Free Making Tax Digital Software: Who Bears the Risk?

If free making tax digital software goes wrong in April 2026, HMRC will not fine the software provider. It will fine you.

That asymmetry is the single most important thing a sole trader can understand before choosing any MTD-compliant tool, free or paid. The software vendor carries reputational risk. You carry financial risk: late-filing penalties, interest on underpaid tax, and potentially a compliance investigation. The question, then, is not simply whether free MTD software exists. It is who absorbs the consequences when it does not perform as advertised, and whether you have genuinely thought that through.

The Liability Gap Nobody Puts in the Marketing

Every free MTD software product has terms and conditions. Almost none of them are read before sign-up. Buried inside those terms, typically under headings like "limitation of liability" or "disclaimer of warranties," you will find a variation of the same sentence: the provider accepts no responsibility for losses arising from inaccurate submissions, system downtime, or failure to meet HMRC deadlines.

This is not unusual, or even unreasonable. It is standard software licensing language. But it becomes significant the moment a quarterly MTD submission fails to transmit and HMRC issues a penalty point under the new points-based system introduced alongside MTD for Income Tax Self Assessment (MTD ITSA).

Under HMRC's penalty framework, sole traders will accumulate penalty points for each missed quarterly submission. Reach the threshold (four points for quarterly filers) and a £200 fixed penalty applies, with further £200 charges for each subsequent failure. Miss a quarterly deadline because your free tool crashed, lost your data, or simply stopped working after a policy update? The £200 is yours to pay. The software provider's liability? Contractually, close to zero.

What Free Software Actually Promises

Free MTD software comes in broadly three forms, and the risk profile is different for each.

Permanently free tiers from commercial providers

Products like FreeAgent (free for certain bank customers), QuickBooks Simple Start, and similar entry-level tiers are free in exchange for a commercial relationship. FreeAgent, for instance, is free only if you hold a NatWest, Royal Bank of Scotland, or Mettle business account. The moment you switch banks, or the bank changes its partnership terms, the software reverts to a paid subscription. The risk here is dependency: your MTD workflow is tied to a banking relationship you may not want to maintain permanently.

Time-limited free trials

Many providers offer 30 or 90-day free trials ahead of MTD's April 2026 launch. The risk is straightforward: if you build your bookkeeping habits around a trial product and then face a £25-40 per month subscription fee you were not budgeting for, the disruption to your workflow arrives at the worst possible moment, right as quarterly submissions begin. This specific trap is covered in depth in Best Free Software for Making Tax Digital: The Upgrade Trap.

Open-source or charity-sector tools

A handful of open-source projects and nonprofit-adjacent tools claim MTD compatibility. These are genuinely free, but they rely on volunteer maintenance. If a developer moves on, or if HMRC changes its API specifications (which it has done repeatedly during MTD pilots), there is no commercial incentive for anyone to update the software. HMRC's MTD API has gone through multiple versions; a tool built for an earlier specification may silently fail to submit correctly without any error message alerting you.

The Support Vacuum at the Worst Moment

It is 10pm on the 7th of August 2026. Your quarterly MTD submission for the period ending 5 July is due tonight. Your free software is returning an API error. The in-app help points to a FAQ page last updated in 2024. There is no telephone support. The community forum has one unanswered post from someone with the same problem, posted three weeks ago.

This is not a hypothetical designed to frighten you. It reflects the genuine support model of most free software: asynchronous, community-dependent, and unavailable at the moments when sole traders actually need help. Paid products are not immune to this, but commercial providers have contractual and reputational incentives to resolve critical submission failures quickly. A free tool maintained by a small team or sustained by advertising revenue does not.

For a plumber or electrician who spends eight hours a day on site and has precisely thirty minutes in an evening to sort their finances, a support vacuum is not an inconvenience. It is a compliance failure waiting to happen.

HMRC's Own Position on Software Failure

HMRC's guidance is notably unambiguous on this point. In its published information on the MTD penalty regime, the department states that it will consider whether a taxpayer had a "reasonable excuse" for a late or missed submission. Software failure can, in principle, constitute a reasonable excuse, but only if the taxpayer took "reasonable care" to ensure compliance.

