The marketing around AI tools for accountants tends to focus on premium products and enterprise licences. What gets less attention is how much is available for free, and whether the free versions are actually any good for day-to-day practice work.
This article is part of Runbook's complete guide to the best AI tools for UK accountants, which covers the full landscape of options at every price point. Here, the focus is specifically on what you can access without spending anything, which free tools are genuinely useful in a UK practice context, and where the free tier runs out of road. If you are not yet sure which tools suit your practice, the free AI Readiness Scorecard gives you a personalised starting point in under five minutes.
What "free" actually means for AI tools
Before reviewing individual tools, it is worth being precise about what free means in this context, because it does not mean the same thing across all products.
Most AI tools offer a free tier that gives you access to a reduced version of the product: fewer features, lower usage limits, an older model, or some combination of the three. In some cases the free tier is genuinely capable for everyday tasks. In others it is primarily a way to experience the product before paying. Knowing which you are dealing with saves time.
There is also a more significant limitation that applies to all free AI tiers and that matters specifically for professional use. Where an AI provider processes personal data on your behalf, a data processing agreement (DPA) or equivalent contractual framework is usually essential. Free plans from the major AI providers generally do not include such terms. But obtaining a DPA through a paid plan is not a complete answer on its own. Your firm also needs to consider the legal basis for processing, data minimisation, transparency and client privacy notices, whether the provider uses inputs for model training or product improvement, data retention, international transfers, sub-processors, access controls, and whether a data protection impact assessment (DPIA) is needed. A paid plan may be the minimum starting point for client data work, but firms remain responsible for their own compliance review.
Data protection rule of thumb: Free AI tools should only be used for internal tasks that do not involve identifiable client, staff or third-party personal data. Do not paste client names, tax references, bank details, payroll data, financial records, meeting transcripts or other identifiable information into a free AI tool unless your firm has reviewed the provider's terms, confirmed the data protection roles, established a lawful basis, checked whether a DPA or equivalent contractual framework applies, and documented the risk. A paid plan may be necessary for client work, but it is not a complete compliance answer on its own. Runbook provides educational content only and does not provide legal, tax or data protection advice. Consult a qualified data protection practitioner for guidance specific to your firm.
Before using any AI tool with client data, check the following:
- Confirm whether the provider acts as a processor, controller or joint controller in your use case.
- Check whether appropriate contractual terms or a DPA are in place with that provider.
- Review or update your client privacy notices to cover AI tool use where relevant.
- Confirm whether prompts, files or outputs may be used for model training or product improvement.
- Check data storage location, retention periods, deletion rights, and international transfer safeguards.
- Review sub-processors and access controls.
- Consider whether a DPIA or internal risk assessment is required.
- Ensure all tax, filing, compliance and client-facing outputs are reviewed by a suitably qualified person before use.
With that framing in place, free AI tools are still genuinely useful. There is a substantial amount of accountancy work that does not involve client data directly: drafting internal policies, summarising publicly available HMRC guidance, preparing internal training notes, structuring reports before adding client-specific figures, and writing procedure documents. For all of these, free tools are a legitimate and capable option.
General-purpose AI assistants: ChatGPT, Claude, and Copilot
These are the three tools most UK accountants are likely to encounter first, and all three offer free access at some level.
ChatGPT Free
ChatGPT Free gives you access to OpenAI's current free-tier model, with usage limits and reduced access to the most capable features compared with paid plans. It handles straightforward writing and drafting tasks well: producing a first draft of an internal procedure note, summarising a document you paste in, answering research questions about tax legislation in plain English, or helping structure a report before you populate it with figures.
The free tier does have meaningful limits. Access to the most capable models and advanced features is more restricted than on paid plans, and usage caps can become noticeable on longer or more complex tasks. There is also no memory across sessions by default, so context you provide in one conversation does not carry to the next. Product features and model access change over time, so firms should check the current ChatGPT plan details before making a buying decision.
For a practice that wants to test whether AI drafting saves time on internal written work before committing to a subscription, ChatGPT Free is a reasonable starting point. Use it for a month on internal documents only, develop a sense of how much time it saves, then make the paid decision with evidence rather than instinct.
