FreeAgent review: Natively filing UK CT600 and MTD VAT without add-ons

A comparative evaluation of UK cloud accounting tools, analyzing why FreeAgent succeeds at native CT600 filing where market leaders Xero and QuickBooks require third-party integrations.

The answer up front

If you run a simple UK Ltd company qualifying as a micro-entity, FreeAgent is the only mainstream cloud bookkeeping SaaS that lets you file both Making Tax Digital (MTD) VAT and your CT600 Corporation Tax return directly to HMRC without paying for third-party bridging tools. Skip it if your company has complex tax adjustments, capital allowances beyond basic plant and machinery, or if you require advanced multi-currency consolidation. In those complex scenarios, Xero paired with dedicated tax software remains the industry standard.

Methodology

This review evaluates FreeAgent (version observed June 2026) against the requirements of a UK micro-entity Ltd company, drawing on public documentation, HMRC's recognized software developer list, and user reports from online communities including Reddit. We benchmark FreeAgent's native filing capabilities against QuickBooks Online and Xero. This evaluation focuses on the technical workflow of generating iXBRL files and submitting them directly to HMRC via the Government Gateway. We do not cover complex group structures, foreign branch accounting, or manual adjustments for research and development (R&D) tax credits, which typically require dedicated tax suites like TaxCalc or professional accountant intervention.

What it does

Native CT600 generation

FreeAgent automatically populates the CT600 form using your ongoing bookkeeping data. It formats the balance sheet and profit and loss accounts into the required iXBRL format.

Direct HMRC submission

Once the accounts are generated, users authorize FreeAgent to connect to their HMRC Government Gateway account. The software submits both the accounts and the CT600 tax return simultaneously.

MTD compliant VAT filing

For VAT-registered businesses, FreeAgent supports Making Tax Digital. It calculates VAT returns automatically from digital transactions and submits them directly to HMRC.

What's interesting and what's not

What's interesting

FreeAgent's integration of the CT600 workflow directly into the general ledger is a massive time-saver for micro-entities. While market giants Xero and QuickBooks force users to export data to external tax preparation software, FreeAgent keeps the entire pipeline in one place. This eliminates the risk of data mismatch during manual transfers. For founders who self-file, this removes the need to purchase bridging software or a separate tax filing suite like TaxCalc.

What's not

The native CT600 filing feature is heavily restricted. It only supports companies using FRS 105 (micro-entity standards). If your business has complex capital allowances, claims R&D tax credits, or needs to carry back losses to previous years, FreeAgent cannot handle the filing natively. In these scenarios, you must export your trial balance to a dedicated tax suite like TaxCalc or hire an accountant. Furthermore, FreeAgent's inventory management and multi-currency handling are basic compared to Xero, making it less suitable as your business scales.

Pricing

FreeAgent pricing snapshot as of June 2026 for a Limited Company:

• Limited Company Tier: £29/month + VAT.
• Note: This tier is completely free for users who hold an active business bank account with NatWest, Royal Bank of Scotland, Ulster Bank, or Mettle.

Verdict

For UK micro-entities seeking a single, unified platform to handle bookkeeping, MTD VAT, and CT600 filing, FreeAgent is the clear winner. It eliminates the need for expensive bridging software or secondary tax tools. However, if your business model requires complex accounting treatments, you will quickly outgrow its native filing capabilities. In those cases, the combination of Xero and a dedicated tax tool like TaxCalc remains the superior, albeit more expensive, route.

What we'd test next

In future benchmarks, we plan to run a side-by-side filing test using a mock Ltd company with depreciating assets to evaluate how FreeAgent handles capital allowance calculations compared to TaxCalc. We also want to measure the error-handling capabilities of FreeAgent's iXBRL validator when processing non-standard transaction categories.

The investor read

The UK small-business accounting market is highly regionalized due to HMRC's strict regulatory frameworks like MTD and iXBRL filing. While global giants like Intuit (QuickBooks) and Xero dominate on general ledger capabilities, they have historically left tax filing to third-party ecosystems. FreeAgent, acquired by NatWest Group, represents a highly successful regional play that uses native tax filing as a customer acquisition moat, especially when bundled free with business bank accounts. For investors, this highlights a clear trend: in highly regulated tax jurisdictions, general ledger software is commoditizing, and the real value is migrating to end-to-end compliance engines. Startups targeting this space must either build deep localized tax engines or risk being squeezed out by bank-backed free offerings.

Pull quote: “While market giants Xero and QuickBooks force users to export data to external tax preparation software, FreeAgent keeps the entire pipeline in one place.”