House's online service. Taxley does file your annual accounts there, except four kinds you file yourself: accounts you uploaded instead of Taxley's, accounts for a period Companies House already has that weren't filed through Taxley, first accounts when the return's period doesn't start on the company's date of incorporation, and a community interest company's accounts, which go with its CIC34 (see the CIC pack above). The accounts must also end within 7 days of the accounting reference date Companies House holds; otherwise the filing page says what to do.
- It doesn't calculate deferred tax, or capital allowances and chargeable gains outside the calculators' scope (for example leasing, freeports and the VAT capital goods scheme; or assets other than UK property and shares bought in one go, sales to someone connected with the company, or reliefs such as rollover) — those still need a figure you work out yourself.
- Not supported: consortium relief and group relief with companies outside the UK; R&D tax relief, creative industry reliefs and the patent box; bed-and-breakfasted director's loans unless repaid entirely by a credited dividend, salary or bonus; overseas branches and controlled foreign companies; terminal loss claims and the temporary three-year carry-back for losses of periods ending between 1 April 2020 and 31 March 2022; losses brought forward used by a company in a group, or above the deductions allowance; charities and community amateur sports clubs (CASCs) that are only partly exempt; quarterly instalment payers, medium-sized or audited companies; intangible assets and special regimes; non-resident companies and companies in liquidation or administration; accounting periods that started before 1 April 2020; VAT returns, Self Assessment and Making Tax Digital for Income Tax.
- It is software, not an accountant or tax agent: it doesn't give tax advice and doesn't pay the company's Corporation Tax.

## Key pages

- [Pricing](https://taxley.co.uk/pricing): the fee per return, which also covers filing the accounts at Companies House
- [How it works](https://taxley.co.uk/how-it-works): the filing workflow step by step
- [Check if Taxley fits your company](https://taxley.co.uk/check): a few quick eligibility questions
- [Corporation Tax calculator](https://taxley.co.uk/corporation-tax-calculator) (main rate, small profits rate and marginal relief) and [Corporation Tax deadline calculator](https://taxley.co.uk/corporation-tax-deadline-calculator) (payment, CT600 and Companies House dates)
- [Free tools](https://taxley.co.uk/tools): free calculators for Corporation Tax, deadlines, late filing penalties and interest, director's loan (s.455) tax and benefit in kind, capital allowances, chargeable gains, company size and long accounting periods; [company car tax (BiK)](https://taxley.co.uk/company-car-tax-calculator), company van tax, [salary vs dividends](https://taxley.co.uk/salary-vs-dividends-calculator), [sole trader or limited company](https://taxley.co.uk/sole-trader-or-limited-company-calculator), company pension contributions, mileage allowance, use of home as office, trivial benefits and dividend reserves; plus an iXBRL accounts checker, each with a worked example and GOV.UK sources
- [Developers and AI assistants](https://taxley.co.uk/developers): the same calculators for AI assistants and code, free and with no key: an MCP server at taxley.co.uk/mcp (Streamable HTTP), a JSON API with an [OpenAPI description](https://taxley.co.uk/api/v1/openapi.json), and embeds for websites
- [Corporation Tax glossary](https://taxley.co.uk/corporation-tax-glossary) (CT600, UTR, iXBRL and other terms) and [CT600 boxes explained](https://taxley.co.uk/ct600-boxes) (what goes in each box of the Company Tax Return)
- [What you can file with Taxley](https://taxley.co.uk/uses): CT600 returns and accounts by filing job, company type and for accountants; [dormant company tax return software](https://taxley.co.uk/dormant-company-tax-return-software): file a dormant company's nil CT600 online, with its dormant accounts at Companies House; [property company tax return](https://taxley.co.uk/property-company-tax-return): CT600 filing for rental property companies
- [Do I need an accountant?](https://taxley.co.uk/do-i-need-an-accountant): a director can file a straightforward company's CT600 and accounts without one; what that costs with Taxley against an accountant, and which returns Taxley doesn't cover yet
- [FAQ](https://taxley.co.uk/faq), [About Taxley](https://taxley.co.uk/about) and [Press & brand](https://taxley.co.uk/press): official descriptions, company facts and logo files

## Guides

- [All guides](https://taxley.co.uk/guides), including [Best CT600 filing software in the UK (2026)](https://taxley.co.uk/guides/best-ct600-filing-software-uk): what a small limited company should check before choosing CT600 software, and how Taxley answers each check; [How much it costs to file a CT600](https://taxley.co.uk/guides/how-much-does-it-cost-to-file-a-ct600): without an accountant, filing costs only the software fee, and Taxley charges one fee per return; and [Companies House software-only accounts filing from April 2028](https://taxley.co.uk/guides/companies-house-software-only-accounts-filing-2028)
- [How to file a CT600 yourself (without an accountant)](https://taxley.co.uk/guides/how-to-file-a-ct600-yourself): the seven steps from your figures to HMRC's acceptance, using commercial filing software
- [What replaced HMRC's free CT600 filing service](https://taxley.co.uk/guides/hmrc-filing-service-closed-choose-ct600-software): the service closed on 31 March 2026, so companies now file with commercial software; Taxley files the CT600 to HMRC and the accounts at Companies House once the return is paid and finished
- [What is a CT600 and how do you file one?](https://taxley.co.uk/guides/what-is-a-ct600-and-how-to-file): the Company Tax Return form, the accounts and computation that go with it, and how a company files them online
- [How to file a dormant company tax return](https://taxley.co.uk/guides/dormant-company-tax-return): a dormant company that gets a notice to deliver files a nil CT600 online through commercial software; Taxley files it to HMRC and any dormant accounts at Companies House once the return is paid and finished; [dormant company tax return filing costs](https://taxley.co.uk/guides/cheapest-way-to-file-dormant-company-tax-return) compares the options
- [Corporation Tax rates and marginal relief 2026/27](https://taxley.co.uk/guides/corporation-tax-rates-and-marginal-relief): how the 19% small profits rate, the 25% main rate and marginal relief apply to a company's profits; [Corporation Tax deadlines: when to pay and file](https://taxley.co.uk/guides/corporation-tax-deadlines-explained): the tax is usually due 9 months and 1 day after the accounting period ends, and the CT600 12 months after it; when accounts covering more than 12 months are split into two returns, both are due 12 months after the end of the accounts
- [How to file CIC accounts and a CIC34](https://taxley.co.uk/guides/how-to-file-cic-accounts-and-cic34): the £15 fee, deadlines, the ZIP package layout, the CIC34 parts, amended accounts on paper and the 1 April 2028 change.

## Company

- Legal name: Taxley UK LLP, a limited liability partnership registered in England and Wales (incorporated 30 September 2026; registered office 27 Old Gloucester Street, London, WC1N 3AX)
- LLP number: OC461735 ([Companies House record](https://find-and-update.company-information.service.gov.uk/company/OC461735)); its members include Taxley Limited (company no. 17299929)
- ICO registration (data protection): ZC263823 ([ICO register entry](https://ico.org.uk/ESDWebPages/Entry/ZC263823))
- Contact: support@taxley.co.uk or [the contact page](https://taxley.co.uk/contact). Official profiles: [YouTube tutorials](https://www.youtube.com/@TaxleyUK), [LinkedIn](https://www.linkedin.com/company/taxleyuk), [Facebook](https://www.facebook.com/taxleyuk), [G2](https://www.g2.com/products/taxley/reviews), [Crunchbase](https://www.crunchbase.com/organization/taxley-ad76), [Chrome extension](https://chromewebstore.google.com/detail/taxley-uk-corporation-tax/mlnmigifoikafhldfcfjlmglglafhfgf)