Claude Free
Anthropic's Claude is available on a free tier and is worth serious consideration alongside ChatGPT. Claude's particular strength is written communication: the tone of its output tends to be more natural and less generic than many AI tools.
Claude Free typically gives access to Anthropic's current Sonnet-class model, subject to usage limits, availability and periodic plan changes. Daily usage caps apply, and during peak times the free tier can become unavailable. For occasional use or testing, that is manageable. For consistent daily use across a team, the limits become a friction point.
Claude is particularly worth trying for practitioners who find ChatGPT's default writing style too flat. For internal staff briefings, non-confidential template letters, general explanations and draft document structures, its output may need less editing. As with all free AI tools, it should not be used with identifiable client, staff or third-party personal data without a documented data protection review.
Microsoft Copilot
Microsoft's position is more layered than ChatGPT or Claude. Some Copilot chat functionality is available at no additional cost, including web-based Copilot and Microsoft 365 Copilot Chat for eligible business users. For standalone drafting and research tasks, this free access is genuinely capable.
The more valuable practice workflows, such as drafting emails in Outlook, working across Word and Excel, or generating richer meeting outputs in Teams, generally require the paid Microsoft 365 Copilot licence. Availability varies by Microsoft plan, region and admin configuration, so practices should check their current Microsoft 365 licence before assuming a feature is included.
If your practice runs on Microsoft 365, starting with the free Copilot chat access is a practical way to build familiarity with the tool before evaluating whether the paid integration justifies the additional licence cost. The integration substantially changes the workflow, but the free access gives you a genuine sense of the model's capability first.
The AI Prompt Pack for UK Accountants includes 50 ready-made prompts that work with ChatGPT, Claude, and Copilot. Covering client emails, internal documents, tax return letters, and more.
Free transcription and meeting note tools
Meeting transcription is the single most widely adopted AI capability among UK accountancy practices, and there are credible free options in this category.
Otter.ai Free
Otter.ai's free plan gives you 300 minutes of transcription per month, with a cap of 30 minutes per individual conversation. For a practice running one or two client meetings a week, that limit is workable for testing purposes. For a practice with a heavier meeting schedule, it runs out quickly.
The transcription accuracy on clear audio is good, and the tool produces a structured summary alongside the full transcript. For client meetings, firms should not rely only on the fact that the tool is convenient. They should check privacy notices, recording and transcription consent where relevant, provider terms, retention settings, data export and deletion options, and whether appropriate contractual terms are in place before using any transcription tool with client information. The free tier of Otter.ai does not include a DPA. Any meeting notes produced by AI should be reviewed by a suitably qualified person before being relied upon or shared.
As a way to test whether AI meeting notes genuinely save time in your practice before committing to a subscription, Otter.ai Free is a practical option. Run it for two weeks on internal team meetings where no client data is involved, develop a workflow for reviewing and editing the output, and then assess whether the time saving justifies the step to a paid plan.
Microsoft Teams transcription
If your practice runs client meetings via Microsoft Teams, basic transcription is available within the platform at no additional charge on most Microsoft 365 Business plans. The transcription is less feature-rich than Otter.ai, and the AI-generated meeting summary requires the Copilot add-on. However, for straightforward meeting records, the built-in Teams transcription is a useful starting point that many practices are already sitting on without realising it.
Fireflies.ai Free
Fireflies.ai offers a free tier that integrates with video conferencing platforms and produces a searchable transcript. At the time of writing, the free plan includes unlimited transcription, limited AI summaries and 800 minutes of storage per seat. These limits may change, so firms should check the current plan before relying on it for regular practice use. The interface is clean and the setup is straightforward, which makes it accessible for a practice that has not used transcription tools before.
AI features built into accountancy software
One category of free AI capability that accountants often overlook is the AI that is already built into the practice management and accounting software they are paying for.
Xero, QuickBooks, and Sage have all introduced AI-assisted features for transaction categorisation, bank reconciliation suggestions, and anomaly detection. These are not add-ons. They are part of the standard subscription. For practices that are not yet using these features, the first useful action is not to sign up for a new AI tool but to switch on what is already available in the software they use every day.