In practice, HMRC's definition of reasonable care is demanding. Simply using free software that failed is unlikely to qualify unless you can demonstrate that the failure was sudden, unforeseeable, and that you attempted to resolve it promptly through alternative means. Relying on a tool with known limitations, documented outages, or a history of API compatibility issues would not meet that bar.

This places the burden of due diligence squarely on the sole trader. Before April 2026, you are expected to have selected software capable of meeting your obligations reliably. HMRC will not accept "it was free and I didn't check" as a reasonable excuse.

The HMRC Making Tax Digital Software: The Compatibility Test post covers how to evaluate whether any tool actually meets HMRC's API requirements before you commit.

The Data Portability Risk

Free software has a specific vulnerability that paid alternatives share but at a different intensity: what happens to your records if the product shuts down?

Under MTD, sole traders must retain digital records for at least five years after the 31 January submission deadline for the relevant tax year. If a free tool ceases operation, is acquired, or simply removes your account because you have been inactive, your compliance records could become inaccessible at precisely the moment HMRC requests them during an enquiry.

Some free tools store data locally; others store it in cloud infrastructure funded by venture capital or advertising revenue that may not be sustainable. Exporting your records in a readable, portable format before any transition is essential, and yet export functionality is frequently the first feature to be locked behind a paid tier. The mechanics of this problem are explored in Making Tax Digital Free Software: The Expiry Date Problem.

The Sole Trader Who Earns £60,000: A Concrete Scenario

Consider a self-employed heating engineer turning over £62,000 a year. From April 2026, she falls into the first mandatory MTD ITSA cohort. She signs up for a free MTD tool in January 2026, completes a 30-day trial, and continues on a permanently free tier supported by banner advertising.

By July 2026, she has submitted two quarterly updates. In October, she attempts to submit her third quarterly update for the period ending 5 October. The software has not been updated to reflect a minor change to HMRC's API endpoint. The submission appears to go through on her screen, but HMRC's system rejects it silently. She receives no confirmation email and does not notice. The deadline passes.

One penalty point. In January 2027, the same issue occurs with a different quarterly update. Two penalty points. By April 2027, she has four penalty points and receives a £200 penalty notice from HMRC. She contacts the software provider. Their response, politely worded, directs her to the limitation of liability clause in their terms of service.

The £200 penalty is not catastrophic. The time spent appealing it, the stress of an HMRC letter, and the realisation that her records may contain further errors is. And none of it is recoverable from the software provider.

What Separates Acceptable Risk From Unacceptable Risk

Free MTD software is not inherently dangerous. The risk is manageable if you go in with clear eyes. Here is the framework that separates acceptable from unacceptable risk:

Acceptable: A free tier from a well-funded commercial provider with a clear paid upgrade path, published API compatibility, documented uptime history, and email or chat support with a stated response time.

Acceptable: A free tool used exclusively for very simple sole trader businesses (one income stream, no employees, minimal expenses) where the complexity of submissions is low and the cost of occasional errors is recoverable.

Unacceptable: Any free tool without documented HMRC API version compatibility, with no support channel, or sustained by funding models (advertising, venture capital, banking partnerships) that could evaporate without notice.

Unacceptable: Free tools where data export is locked behind a paywall, leaving your five-year retention obligation dependent on the provider's continued commercial viability.

If you are evaluating specific tools against these criteria, Best Free Making Tax Digital Software: The Fine Print Test walks through the specific contractual terms to examine before committing.

The Question Worth Asking Before April 2026

The framing of the free versus paid MTD software debate is almost always wrong. It treats the decision as a cost comparison when it is actually a risk allocation decision. The right question is not "what does this software cost?" It is "who is responsible when this goes wrong, and can I live with that answer?"

For a sole trader earning £60,000 a year, the annual cost of a reliable MTD app is likely to be between £50 and £200, depending on the provider. Against a potential £200 penalty per compliance failure, plus the time cost of appealing, the maths are straightforward. More importantly, against the risk of an HMRC enquiry triggered by submission irregularities, the maths are not even close.

Free making tax digital software may well be right for your business. But it should be chosen because you have assessed the risk and found it acceptable, not because the word "free" appeared in the heading and you did not read the terms and conditions.

Start by checking your specific submission requirements against any tool you are considering, use the Sole Trader Tax Calculator to understand your actual tax exposure, and ask the provider one direct question before signing up: what is your liability if a submission fails on your platform? The answer will tell you everything.