Most sole traders are good at their actual work and find the accounts side genuinely confusing. This guide tells you exactly what HMRC requires, what the new Making Tax Digital rules mean for you, and how to decide whether to manage your books yourself or hand them over to someone who does this every day.

Why sole trader accounting is getting more complicated

Running your own accounts as a sole trader used to mean keeping a spreadsheet and filing one Self Assessment return each year by 31 January. That is still broadly true for many people, but the rules are changing in a way that will affect a large number of sole traders directly and the rest within the next two years.

From 6 April 2026, Making Tax Digital for Income Tax (MTD for IT) requires sole traders with total annual income above £50,000 to use HMRC-recognised software, keep digital records, and send quarterly updates to HMRC. The threshold drops to £30,000 in April 2027 and to £20,000 in April 2028. If your income is approaching any of those figures, the annual tax return you are used to will no longer be enough on its own.

Where sole trader accounts tend to go wrong

The problems I see most often are not caused by dishonesty or negligence. They come from a combination of not knowing the rules and putting the admin off until the pressure of a deadline forces the issue. Both are very fixable, but both become more expensive the longer they are left.

Mixing personal and business money

HMRC does not legally require sole traders to hold a separate business bank account, but using a single personal account for everything creates a significant record-keeping problem. When you come to file your Self Assessment return, you will need to separate every business transaction from every personal one going back up to 12 months. A dedicated business account costs very little and saves a considerable amount of time at year-end.

Not knowing what counts as an allowable expense

HMRC requires sole traders to keep accurate records of all business income and expenses, and those records must be kept for at least five years after the 31 January submission deadline for the relevant tax year. The issue is not usually that people are claiming things they should not. More often, people are under-claiming because they are not sure what is allowable and choose to leave things out rather than risk getting it wrong.

What HMRC actually requires from you

The legal minimum for sole traders is more straightforward than most people expect. You need to keep records of your income and expenses, submit a Self Assessment tax return each year, and pay the Income Tax and National Insurance owed on your profits. From the 2024-25 tax year, cash basis accounting is the default method for sole traders, meaning you record income when you receive it and expenses when you pay them. That approach suits most small businesses and removes the need to track unpaid invoices separately.

1. Register for Self Assessment with HMRC if you have not already done so. You must register by 5 October in the second year of trading, so if you started in the 2024-25 tax year, the deadline to register was 5 October 2025.
2. Keep a clear record of every payment you receive and every business expense you incur. A simple spreadsheet will satisfy this requirement if you are not yet using accounting software, but make sure the records show dates, amounts, and what each entry relates to.
3. Submit your Self Assessment return and pay any tax owed by 31 January following the end of each tax year. If your income crosses the MTD threshold, you will also need to send quarterly updates to HMRC using recognised software such as Xero, starting from the relevant mandation date for your income level.

If you are above or approaching the £50,000 threshold right now, the quarterly reporting requirement under MTD for IT is already live. Xero is HMRC-recognised software that handles quarterly submissions, and I set it up and manage it on behalf of clients across Suffolk so they do not have to think about the deadlines.

What your options actually cost

One of the most common reasons people manage their own accounts is cost. That is a completely reasonable position to take, and for very simple businesses it can work well. The honest comparison below is based on what I see in practice, not on what sounds most persuasive.

What to do if you are starting from where you are now

If you are several months into trading without a clear system, the priority is to stop the gap getting any larger. You do not need to have done everything perfectly from day one. What matters is getting organised from this point forward and making sure your records are accurate enough to file correctly.

• Gather your bank statements for every month since you started trading and identify every payment received and every business-related cost. If you have been using a personal account, go through each transaction and mark it as business or personal. This is time-consuming once but gives you a clean starting point.
• Decide whether you want to manage records yourself going forward or hand them to someone who does it as their job. If you are earning above £50,000 or expect to cross that threshold, you will need HMRC-recognised software regardless of who manages the records. Xero is what I use with every client and I can set it up, connect your bank feed, and train you to use it if you prefer to stay hands-on.