The AI features in accounting software are purpose-built for accounting data, which gives them an advantage over general-purpose tools for data-heavy work. Because these features sit inside software your firm may already have assessed and contracted for, the compliance review may be simpler than adopting a new third-party AI tool. However, firms should still check the provider's AI terms, data use policies, sub-processors, access permissions, retention settings and privacy documentation before relying on them for client data. This is a lower-friction starting point for AI adoption in your practice, provided the firm has reviewed the relevant terms.
The limitation of these built-in features is scope. They handle what they were designed to handle, which is primarily transactional and categorisation work within the software. They do not help with client communication, internal documents, research, or the broader range of written work where general-purpose AI tools add value.
Practical first step: Log into your Xero, QuickBooks, or Sage account and check what AI features are currently active. Many practices are not using categorisation suggestions or bank feed intelligence that is already switched on by default. Using what you are already paying for is the lowest-effort AI adoption step available to any practice.
Where free tiers fall short for professional use
Free tools are a legitimate starting point, but there are consistent points at which they become insufficient for serious practice use. Being clear about these in advance helps you plan the transition rather than hit the wall unexpectedly.
Data protection and client work
This is the most significant limitation and the one with the most direct professional consequence. Free plans from the major AI providers generally do not include a data processing agreement or equivalent contractual framework. But even moving to a paid plan is not a complete answer. The risk is real, and firms need to understand and document how personal data is processed. A paid business or enterprise plan with suitable contractual terms may be necessary for client work, but it is only the starting point. Firms must still review lawful basis, transparency, security, retention, international transfers, sub-processors, model training or product improvement use, access controls and human oversight before using AI with identifiable client, staff or third-party information. The considerations are covered in more detail in our article on the risks of using AI in accountancy and how to manage them. For advice specific to your firm, consult a qualified data protection adviser.
AI outputs require human review: AI-generated drafts should be treated as working drafts, not advice. Any tax, filing, compliance or client-facing output should be reviewed by a suitably qualified person before it is used. The firm remains responsible for the accuracy of anything sent to clients or submitted to HMRC. AI tools can produce confident-sounding output that is wrong or out of date, and this applies to free and paid tiers equally.
Usage limits and reliability
Free tiers impose caps on usage that become disruptive once AI tools are part of your daily workflow. Running into a daily limit mid-task, or finding the free tier unavailable during a busy period, undermines the efficiency gains you are working to build. For individual experimentation, the limits are manageable. For consistent team use, they are not.
Model quality and context windows
Free tiers typically give you access to a lighter or older version of the model. For simple tasks this difference is not significant. For longer documents, more complex drafting, or tasks that require the AI to hold a lot of context in a single session, the gap between the free model and the paid model becomes noticeable. If you find that the free tool is producing outputs that need a lot of editing, it is worth testing the paid version before concluding the tool itself is not useful.
Prompt quality matters regardless of tier
One limitation that applies equally to free and paid tools is that the quality of the output depends heavily on the quality of the instruction you give the tool. A vague prompt produces a generic response. A specific, well-structured prompt produces a draft that genuinely saves time. This is a skill that develops with practice, and it applies across every tool in this article. The AI Prompt Pack for UK Accountants provides 50 ready-made prompts covering the most common accountancy tasks, which removes the blank-page problem entirely.
Making the most of free tools before you spend anything
The right approach to free AI tools is not to treat them as inferior substitutes for paid products. They are a legitimate way to build genuine competence before committing to a subscription, and in many cases they are sufficient for a significant portion of your practice's AI needs.
Start with internal, non-client tasks
The cleanest use of free AI tools is on work that does not involve client data. Internal procedure documents, staff briefings, training materials, template letters before client details are added, research summaries of publicly available guidance, and draft agenda documents are all tasks where free tools perform well and the data protection question does not arise.
