CT600Filing
CT600Filing is online Corporation Tax filing software for UK limited companies and accountancy practices. It guides users through a CT600 return, calculates Corporation Tax as figures are entered, and supports supplementary schedules such as capital allowances and R&D claims. The service generates iXBRL accounts using FRS 102 or FRS 105, or accepts accounts prepared elsewhere, then submits CT600 returns to HMRC and annual accounts to Companies House through their filing gateways. Users can prepare returns before paying, with one-off pricing per accounting period and plan options based on company size; accountant credit bundles are also available. A multi-company workspace provides filing status, deadlines, and submission history for client or group entities. The product runs online without desktop installation and serves company directors, bookkeepers, accountants, and tax professionals handling UK Corporation Tax filings.
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GoSystem Tax RS
Used by the top 100 CPA firms, Thomson Reuters GoSystem Tax RS is the market leader for corporate tax departments. Highly scalable, it can handle your workflow no matter the size of your firm. The software serves clients filing all return types, including multitiered consolidated corporate returns, life insurance returns (including mixed group filings), and tax equalization returns. Because all work is handled online, you’ll pay less in maintenance costs, face fewer storage issues, and rest easy with assured business continuance. Tackle the most complex tax returns, such as multitiered consolidated return processing for corporations and partnerships. Deploy your team simultaneously across a single return so that each specialist can take on their role at the same time. Protect your data with multiple layers of security, including network security, virus protection, encryption schemes, and more.
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UltimateTax
UltimateTax is a professional tax preparation software platform used by tens of thousands of tax preparers annually that centralizes robust tools for preparing, reviewing, and electronically filing U.S. federal and state tax returns while helping practices manage client data, compliance, and office workflows with reliability and support for both cloud and desktop environments. It provides interview-style data entry that guides preparers through client interviews, smart diagnostics to catch potential errors before e-filing, automatic prior-year data carry-forward, form-linking for efficient navigation, and support for all 50 states and a wide range of return types, including individual 1040, corporate, fiduciary, partnership, and other miscellaneous forms. UltimateTax offers multiple product tiers, including Online 1040, Desktop 1040, Pay-Per-Return, and combined 1040 + Corporate packages, so firms of different sizes can choose the workflow that fits them.
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Taxley
Taxley is Corporation Tax filing software for directors of small UK limited companies. Guided, plain-English steps help users prepare a CT600 return, iXBRL accounts and a tax computation online, then file the return with HMRC and the accounts with Companies House. It supports dormant companies, micro-entities, small companies, property and investment-holding companies, charities and CICs, for periods starting as early as April 1, 2020. Preparation is free, and filing is charged per return with no subscription. Accountants can file for clients through the practice portal. Taxley is independent software from Taxley UK LLP, not an accountant.
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