Accounting Software for Sole Traders: The Five-Year Problem

From 6 April 2026, HMRC can open an enquiry into your tax affairs and request to see the digital records behind any quarterly submission you have made under Making Tax Digital. That includes records from the very first quarter you filed. If you signed up for accounting software in January 2026, submitted your first quarterly update in April, and then cancelled your subscription in December 2027 because you switched to a competitor, those early records may no longer be accessible. Not because HMRC lost them. Because your software provider deleted them.

This is the five-year problem nobody in the accounting software market is discussing.

What the Five-Year Rule Actually Means in Practice

The MTD record-keeping obligation is not vague. Schedule 3A of the Finance (No.2) Act 2017 and HMRC's subsequent regulations require sole traders to retain digital records of income and expenditure for each tax year, with a minimum five-year window from the submission deadline.

Do the arithmetic. File your 2025-26 return by January 2027 and you must keep those records until at least January 2032. That is six calendar years from now. HMRC also plans to extend MTD to sole traders earning above £30,000 from April 2027, bringing in an additional cohort of tradespeople who have never kept records in this way.

The question nobody asks at the point of signing up for accounting software is this: where will these records live in 2032, and can I still access them?

The Subscription Trap

Accounting software is almost universally sold as a monthly or annual subscription. That model works well for the software company: predictable recurring revenue, no one-off sale to depend on. For you as a sole trader, it creates a structural problem the sales page never mentions.

When you cancel a subscription, what happens to your data?

The answer varies between providers, but the general industry pattern follows one of three models.

Immediate lockout. Your subscription lapses and within days or weeks you lose access to the platform entirely. Your records exist on their servers but you cannot see, export, or use them. Some providers make a final export available for a short window before full lockout; others redirect your login to a billing page.

Paid retention. Historical records remain accessible but you must maintain some level of paid account to view them. In practice, this means you are paying indefinitely for records you already created, simply to remain compliant with a legal requirement. For a five-year obligation, that is five years of subscription fees charged against access to data you generated.

Export and leave. The most user-friendly model: the provider lets you export a full copy of your records in a standard format before you cancel. You keep the file; they delete the originals. This is the right approach, but it relies on you knowing to do it, doing it at the right time, and storing the export somewhere safe for the full retention period.

The problem is that most sole traders only discover which model their provider uses when they actually try to leave.

What an HMRC Enquiry Actually Looks Like

An HMRC compliance check into a sole trader's MTD records is not necessarily a full tax investigation. HMRC can open a routine check of return and request specific records: individual transaction entries, bank statements, receipts. The check can cover any return filed in the previous 12 months, or further back if HMRC suspects fraud or careless behaviour.

Under MTD, those records should exist in your accounting software. If your software is inaccessible because you cancelled your subscription, you face a choice: pay to reactivate it, reconstruct records from bank statements (an expensive process that typically requires an accountant's time), or explain to HMRC why legally required records do not exist. None of those outcomes is comfortable. Penalties for failure to keep adequate records start at £3,000 per tax year and can compound across multiple years if an enquiry covers more than one filing period.

When Would You Actually Cancel?

Cancellation is not only something that happens when you are unhappy with a product. Sole traders cancel accounting software for perfectly ordinary reasons that have nothing to do with dissatisfaction.

Switching to a different product. As MTD-compatible Accounting Software: One Test, 200 Products explains, the market is crowded with HMRC-compatible options. A product you chose in 2024 may be inferior to what is available in 2027. Switching sounds simple; your records are not automatically portable between platforms.

Incorporating as a limited company. Plenty of sole traders cross the threshold where incorporating makes financial sense, typically somewhere between £50,000 and £80,000 of profit. Limited companies need different accounting software, different processes, and often a dedicated accountant. Your sole trader records still need to be retained for five years under the MTD rules that applied when you were self-employed.

Stopping trading temporarily. A sole trader who takes a career break, has a health issue, or pivots to employment does not automatically stop having MTD obligations for the years they were trading. The records still need to exist.

Your provider being acquired. This is the risk that feels remote until it happens. Accounting software for small businesses is a consolidating market. When a large player acquires a smaller one, the smaller product's roadmap, pricing, and data policies can change materially. Users of several well-known small business tools have found their product discontinued or merged into a more expensive tier following acquisition, with a short migration window and no guarantee of the same export terms.