A practical example: a practice manager who needs to write an updated procedure note for the firm's end-of-year accounts process can paste the existing process outline into ChatGPT Free, ask it to produce a clear, step-by-step document in plain English, and have a usable draft in two minutes. That draft needs reviewing and editing, but it removes the hardest part of the task. No client data is involved, and the free tier handles it comfortably.
Build your prompt approach before you pay
Developing a consistent set of prompts for your most common tasks is valuable work that costs nothing and transfers directly to any paid tool you move to. Spend time on the free tier working out what instructions produce useful output for the specific tasks in your practice. By the time you move to a paid plan, you will have a working approach rather than starting from scratch.
Evaluate actual time saving, not potential
The business case for upgrading to a paid plan should be based on actual time saving, not on what you think AI could do in theory. Use the free tier consistently for four weeks on appropriate tasks. Track how long those tasks took before and after. If the saving is clear and consistent, the case for a paid plan is easy to make. If it is not, you have avoided an unnecessary subscription.
If you want a structured approach to this, our guide to how to measure the ROI of AI in your accountancy practice covers the full calculation framework: time savings, tool costs, implementation time, and how to put a pound value on the return. It includes a worked example for a small practice that makes the method concrete.
Know what a paid upgrade actually gets you
Before deciding whether to move to a paid tier, be specific about what changes. For ChatGPT, a Plus subscription gives you reliable access to OpenAI's most capable current model, higher usage limits, and additional features. For Claude Pro, you get access to more capable models with higher daily limits. For Otter.ai, a paid plan removes the monthly minute cap and moves you towards terms more suitable for professional use. Prices and features change regularly, so check each provider's current pricing page before making a decision.
The full comparison of paid and free options at every price point is covered in the complete guide to the best AI tools for UK accountants. For a structured approach to deciding which tools are right for your practice and how to implement them, the AI Implementation Checklist for UK Accountancy Practices covers tool selection, data protection requirements, and a step-by-step rollout plan.
Frequently asked questions
Are free AI tools good enough for accountants?
For internal, non-client work such as drafting internal documents, summarising guidance, or structuring reports, free tiers of ChatGPT and Claude are genuinely capable. The key limitation for professional use is data protection: free plans generally do not include a data processing agreement or equivalent contractual framework, and firms should not use them with identifiable client, staff or third-party personal data unless they have reviewed and documented the data protection position. For client data work, a paid business plan may be the minimum starting point, but firms must still complete their own data protection review. Runbook provides educational content only and does not provide legal or data protection advice.
Can I use ChatGPT Free for accountancy work?
Yes, for internal tasks that do not involve client data. Writing draft emails, summarising publicly available guidance, structuring documents, and researching unfamiliar topics are all appropriate uses of the free tier. You should not input client names, financial figures, tax references, payroll data, or any identifiable information into ChatGPT Free without having reviewed your data protection obligations.
What is the best free AI tool for UK accountants?
ChatGPT Free and Claude Free are the most capable general-purpose options for internal, non-client work. For meeting transcription, Otter.ai's free tier handles up to 300 minutes per month. Microsoft offers some Copilot chat functionality at no additional cost for eligible Microsoft 365 business users, with deeper integrations available on a paid add-on. The right answer depends on what you need the tool to do and what data protection review your firm has completed.
When do I need to pay for an AI tool as an accountant?
When you want to use an AI tool with identifiable client, staff or third-party personal data, a paid business or enterprise plan with appropriate contractual terms may be necessary. However, a paid plan is not a complete compliance answer on its own. Your firm must also review data protection roles, lawful basis, privacy notices, model training use, data retention, international transfers, and whether a data protection impact assessment is needed. Consult a qualified data protection adviser for guidance specific to your firm.
Is Microsoft Copilot free for accountants?
Some Microsoft Copilot chat functionality is available at no additional cost, including web-based Copilot and Microsoft 365 Copilot Chat for eligible business users. The more valuable practice workflows, such as drafting in Outlook, working across Word and Excel, or generating richer Teams meeting outputs, generally require the paid Microsoft 365 Copilot licence. Availability varies by Microsoft plan, region and admin configuration, so firms should check their current Microsoft 365 licence before assuming a feature is included.