What accounting do sole traders need to do — and how complicated is it, really? The honest answer is: less complicated than most people fear, but more important than a lot of people realise until something goes wrong.

What ‘Accounting’ Actually Means for a Sole Trader

A lot of people use ‘accounting’ and ‘bookkeeping’ interchangeably, but they’re not quite the same thing. Bookkeeping is the day-to-day recording of money coming in and going out. Accounting is making sense of those records — working out your profit, calculating your tax, filing the right returns.

As a sole trader, you’re responsible for both. You don’t have a finance department. It’s just you — which sounds daunting, but in practice, most sole traders have simpler finances than they think. One income stream, a handful of regular expenses, and an annual Self Assessment. That’s often the whole picture.

What HMRC Legally Requires You to Do

HMRC requires you to register for Self Assessment, file a tax return each year, and pay the Income Tax and National Insurance you owe. You also need to keep records of your income and expenses for at least five years after the relevant tax year’s filing deadline. That’s not negotiable — HMRC can ask to see them.

What those records look like is up to you. A spreadsheet works. Accounting software works. A folder of invoices and a bank statement can work, though it makes life harder than it needs to be. The key is that if HMRC asked you tomorrow to show how you calculated your profit, you could do it without panicking.

Software, Spreadsheet, or Accountant — What Do You Actually Need?

If your income is straightforward and you’re comfortable with numbers, a simple spreadsheet can genuinely be enough in the early stages. Track every invoice you raise, every business expense you pay, and keep a note of what each one was for. That’s the foundation. Everything else builds on it.

Cloud accounting software like QuickBooks, FreeAgent or Xero makes this easier because it connects to your bank and does a lot of the categorising for you. I set clients up on whichever one suits them and show them how to use it properly — so it takes minutes each week rather than a monthly headache. If you’re mixing personal and business spending in one account, that’s worth fixing before anything else. Open a separate business bank account and your record-keeping gets dramatically simpler overnight.

Making Tax Digital — What Sole Traders Need to Know

There’s a significant change coming that every sole trader should be aware of. From April 2026, sole traders earning over £50,000 a year must use Making Tax Digital for Income Tax, which means keeping digital records and submitting quarterly updates to HMRC through approved software. The threshold drops to £30,000 from April 2027, and then to £20,000 from April 2028, according to GOV.UK guidance on MTD for Income Tax.

This isn’t as dramatic as it sounds if you’re already using accounting software. But if you’ve been relying on a shoebox of receipts and filing once a year, it’s a real change to how you’ll need to work. Getting set up on the right software now, before you’re required to, makes the transition much easier. If you’re not sure whether MTD applies to you yet, HMRC will write to those who qualify based on their Self Assessment returns.