The Questions to Ask Before You Sign Up

Most sole traders choose accounting software based on price, interface, and whether it appears on HMRC's list of compatible products. Those are not wrong criteria. They are just incomplete.

Before you commit to a platform, ask three questions directly, either of the provider's support team or by reading their published terms of service:

1. What format can I export my records in?

A CSV of yearly totals is not a record of individual transactions. HMRC's enquiry process may ask for individual income and expense entries, with dates, categories, and amounts. Your export needs to include this level of detail. PDF reports are the minimum; structured data exports at transaction level are what you actually need. If a provider cannot tell you the export format before you sign up, that is information worth having.

2. What happens to my data if I cancel?

Ask specifically: how long do you have to export after cancellation? Is there a grace period? What happens after that period ends? If the answer is that your data is deleted, that is not necessarily disqualifying, but it means your exit process is time-sensitive and you need to plan for it at the point of signing up, not at the point of leaving.

3. Can I access historical records without an active paid subscription?

If the answer is no, you are implicitly agreeing to pay for the software indefinitely to remain HMRC-compliant. For a five-year minimum obligation, factor that cost in now. Sole Trader Accounting Software: Price It by the Hour makes the case for thinking about software cost in terms of your own time. Add the five-year retention cost to that calculation before you compare monthly prices.

The Format Problem: Not All Exports Are Equal

Even if your provider allows you to export your records, the format matters.

HMRC's enquiry process is conducted by human officers and, increasingly, by automated matching systems that compare submitted figures against third-party data sources. If your records exist only as a proprietary file format that opens only in the software you cancelled, they are not truly accessible. The ideal export format for long-term retention is:

• CSV at transaction level, with columns for date, amount, category, description, and bank reference
• PDF summaries for each tax year, showing income totals, expense totals, and profit figures that match your submitted returns
• Bank reconciliation records showing how each transaction in the software maps to the corresponding bank statement entry

Storing these securely for five years does not require anything sophisticated. A clearly labelled folder, backed up to cloud storage, organised by tax year, is entirely adequate. What is not adequate is assuming they live safely in your software account and will be there in 2031 when you need them.

The Switching Problem: Two Half-Records for One Year

If you switch accounting software mid-year, or mid-MTD-cycle, you will have two sets of records for the same tax year: the first half in platform A, the second half in platform B. At the point of your final declaration, or during an HMRC enquiry, you need both sets to be complete, accessible, and consistent in how they categorise transactions.

Self Employment Accounting Software: The Year-Two Trap identifies the risk of changing approach in year two of MTD. Data portability is part of that risk. If your export from platform A does not include opening balances or use category names that match platform B's structure, you have a reconciliation problem that neither platform will help you solve.

The practical lesson: treat switching accounting software the way you would treat moving accountants mid-year. Document what you had, get a full export before you leave, and switch at a tax year boundary rather than mid-quarter where it can be avoided.

What Good Looks Like

Software that respects your ownership of your own tax records has a few identifiable characteristics. It lets you export transaction-level data at any time, not just at cancellation. It uses open formats rather than proprietary ones. It makes the export process easy to find, not buried three levels deep in account settings. And if records are held on the provider's servers, the terms of service are explicit about what happens to those records when you stop paying.

From the perspective of a sole trader facing five-plus years of MTD obligations, the right question is not which software is cheapest this month. It is which software treats your compliance records as yours.

The alternative is paying indefinitely for access to records you already created, or discovering at the worst possible moment that your five-year requirement cannot be met because a software company deleted your data thirty days after you cancelled a monthly subscription.

The Practical Takeaway

Every sole trader searching for accounting software is solving an immediate problem: get compliant with MTD, keep records, submit quarterly. The five-year obligation feels abstract at the point of sign-up, when the priority is simply getting started.

It is not abstract at the point of an HMRC enquiry three years into your first MTD subscription, when the question of where your 2026 quarterly records actually live, and whether you can still access them, becomes very concrete indeed.

Check the export terms before you sign up. Export your records at the end of each tax year regardless of whether you plan to stay with the same provider. Store them somewhere you control. And if a provider cannot tell you clearly what happens to your data when you cancel, treat that opacity as information.

Your Sole Trader Accounts Are Evidence. Treat Them That Way. The title states it plainly. Evidence that exists only while you pay a monthly fee is evidence with an expiry date.